ON MICROSCOPIC DISCOVERY. 



637 



mouth divided into two parts and set with small 

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

 serita. Somewhat cone-ehaped, the aperture set with 

 spines, the tail short and divided into two points. 69. 

 VoriicMa lacinulata. Like an inverted cone, the aper- 

 ture lobated, the tail small and furnished with two 

 bristles. 40. Vorticella constrida. Elliptical, ventricose, 

 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. 1'2. Vorticella Umqueta. 

 Long, flat, the tail formed of two ver^ long bristles. 

 43. Vorticella rotatoria. Cylindrical, with a little organ 

 projecting from the neck, and a long tail furnished with 

 four points. 44. Vorticella furcuta. 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 canicida. Cylindrical, 

 the aperture plain, with a short articulated tail divided 

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

 cal, beardless, with the tail terminating in two long 

 spines. 18. Vorticella, stentorea. Long-tailed, trumpet- 

 shaped, the arms furnished with rows of short hairs. 



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



50. Vorticella ftosculosa. 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. Vorticella rinqens. 

 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 vaijinata. Simple, 

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

 tained in a sheath. 57. Vorticella ylobularia. 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 

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

 0'2. Vorticella annularis. Simple, truncated, with a 

 pedicle twisted at the end. 63. Vorticella acinosa. 

 Compound, with ciliated globous naked florets, and an 

 umbellated stem. (>'4. 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 bMis. Simple, 

 hemispherical, witli a margin, which it can contract at 

 pleasure. 67. Vorticella yemella. Simple, spherical, 

 with a double head. 68. Vorticella pip-aria. Com- 

 pound, with beardless oval florets, two double arms 

 the stem branched. 6.9. VorticeHa anastatica. Described 

 70. Vorticella digitalis. Described .7 1 . Vorticella poly- 

 pina. Compound, oval truncated, with a bending 

 branching stalk. 72. Vorticella racemosa. Compound 

 rigid pedicle, with small branched long feet. 73. For 

 ticella cyathini. Described. 



XVII. BRACHIONUS. A worm capable o! 

 contracting, covered with a shell, and furnishec 

 with rotatory cilia. 



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

 curious little creature, with two long bristle. 

 in front, like the antennae of an insect." 



Plate 27, fig. 23. Brachionus Baker i. Thi 

 general characteristics of this creature are a 

 follows: the shell ventricose, four teeth a 

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

 tail terminating in two short points. Frorr 

 each side of the shell there is a curved pro 

 jection, inclining towards the tail. Thi 

 upper part of the shell has in general fou 



onger spiculae, and two shorter ones. From 

 he head, two arms or branches are frequently 

 xtended ; the circular end of each is furnished 

 ivith a tuft of little hairs, which sometimes 

 move in a vibratory manner, at other times 

 Have a rotatory motion. The eggs are either 

 iffixed to the tail, or the curved part of tlie 

 hell ; they have from one to five hanging 

 Vom them. 



BRACHIONUS SPECIES. 



1. Brachionus striatus. Univalve, the shell oval and 

 triated, six notches or teeth round the upper edge, 

 he base whole or even, without a tail. 2. Brachtonus 

 mia.rn.ula. 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- 

 ium. 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. ti. 

 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. 1 0. Brachionus plicatilis. Uni- 

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

 base notched. 1 1 . Brachionus ovalis. 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. Brachwnui 

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

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

 spines. 1 4. Brachionus mucronatus. Bivalve, something 

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

 consisting of two spines. 15. Brachionus unanatu*. 

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

 pointed, two thick bristles for the tail. 16. Brachionus 

 cirratus. Ventricose, somewhat pellucid, the head 

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

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

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

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

 horns proceeding from the base, and no tail. 19. Brack 

 ionus impressus. Capsnlar, 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. Brachwnvs 

 Bateri. Described. 22. Brachionus patulus. Capsular, 

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

 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 



