48 Addis on E. Verrill, 



Bate records this species from eight stations (Voy. Challenger) 

 ranging from 6, 8, and 26 fathoms to 2675 fathoms. It is alto- 

 gether probable that it is strictly a surface or shallow water species 

 which, as often happens, was sometimes picked up by the deep-sea 

 trawl when the net had nearly reached the surface. The specimen 

 obtained by Heilprin, at Bermuda, and identified by W. Stone was. 

 perhaps, Penteopsis goodei. It has not been recorded from this 

 region by anyone else. 



Subfamily SICYONIN^ Ortm. . 

 This group includes only the genus Sicyonla. 



Sicyonia H. M.-Edw., 1830. Crested Shrimp. 



Sicyonia Dana, op. cit., p. 602, 1852. Stebbing, Hist. Crust., p. 218 

 (critical remarks). Edw. and Bouvier, op. cit., p. 243, 1909. 



The carapace has a rather high, crest-like, and dentate carina. 

 Rostrum carinate, toothed above, sometimes one tooth below near 

 tip. Abdomen carinated dorsally and sculptured by furrows. 

 Thoracic legs have no exopods. Abdominal appendages are not 

 biramous, except the sixth. No internal antennular scale. Ocular 

 segment with two submedian spines directed forward. Last two 

 pairs of feet have flattened dactyls. Telson pointed. 



The four recognized Florida and West Indies species of this 

 genus are pretty closely allied, but differ in the length of the 

 rostrum and arrangement of the rostral and carinal teeth. 



They may be distinguished as follows : 



Key to North Atlantic species of Sicyonia. 

 I. Three carinal teeth. 

 A. Rostrum long, truncate, with two or three terminal denticles. 



B. Rostrum with two teeth above, and also terminal spinules ; none 

 below ; abdomen feebly sculptured Iccrigata. 



BB. Rostrum truncate with two minute teeth above, one of which is close 

 to the tip ; one below ; carina with two larger teeth. Abdomen 

 strongly sculptured carinata. E. Atlantic. 



AA. Rostrum pointed, very short and narrow, with three large teeth 

 above, none below brevirostris=cristata Saus. 



II. Two carinal teeth ; rostrum not truncate ; abdomen strongly sculp- 

 tured. 



