242 PROCEEDINGS OF THE ACADEMY OP 



MACROURA. 



Family GEBID.E. 

 Gebia longipollex, nov. sp. 



Front tridentate ; mirldle tooth largest, and presents at its ex- 

 tremity two small obtuse teeth, which give to it a l)ifid appearance 

 when looked at from above; furrowed in the median line; small 

 spine on antero-lateral margin of carapax just over the external 

 antennas; anterior portion of carapax rough and hirsute; scabrous 

 surface reaching about halfway to the dorsal suture. Hands equal, 

 smooth, without spines or teeth, marked with longitudinal rows 

 of hair; row on inferior margin ver^^ long; thumb long, reaching 

 almost to extrerait}^ of finger, slightl}' incurved ; movable finger 

 very pilose, with two teeth on inferior margin — one near base, 

 and one near apex ; latter receives point of thumb ; two very 

 small teeth situated together near base of thumb ; spine on upper 

 and lower apex of carpus, and two small ones on antero-lateral 

 margin ; spine on distal extremity of arm. Second pair of legs 

 ciliate above and below at extremity ; tarsus smooth ; third arti- 

 cle ciliate below, and armed with spine above at distal exti'emlty ; 

 remaining pairs unarmed. Caudal segment rectangular. 



Length, 1.12 inch. 



Family PALINURID.E. 



Panulirus guttatus, Gray. Palinurus guttatus, Latr. Ann. du Mus., torn. III., p. 

 393; M. Edw. Hist. Nat. des Crust., torn. II., p. 297, pi. XXII., fig. 1. 



Panulirus americanus. Palinurus americanus. Lamarck. M. Edw. Hist. Nat. des 

 Crust., tuiu. II., p. 298. 



Family PAL^EMONIDoE. 



Subfamily Alphein^. 

 Alpheus bispinosus, nov. sp. 



Carapax compressed ; rostrum short, acute; surface between the 

 e^-es carinated; anterior border of e3'e-shields rounded, and with- 

 out spines. Lamelliform appendages of external antennse not 

 quite as long as base, little longer than base of internal antennre. 

 Second article of internal antennae twice as long as first and third ; 

 basal tooth of inner antennas not longer than first article; basal 

 spine of outer antennas short, and hooked inward. Hands of first 

 pair of feet unequal ; margins of larger hand indented near the 



[December 5, 



