7() 



Fig. S^h. Epithelium of kidney, x 1,500. 



Fig. 33«. A fragment of the ovary in section, x 300. 



Fig. Sdb. Section of young ovum, x 600. 



Fig. 34a, h, c. Diagrams showing the development of sperms 

 in the testis (after Gihson). x ca. 350. 



Figs. 35 — 42. Figures of the development of Patella (after 

 Patten). Enlarged to various degrees. Fig. 36 

 is a ventral view. Figs. 37 — 40 are sections. 

 Figs. 41 and 42 are views of the oral (ventral) 

 side of the embryo. An.C. = Anal cells. Ap.D. 

 = Apical disc. Bj). = Blastopore. Cil.Ii. = Pre- 

 hlastoporal ring becoming the prototroch. Ect.= 

 Ectoderm E.-M. = Endo-mesoderm. Mcj). = 

 Micropjde. Me.so, or F.-B. = Foot rudiments 

 (mesoblastic). Mesen. = Mesenteron (endoder- 

 mic). Pr.-Tr. = Prototroch. Beet. = Eectal 

 evagination of midgut. Bad. = Invagination to 

 form the raduU^r sac. 



C. TiNi.iNft AND Co., Printers, 53, Victoiua STni-.r.T, Live iPooL. 



