128 
Hyas araneus. (sée above) and as in the last zoea-stage of the 
American species Cancer irroratus (S. I. Smith, Metamorph. of 
lobster and other crust.; U. S. Commission of Fish, and Fisheries 
1871—72 (1873); p. 530, PL: 8, fig. 37). "Smith does not give 
Fig. 35. Brachyurid-larva (L. a. = labrum). 
any detailed description or fig. of the 1st Zoea; "but the existence 
of åa pair of dorsal spines on the 5th abdominal segment in his 
fig. seems to be the sole -discrepancy not due to the difference 
in age. — 
Description of the larva. 
The length between the tips of the rostrum and of the dorsal 
spine 2 mm. The rostrum is about twice as long as the carapace 
