PLATE 41.— Various Objects. 



Figure 



1 . CJdorogonium euchlorum, E., undergoing oblique division. 



2. Elements of the chyle, a, molecules ; h, tree nuclei ; c, chyle-corpuscles ; d, one of the 



same with processes. 



3. Coccudina costata, D. 



4. Erythraus ruricola. 



5. Bacilli and cones of the retina of animals, cc, /3, from the pigeon, ec, bacillus ; a, proper 



bacillus ; b, its pale inner extremity ; c, line of demarcation at the boundary of the 

 bacillar layer ; d, corpuscle of the outer granular layer. /3, cone ; c. as above ; e, 

 bacillus of cone ; /, proper cone ; g, globule of fat in the same ; h, expansion of cone, 

 y, from the frog, letters as above ; d, from the ])erch, letters as above ; i, part at 

 which the cone usually breaks off; k, radial fibre; I, expansion of inner granular 

 layer, e, twin cones. 



6. Friistidia membranacea. a, valve ; h, front view of frustule. 



7. Emydium festudo. 7 ct, isolated style ; 7 b, claw of leg. 



8. Macrobiotus Hufelandii. f ovary; 8 a, oesophageal bulb ; x its framework. 



9. Milnesium tardigrada. 9 a, pharynx, with + internal buccal lobes ; and f styles ; 9 b, 



right posterior leg, seen from beneath. 



10. Eucampia zodiaca. 



1 1 . Halteria grandinella, D., seen from above. 



12. Halteria grandinella, D., side view. 



13. Kerona polyporum, E. 



14. Gyges granidum, E. 



15. Lacinularia socialis, E.; 15 a, the same more magnified. 



16. Mask (labium) oi ^shna (Libellulid^). 



17. Spermatozoa of Triton cristatus. 



18. Sarcolemma of muscle, twisted. 



19-24. Navicula ampliirliynchus in conjugation. Fig. 19, side view of valve of parent-frus- 

 tule ; 20, frustules in an early state of conjugation ; 21, sporangial sheath ; 22, spo- 

 rangial sheath, with parent -frustules attached ; 23, sporangial frustule (front view), 

 with sheath and one parent-frustule ; 24, side view^ of sporangial frustule. 



25. Spermatozoa, human. 



26. Spermatozoa of rat {Mus rattus). 



27. Spermatozoa of field-mouse {Arvicola [HypudcBus] arvalis). 



28. Spermatozoa of rabbit {Lepus cunicidus). 



29. Spermatozoa of goldfinch {Fringilla {Carduelis) elegans). 



30. Spermatozoa of blackbird (Tw?'^«5 men/Za). 



31. Spermatozoa of w^ood-shrike {Lanius rufus). 



32. Spermatozoa of a Coleopterous Insect. 



33. Spermatozoa of frog {Rana temporaria). 



34. Spermatozoa of perch {Perca Jluviatilis). 



35. Spermatic cyst of rabbit, with five globules, a, separate globule. 



36. Spermatic cyst of rabbit, the globules containing each a spermatozoon, o, separate 



globule. 



37. Spermatic cyst of the common creeper (bird) {Cerfhia familiaris), containing a bundle 



of spermatozoa. 



38. a, b, c, Staurosira construens, E. 



39. Biblarium crux [leptostauron), E. 



40. Goniothecium gastridium, E. 



41. Periptera cldamidophora, E. 



42. Periptera chlamidophora, E. 



43. Aulacodiscus crux, E. 



44. Goniothecium odontella, E. 



45. Actiniscus sirius, E. 



46. Rhizoselenia americana, E. 



47. Chcetoceras didymus, E. 



