ON THE FOEMATION OE THE EGG IN THE ANNULOSA. 
627 
PLATE XVII. 
Fig. 30. Secretory organ of Chelifer. X 30. 
Fig. 31. Testis of Chelifei'. x30. 
Fig. 32. Mass of spermatozoa of Chelifer. x250. 
Fig. 33. Contents of testis. x250. 
Fig. 34. Contents of testis of Obisiiim. x250. 
Fig. 35. Contents of testis of Chelifer. x250. 
Fig. 36. Secretory organs of male Chelifer. X 60. 
Fig. 37. Two egg-tubes of Petrohius maritimiis. X 30. 
Fig. 38. Nuclei from free end of Petrohius marithmis. X 250. 
Fig. 39. Young egg of Petrohius marithnus. X 250. 
Fig. 40. Purkinjean vesicle, more advanced. x250. 
Fig. 41. Purkinjean vesicle, more advanced. x250. 
Fig. 42. Purkinjean vesicle, more advanced. X 250. 
Fig. 43. Purkinjean vesicle, more advanced. x250. 
Fig. 44. Youngest Purkinjean vesicles of Oniscus. x250. 
Fig. 45. Testis and vas deferens of Phalangium cornutum. 
A. Diagram of ovary of Glomeris. 
B. Diagram of ovar)' of Coccus. 
C. Diagram of ovary of Phalangium. 
4 Q 
MDCCCLXI. 
