315 GENUS LAXCEOLA. [Augiisf, 



rounded; tJiorax oval, convex above and beneath, 

 seven jointed, sutures imbricate : feet fourteen, sim- 

 ple, two anterior pairs compressed, terminal joints 

 conic compressed, remaining pairs somewhat cylindric, 

 armed with a minute, subterminal nail, sixth pair 

 much the longest ; vesicular brancJiice oblong, distinct, 

 [daced at the inner base of the feet, excepting the first 

 and seventh pairs ; abdomen abruptly much narrow- 

 er than the thorax, of three subcylindrical segments, 

 each furnished with natatory feet ; tail depressed, three 

 jointed, joints famished each with a lateral style, which 

 consists of a foliaceous linear peduncle, supporting two 

 acute lanceolate, subcqual lamellae, two anterior styles 

 equal, posterior pair rather shorter, terminal segment 

 attenuated between the posterior styles, 



SPECIES. 



L. ^jpelagica, Antennce, inferiores UKU^e than half 

 as long as the thorax, superiores attaining the middle 

 of the third joint of the inferiores ; anteiincfform pro- 

 cesses surpassing the second joint of the inferior an- 

 tennae ; thorax, first segment shortest, acutely angled 

 l)efore near the clypeus, second and third segments 

 longest, equal ; feet, anterior pair shortest, third, 

 fourth, and seventh equal, fifth longer, sixth longer 

 than tlie thorax. 



Length one inch and one fourtli 



Inhabits — Gulf-stream. 



Cabinet of the Academy. 



Two specimens of this animal were found by Capt, 

 Hamilton, in th^ Gulf- stream, and from them, although 



