A. E. Verrill — Decapod Crustacea of Bermuda. 305 



Crustacea obtained is not large, for the fishes were the special 

 objects sought, but it contains many interesting species, some of 

 them not previously found. 



Whenever possible I have given the season when females carrying 

 eggs were taken. 



Since many species may have been formerly introduced by adher- 

 ing to the bottoms of vessels, and others may be introduced here- 

 after in the same way, I have thought it advisable to mention 

 particularly the earlier occui-rences of all the species, so far as I 

 know. But very few dates can now be given earlier than those of 

 the collection of J. M. Jones, which was fortunately quite large. 

 Much of his collection was made as early as 1859 to 1866, but his 

 specimens had no labels giving precise dates. Abundant opportunity 

 for the introduction of West Indian species have prevailed for nearly 

 yOO years, but they have much increased in modern times, especially 

 since the establishment of the great naval dry dock. Vast numbers 

 of living marine animals are always scraped from the bottoms of 

 foul vessels, besides barnacles. 



BRACHYURA. 



Key to the Superfamilies or Tribes of Brachyura.* 



A. — Buccal frame quadrate ; eflEerent branchial channels opening at the sides of 

 the endostome. 



B. — C.ivapace usually quadrilateral, frontal region curved downward. Verges 

 inserted either in the sternal plastron or in the basal joints of the fifth pair 

 of legs of the male, thence passing through channels in the sternum, beneath 

 the abdomen - - - Catometopa 



B^ — Carapace not quadrilateral. Verges inserted in basal joints of the fifth 

 pair of legs. 



C. — Carapace short and broad, rounded in front, without a projecting frontal 

 rostrum Cyclometopa 



C. — Carapace usiially more or less triangular or ovate, with a projecting, pointed, 

 forked, or spined rostrum - - - Oxyrhyncha 



A'. — Buccal frame usually triangular, narrowed forward ; efferent canals open- 

 ing at middle of the endostome. Verges inserted in the basal joint of the 

 fifth pair of legs Oxystomata 



* Taken with slight alterations from Brachyura and Macrura of Porto Rico, 

 by Miss M. J. Rathbun. 



