456 APPENDIX TO CRUSTACEA [December, 



gion of the eyes equal; ocular peduncles slightly project- 

 ed before the eyes in an obtuse spine; antennce shorter 

 than the rostrum, a small spine at their exterior base;yd'<?f, 

 anterior pair acutely spinous above and beneath, third 

 joints of the remaining feet three-spined at tip, of which 

 the superior one is very robust, elevated, obtuse, and half 

 as long as the first joint of the tibia; abdomen obtusely 

 carinated in the male. 



Length one half, breadth one fourth of an inch. 



I obtained but a singl e specimen of this remarkable 

 species (a male) in the bay of Charleston on a Gorge- 

 nia. It is sufficiently distinguished from the other spe- 

 cies of the genus by the very remarkable spine at the tip 

 of the third joint of the feet. 



G<?;m^ PORCELLANA. 



Thorax orbiculate-subquadrate; antennae, interiores 

 Vi/ith an elongated peduncle, exteriores elongated, setace- 

 ous; external pedipalpi with the inner first joint dilated 

 within; feet ten, anterior pair didactyle, dilated, fifth pair 

 spurious; tail bilamellate each side. 



SPECIES. 



p. soriata^. Carpus and hand tuberculate before, tu- 

 bercles very obtuse, each composed of from four to nine 

 granules; anterior part of the thorax deeply crenate, ere- 

 nse inflected, in the two lateral ones are placed the eyes 

 and antenniB. 



Inhabits the southern coast. 



Cabinet of the Academy. 



Thorax naked, edges granulated, an anterior trans- 



