^N ' OF THE UXITED STATES. B?? 



Acute, somewhat elevated spine ; ratlier smaller tliaa 

 (t, fasciatiis. 



Tills cpecics. wliicli is an inhabitant of the salt ^yn^ 

 ter, I caught in the bay of E2;g-harboar, and near the 

 mouth of 8t. John's river, Florida; it is remarkable 

 for the dorsal, immovable spines, by which it is very 

 readily distinguished from others, but it is necessary 

 to observe that in the male these dorsal spines are of- 

 ten less distinct than in the female, sometimes indeed, 

 in this eex they v^yq entirely wanting on the eighth and 

 teniii segments, and that of iiie ninth is very small. 



4- Gr, '-^appendicidatiis. Caudal segmerdSp and 

 three terminal segments of the body, dentated on their 

 posterior edges 5 feet in one sex, second pair didac^' 

 tjie. 



Inihabits Georgia, 



Cabinet of the Academy. 



Cl^peus not extended beyond the frontal curve t^ 

 eyes moderate, oval, hardly extending above the infe- 

 rior base of the superior antennae ; fcet^ anterior pair 

 uliform, liand somewhat dilated, nail placed on tiie^ 

 middle of tlie tip, short, curved, acute, second pair of 

 feet in one sex with one of the hands very large, di-- 

 dactyie, nearly equal to one half of the body, siib- 

 pbovate, inferior edge rounded, superior one rectiliaeai> 

 terminating at the base of the tiiumb in an obtuse au- 

 i^lcy tip or palm of the hand tridentate, lower tootfei. 

 very small,, fingers deflected nearly right aagulariy^^ 

 thumb grooved, gi-covc fonoing an emargina at tii^ 

 fniter tip for the rerepiiofl of the tip of thi^ 5!iij;er ; (\p 



