122 BULLETIN OF THE 



Batraehonotus nov. gen. 



Carapax triangular, broadly expanded behind ; surface rough with gran- 

 ulations ; gastric, cardiac, and branchial regions strongly protuberant ; cer- 

 vical depressions deep and broad, giving the carapax a superior outline 

 much like that of a frog's back. Rostrum very short, not extending beyond 

 the walls of the antennulary fossae, rounded in outline, and slightly emargi- 

 nated at the middle. Basal joint of the external antenna? with a small 

 tooth or spine on the outer margin, but none at the anterior extremity. 

 No spine on the orbital arch. Post-ocular spine minute. Meros-joint of 

 the external maxillipeds broad, with prominent external and internal 

 anterior angles. Ambulatory feet simple ; those of the first pair dispro- 

 portionately long, nearly twice as long as those of the second pair ; those 

 of the posterior pairs very short. Dactyli of ambulatory feet rather long. 

 Abdomen very narrow at base. 



It differs from the other genera of Collodinae, among other characters, in 

 the want of a terminal spine on the basal joint of the antennas, and in its 

 very long anterior and short posterior ambulatory feet. 



Batraehonotus fragosus nov. sp. 



The following description is that of a male. Body and feet naked. On 

 each of the protuberant regions of the carapax there are one or two larg^fe 

 and many smaller rounded tubercles or granules. A strong tubercle on 

 the basal joint of the abdomen. A sharp tubercle on the subhepatic, and 

 one on the pterygostomian region. Sternum regularly granulated. Cheli- 

 peds as long as the carapax, and sparsely granulated within; ischium with 

 an erect spine at the summit ; hand unarmed ; fingers toothed and slightly 

 gaping. Ambulatory feet of the first pair about three times as long as the 

 carapax. 



Color of the body in the alcoholic specimen whitish, or pale flesh-color, 

 variegated with purplish. 



Of this species we find in the collection only one specimen, a male, the 

 dimensions of which are: Length of the carapax, 0.28; breadth, 0.245; 

 length of ambulatory feet of the first pair, 0.80 inch. 



The specimen was taken in N. Lat. 24° 36' 40", W. Long. 83° 2' 20", on 

 the 22d of January, 1868. Cast No. 3. Depth 16 fathoms. 



Euprognatha nov. gen. 



Carapax pyriform. Rostrum short, trifid, the median horn being the 

 interantennular spine, which points forward and downward at a much lower 

 level than that of the other two horns, which are minute and divergent. 



