40t) CRU;STACEA, Etc. [<i3ctobcr. 



The specimens above referred to are the only one^ 

 which have occurred, that of the museum of South Caro- 

 lina was found by Mr. L'liermenier at Gaudeloupe, that 

 of the Richmond museum, 1 was informed, was taken .on 

 the coast of the United States. 



Genus SPHiEROxMA. Latr. 



Body contractile into a sphere; tail entire; lateral 

 styles foliaceous, bifid, lacina3 equal; head extended be 

 hind, on each side, into oculiferous lobes; nails bifid. 



SPECIES. 



S. quadridentata^ , Body oval; tail^ terminal segment 

 semioval, equal, external lateral lamella four-toothed. 



Inhabits coast of Georgia and of East Florida. 



Cabinet of the Academy. 



Body oval, punctured; tail^ terminal joint equal t© 

 the five preceding segments conjunctly, semioval, trun- 

 cate at base and rounded at tip, surface equal, punc- 

 tured, convex at base and concave before the tip, lateral 

 lamellce, interior one oblong-oval, acute, entire, carinate 

 at base over the insertion of the exterior one, exterior 

 lamella serrate on the outer edge with about four teeth, 

 of which the anterior one is placed rather before the mid- 

 dle, smallest, minute, obsolete or ^\'anting, inner edge 

 rectilinear, ciliated; colour brownish or horn colour, when 

 recent, usually varied with large whitish or rosaceous 

 spots and with numerous minute brown points; incisures 

 usually pale yellow; eyes and nails black; exterior lateral 

 lamella immaculate. 



