DESCRIPTIOX OF THE EXG RAVINGS. 963 



at c represent the earliest stage of the spermatic particles; those at a the mature, including 

 the rod-like particles. 31. The maxilhe of Asplanclma Sieboldii ; the striated muscular 

 bands moving them are very distinct. 32. The female of Asplanchna Sieboldii : a, 

 pharynx ; h, cells of stomach ; c, horseshoe-shaped ovary ; d, saccular or uterine portion 

 of oviduct, or ovarian sac, with contained mature ovum ; e, contractile vesicle ; j\ tags of 

 water-vascular canal ; k, ditto ; g, muscular (?) cushion witliin ciliary wreath supporting 

 spines. 



PLATE XXXYIII. (Rotatoria). 



Figure 1. Rotifer inflatus, body extended ; rotary apparatus withdrawn. 2, Tlie 

 same Eotifer, with the horn-like appendages of its rotary apparatus expanded. 3. The 

 same Rotifer, strongly contracted into a globular form. 4. Pliilodina erythrophthalma, in 

 a contracted condition, as found when di-ied. 5. Euchlanis triquetra, viewed on the under 

 side: a points to the lining membrane of the lorica in wliich the muscles are inserted; 

 h, muscles ; c, ganglionic enlargement ; d, respiratory tube ; c, areolar tissue of head ; 

 /, oesophagus, or tube between maxillary head and stomach. 6. Anursea heptodon. 7. 

 Bracliionus rubens, the young just emerged from the shell. 8-10. B. Bakeri: 8. Young 

 from the Qgg\ 9. Summer Qg^^\ 10. Winter egg. 11, Notommata centrura, a portion of 

 the respiratory tulDe, with the ciliary tags witldn. 12. Termination of a tag, with the 

 cilium witliin. 13. A portion of a water-vascular canal, with ciliated tags of Asplanchna 

 Sieboldii. 14. Diagram of head of Brachionus polyacanthus, viewed from the mouth 

 side. 15. Diagram of head of the same, viewed from above. 16. A portion of the cerebral 

 ganglion and of the nerves proceeding from it, and the eye consisting of two portions. 

 17. Eye of Brachionus Bakeri, detached. 18. Eye of Euchlanis unisetata. 19. Eye of 

 Caligus. 20. Diagram of head (trochal disc) of Philodina. 21. Diagram of same, viewed 

 from the mouth side. 22. Rattulus carinatus. 23, 24. Salpina spinigera. 25. Noteus 

 quadricornis, dorsal view : «, maxillre ; c, anterior spinous cornu of lorica ; c c, posterior 

 cornu ; d, ovary ; /, vesicle of water-vascidar system ; e, canal of ditto ; h, stomach ; 

 2, muscles. 26. Notommata centrm'a, dorsal view, suiTounded by a mucous external 

 envelope, and hned by a subtegumentary lamina or dermis : /j, antenna ; c, glandular sac 

 around oesophagus ; d, elongated process of rotary organ, called the under lip ; c, tags of 

 respiratory canal ; /, stomach, with large glandular cells of its wall ; g, intestine ; h, ]3an- 

 creatic glands ; i, vesicle of water- vascular or respiratory system ; k, cerebrum ; I, canal of 

 respiratory tube surrounded by a granular coat ; o, ovary ; p, ovum ; n, muscular bands ; 

 q, chitiuous lining of oesophagus ; r, transverse muscles. 27. Bracluonus Bakeri : a, lorica 

 or carapace ; b, posterior horns ; c, anterior horas ; f/, lobes of trochal disc ; e, siphon or 

 antenna ; /, gastric canal or oesophagus ; g, convoluted respiratory tube ; /, pancreatic 

 glands. 28. Asplanchna priodonta: a, longitudinal muscles; h, oesophagus; c, stomach; 

 d, ovary ; e, pharynx. 29. Pterodina Patina, foot not showii : a c, convolutions of respi- 

 ratory canal ; b, longitudinal striated muscles. 30. Polyarthra platyptera : a, ciliated 

 tubercular processes of head ; c, compound feathery processes used as locomotive organs ; 

 d, mature ovum adherent externally ; m, striated longitudinal muscles. 31, 32. Poly- 

 chretus subquadratus. 33. Maxillae of Notommata vermicularis. with the red eye, con- 

 sisting of two portions (a). 34. Maxillae of Hydatina senta. 35. Maxiilas of Albertia 

 vermicularis. 36. Albertia vermicularis, x2(X). (Figured after Dujardin, Huxley, Leydig, 

 and Party.) 



PLATE XXXDL (Rotatoria). 



Figures 1-3. Lindia torulosa: 1. Rotary organ retracted; 2. Dental apparatus of 

 ditto; 3. Rotary organ expanded. 4-7. Euchlanis dilatata: 4. Female, lying on its 

 back, abdomen upwards ; 5. Male, lying on its back ; 6. The granular heap from a yoimg 

 male; 7. Male, lying on its abdomen. 8, 9. Notommata parasita (Ehr.): 8. Male; 

 9. Female. 10-20. Brachionus urceolaris : 10. A summer ovum in the act of fission ; 

 11. The embryo escaping from a summer egg, with ruptm-e of shell ; 12. A young male 

 after its escape from the egg ; 13. A male escaping from tlie egg ; 14. A young male, 

 older than fig. 12 ; 15. Female, rotary organ fully expanded ; 16. Female, with four male 

 eggs in dift'erent stages of development attached ; 17. Female, rotary organ retracted, 

 tentacular process (calcar) protruded; 18. Female, lateral view; 19. Maxillary bulb 

 (mastax), with teeth in position ; 20. A winter, ephippial, or lasting ovum. 21-24. Bra- 

 chionus militaris : 21. Female, lying on its back ; 22. Female, lying on its abdomen ; 

 23. A winter ovum; 24. A male ovum. (Cohn.) 



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