ON MICROSCOPIC DISCOVERY. 



637 



mth divided into two parts and set with smnll 

 spines, a point projecting from the tail. 38. Vortiaeua 

 serita. Somewhat cone-shaped, the aperture set with 

 spines, the tail short and divided into two points. 39. 

 Vorticella lacinulata. Like an inverted cone, the aper- 

 ture lobated, the tail small and furnished with two 

 bristles. 40. Vorticella constricta. Elliptical, ventricosc, 

 the mouth undivided, the tail annulated and forked. 

 41. Vorticella togata. Square, the aperture not divided, 

 the tail consisting of two long spines, which occasion- 

 ally unite and appear as one. 42. Vorticella lonf/iseta. 

 Long, flat, the tail formed of two very long bristles. 

 43. Vorticella rotatoria. Cylindrical, with a little organ 

 projecting from the neck, and a long tail furnished with 

 four points. 44. Vorticella furcata. Cylindrical, the 

 aperture undivided, the tail rather long, and divided 

 into two parts. 45. Vorticella catulus. Cylindrical, the 

 aperture plain, the tail short, bent back, and divided 

 into two points. 46. Vorticella canicula. Cylindrical, 

 the aperture plain, witli a short articulated tail divided 

 into two pointed parts. 47. Vorticella felis. Cylindri- 

 cal, beardless, with the tail terminating in two long 

 spines. 48. Vorticella stentorea. Long-tailed, trumpet- 

 shaped, the arms furnished with rows of short hairs. 



49. Vorticella socialis. Bearded, thick, and wrinkled. 



50. Vorticella Jlosculosa. An aggregated tail, oval-shaped, 

 with a dilated pellucid disc. 51. Vorticella citrina. 

 Simple, many-shaped, with an orifice admitting of 

 contraction, and an equally sized foot-stalk. 52. Vorti- 

 cella piriformis. Simple, oval, with a very short, retrac- 

 tile foot, which it can draw within itself. 53. Vorticella 

 tuberosa. Simple, the upper part broad, the under part 

 small, with two projections at the anterior end, fur- 

 nished with a number of fibrilla. 54. Vort-icella rin<;ens. 

 Simple, somewhat oval-shaped, with a small pedicle, 

 and an orifice which it contracts or dilates. 55. Vorti- 

 cella inclinans. Simple, bent, with a short pedicle, and 

 small retractile head. 56. Vorticella vayinata. Simple, 

 erect, shaped like a truncated egg, the pedicle con- 

 tained in a sheath. 57. Vorticella owbularia. Simple, 

 spherical, with a twisted pedicle. 58. Vorticella lunaris. 

 Simple, hemispherical, with a twisted pedicle. 59. 

 Vorticella convallaria. Described. 60. Vorticella nutans. 

 Simple, with a twisted turbinated pedicle. 61. Vorticella 

 ncbulifera. Simple, egg-shaped, the pedicle bent back. 

 62. Vorticella annukiris. Simple, truncated, with a 

 pedicle twisted at the end. 63. Vorticella acinosa. 

 Compound, with ciliated globous naked florets, and an 

 umbellated stem. 64. Vorticella fasciculata. Simple, 

 green, bell-shaped, the margin or edge turned back, the 

 pedicle twisted. 65. Vorticella hians. The head re- 

 sembling a citron, the apex truncated, the base narrow ; 

 a gaping cleft is observable descending from the apex 

 to one- third of the body. 66. Vorticella bellis. Simple, 

 hemispherical, with a margin, which it can contract at 

 pleasure. 67. Vorticella ffemella. Simple, spherical, 

 with a double heiid. 68. Vorticella pyraria. Com- 

 pound, with beardless oval florets, two double arms, 

 the stem branched. 69. Vorticella anastatica. Described. 

 70. Vorticella digitalis. Described. 1\ .Vorticella poly - 



e'na. Compound, oval truncated, with a bending, 

 anching stalk. 72. Vorticella racemosa. Compound, 

 rigid pedicle, with small branched long feet. 73. Vor- 

 ticella cyathini. Described. 



XVII. BRACHIONUS. A worm capable of 

 contracting, covered with a shell, and furnished 

 with rotatory cilia. 



Plate 35, fig. 53. Brachionus passus. " A 

 carious little creature, with two long bristles 

 in front, like the antennae of an insect." 



