Bui,!.. U. S. B. F., 1909. 



Plate XI.V. 







p.cp 



ov. w 



(jv.ep 



^( •'^ ■ (,< ltd " n\ v> 



ov.w 



Bis 



m foi 



TTjcI 



Fig. 5. 



Figs. 1-5. — Diagrams to illustrate structure and growth of ovary of the lobster from first larval stage to maturity. Note the 

 primordial epithelium in larva {p. ep, fig. i), the germogenal folds {Ger.fd, fig. 3). and reentrant blood sinuses {Bl. s) formed 

 by foldings of this layer, the multiplication of epithelial cells along the crests of these folds, and their differentiation into ova 

 and follicle cells (see fig. i. pi. XI.V1), the development of glandular pouches after eggs are laid (fig. 4), and their recession 

 when the latter are ripe. Figure i, from larva; figures 2 and 3, from early and late adolescent stages; figure 4, from adult with 

 ovary nearly ripe; figures, from adult. 36 hours after extrusion of ripe eggs Bl. v, blood vessel; /o/, egg-follicle; Gl. ep, glandular 

 epithelium; ov. ep, ovarian epithehum; ov. w, ovarian wall. 



