358 CIJESSWELL SHEARER. 



Fig 2i. — Reconstruction of tlie'nervous system in the female. The 

 brain surface is measured from the ganglion cells and not from the 

 fi!n-ous core. Ventral view, x 300. 



Pig. 22. — Sagittal section in the female showing the sac-like nature 

 of the ovarian cavity. 



Fig. 23. — A cell of the accessory gland of the male. 



Fig. 24. — Transverse section in the male in the region of the penis. 

 X 400. 



Fig. 25. — Eggs attached to the membranes of the lobster " beny." 



Fig. 26. — Oocyte twenty minutes after that shown in fig. 20. 



Fig. 27. — Spermatidia. 



Fig. 28. — Reconstruction of the nei-vous system of the male. 

 Venti-al view, x 300. 



Fig. 29. — Longitudinal section of the wall of the intestine in the 

 posterior region. 



Fig. 30. — Young, a short time after hatching. X 300. 



Fig. 31. — Section through the generative region in the male showing 

 the granule glands. 



Fig. 32. — Oocyte twenty minutes later than fig. 26. 



PLATE 20. 



Fig. 33. — Transverse section in the male through the region of the 

 vesicuht seminales. 



Fig. 34. — The same. In a region a little posterior to the last. 



Fig. 35. — Transverse section through the middle of the generative 

 I'egion in the male. 



Fig. 36. — Chitinous jaws. 



Fig. 37. — Horizontal section in the male. 



Fig. 38. — Transverse section through the middle of the second 

 segment. 



Fig. 39. — Transverse section through the anterior region of the 

 generative segment in the male, showing the divided nature of the 

 anterior portion of the testis. 



Fig. 40. — Transverse section thi-ough the posterior region of the 

 generative segment in the male. 



Fig. 41. — Transverse section through the dorsal region of the body- 

 wall in the caudal segment, showing the insertion of the obliq[ue muscle- 

 fibres. 



