PLATE 41. Various Objects. 



Figure 



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



2. Elements of the chyle, a, molecules ; b, free nuclei ; c, chyle-corpuscles ; </, one of the 



same with processes. 



3. Coccudina cost at a, D. 



4. Erythrceus ruricola. 



5. Bacilli and cones of the retina of animals. , |3, from the pigeon. , 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, ft, cone ; c. as above ; e, 

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

 y, from the frog, letters as above ; d, from the perch, letters as above ; i, part at 

 which the cone usually breaks oif ; k, radial fibre; /, expansion of inner granular 

 layer, e, twin cones. 



6. Frustulia-membranacea. a, valve ; b, front view of frustule. 



7. Emydium testudo. 7 a, 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 granulum, E. 



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



16. Mask (labium) of JEshna (LIBELLULID^E). 



17. Spermatozoa of Triton cristatus. 



18. Sarcoleimna of muscle, twisted. 



19-24. Navicula amphirhynchus 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 (Hypudaus) arvalis). 



28. Spermatozoa of rabbit (Lepus cuniculus}. 



29. Spermatozoa of goldfinch (Fringilla (Carduelis] elegans). 



30. Spermatozoa of blackbird (Turdus merula). 



31. Spermatozoa of wood-shrike (Lanius rufus). 



32. Spermatozoa of a Coleopterous Insect. 



33. Spermatozoa of frog (Rana temporaria). 



34. Spermatozoa of perch (Perca fluviatilis}. 



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



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



globule. 



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



of spermatozoa. 



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



39. Biblarium crux (leptostauron), E. 



40. Goniothecium gastridium, E. 



41. Periptera chlamidophora, E. 



42. Periptera chlamidophora, E. 



43. Aulacodiscus crux, E. 



44. Goniothecium odontella, E. 



45. Actiniscus sirius, E. 



46. Rhizoselenia americana, E. 



47. Cheetoceras didymus, E. 



