514 



CRUSTACEA. 



few short tufts of hairs. Lower as well as upper edge of hand, arm, 

 and carpus, acute. Right hand the larger. We have not the specimen 

 to verify the drawing, which we suspect may be wrong in the eyes. 



Family III. THALASSINHLE. 



Thalass*ta gracilis. 



Carapax Icevis, rostro perbrevi, acuto, margine extraorbitali acuto. Ab- 

 domen sparsim pubescens, marginibus integris, segmento caudali paulo 

 oblongo, postice bene rotundato, non longiore quam appendices caudales. 

 Pedes \mi subcequi, valde compressi, manu angusto-elongatd, margine 

 superiore subacute, breviter spinoso, infer lore integro et inermi, digito 

 mobili paulo breviore quam pars manus anterior, angusto, fere recto, 

 seriatim pubescente, digito immobili plus dimidio breviore, acuto. 

 Pedes 6 postici tenues; ^ti paulo breviores. 



Carapax smooth; beak very short, acute, also an acute point just ex- 

 terior to eyes. Abdomen sparsely pubescent, margins entire; 

 caudal segment a little oblong, regularly rounded behind, not longer 

 than the caudal appendages. Anterior feet subequal, much com- 

 pressed; hand long and narrow, with upper margin trenchant, 

 spinulous, and lower entire unarmed ; finger a little shorter than 

 part of hand anterior to it, narrow, nearly straight, seriately pubes- 

 cent; immoveable finger not half as long as moveable finger, acute. 

 Six posterior feet slender, fifth pair a little the shortest. 



Plate 32, fig. 5 a, animal, natural size ; b, side view of carapax ; c, 

 beak, upper view ; d, first pair of legs ; e, second pair ; /, part of ex- 

 terior maxillipeds ; g, caudal extremity. 



From shores of Telegraph Island, near Singapore. 



Length, two and a half inches. Eyes very small, projecting about 

 half as far as beak. Base of second antennse projecting but little 



