304 



PROCEEDINGS OF THE \ \TI<>\ \L Ml si: I I/. 



vol. :;s. 



i:f 



it 



posterior extremity which is entirely lacking in E. gracilis (fig. 14); 

 carpus as broad as long in the former species, while in the latter it is 

 longer than broad. 



I The differences existing in the adult telson in the two species 

 are present to sonic degree in the young. In serratus the telson is 

 l>ut slightly, it' at all, longer than broad, much longer than peduncle 

 of third uropod, emargination V-shaped and extending beyond one- 

 half the distance to base (see table); that of E. gracilis broader than 



long, shorter than peduncle 

 of third uropod, emargina- 

 tion U-shaped and extend- 

 ing about one-third t he dis- 

 tance to base (figs. 15 and 

 17). In each species the 

 telson is armed distally 

 on each lobe with a single 

 long, stout spine. 



Notes on the reproductive 

 capacity. — A large number 

 of the specimens examined 

 were females with eggs in 

 their pouches, in many 

 cases t he eggs were counted 

 and certain measurements 

 taken in order to sliow 

 some correlation between 

 the number of eggs and 

 the size or age of the in- 

 dividual, and to give an 

 idea of the reproductive 

 capacity of the species. 

 Several specimens of E. gracilis were treated in a similar manner 

 fin comparison. The results of the observations concerning both 

 species are herewith given in tabular form. 



An examination of this table shows clearly that in general the 

 larger individuals, and hence the older, ' possess the larger number 

 of segments in the primary flagellum of first antenna, and also that 

 the larger complements of eggs are deposited by t he larger females. 



In the six largest individuals measured, those from 12.8 to 14.5 

 nun. long, the average number of eggs was eighty-two, In three 

 individuals of medium size, from ( .).7 to 11.5 mm. long, the average 

 u a- fort} -four. 



i.'. 



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Figs. 13 17. E. gracilis (young). Gnathopod i. x 159 



DIAM.; 14, GNATHOPOD 2, X 159 DIAM.; L5, UROPOD 3, X 159 

 DIAM.; 16, E. SERRATUS (YOUNG)! TELSON, X L59 DIAM. J 

 17. I'.. GRACILIS I 1TOUNG). TELSON, X 159 DIAM. 