Plate 27, fig. 23. Brachionus Baheri The 



general characteristics of this creature are as 

 follows: the shell ventricose, four teeth at 

 the apex, two horns at the base, and a long 

 tail terminating in two short points. From 

 each side of the shell there is a curved pro- 

 jection, inclining towards the tail. The 

 upper part of the shell has in general four 



.longer spiculas, and two shorter ones. From 

 the head, two arms or branches are frequently 

 extended ; the circular end of each is furnished 

 with a tuft of little hairs, which sometimes 

 move in a vibratory manner, at other times 

 have a rotatory motion. The eggs are either 

 affixed to the tail, or the curved part of the 

 shell ; they have from one to five hanging 

 from them. 



BRACHIONUS SPECIES. 



I. Brachionus striatus. Univalve, the shell oval and 

 striated, six notches or teeth round the upper edge, 

 the base whole or even, without a tail. 2. Brachionus 

 squamula. Univalve, shell orbicular, the apex, trun- 

 cated, and having four teeth, the base smooth, no tail. 

 3. Brachionus pala. Univalve, with an oblong exca- 

 vated shell, four long teeth at the apex, the base 

 smooth, no tail, the colour yellow. 4. Brachionus bipa- 

 lium. Univalve, the shell oblong and inflected, ten 

 teeth at the apex, the base smooth, and a spurious tail. 

 5. Brachionus patina. Univalve, shell orbicular, the 

 edges regular, and having a long beardless tail. 6. 

 Brachionus clypcatus. Univalve, the shell oblong, the 

 apex notched, the base smooth, and the tail naked. 

 7. Brachionus lamellaris. Univalve, the shell extending 

 considerably beyond the body ; the base divided into 

 three small horns, with two hairs at the end of the 

 tail. 8. Brachionus patella. Univalve oval shell, two 

 teeth at the apex, the base notched, two bristles at 

 the tail. 9. Brachionus bractea. Univalve, shell rather 

 orbicular, lunated apex, smooth base, and the tail fur- 

 nished with two spines. 10. Brachionus plicatilis. Uni- 

 valve, with an oblong shell, the apex hairy, and the 

 base notched. 11. Brachionus oralis. Bivalve, with a 

 flattened shell, the apex notched, a hollow part at the 

 base, the tail formed of two tufts of hairs. 12. Brach- 

 ionus tripos. Bivalve, the apex of the shell beardless, 

 three horns at the base, and double tail. 13. Brachionus 

 dentatus. Bivalve, with an arched shell, the apex and 

 the base are both toothed, and the tail formed of two 

 spines. 14. Brachionus mucronatus. Bivalve, something 

 of a square form ; the apex and base pointed ; the tail 

 consisting of two spines. 15. Brachionus uncinatus. 

 Bivalve, with an oval shell, the apex even, the base 

 pointed, two thick bristles for the tail. 1 6. Brachionus 

 cirratus. Ventricose, somewhat pellucid, the head 

 conical, with a bundle of hairs on both sides ; it has 

 also a rotatory organ. 17. Brachionus paswts. De- 

 scribed. 18. Brachionus quadratus. Capsular, in a quad- 

 rangular shell, with two small teeth at the apex, two 

 horns proceeding from the base, and no tail. 19. Brach- 

 ionus impressus. Capsular, the shell quadrangular, a 

 smooth undivided apex, obtuse base, notched margin, 

 and a flexuous tail. 20. Brachionus urceolaris. Single, 

 with a short tail, and toothed mouth. 21. Brachionus 

 Bakeri. Described. 22. Brachionus patulus. Capsular, 

 shell ventricose, eight teeth at the apex, the base lun- 

 ated or hollowed into the form of a crescent, and fur- 

 nished with four horns ; the tail short, with two small 

 points at the end. 



In closing this brief account of the Infus- 

 oria, we would again call the attention of 

 microscopists to the propriety of merging ap- 

 parently special differences into one individual, 

 by attentively noting the successive changes 

 which each creature undergoes. From our 

 own observation we are convinced that noth- 

 ing more is required than a good instrument, 

 extensive leisure, and considerable patience, 

 to enable the philosophical inquirer to simplify 

 the Infusorial arrangement : that this is a 

 desirable object for attainment none will deny, 

 except those who are so enamoured of system- 

 atic complexity, that they delight in nothing 



