274 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



Color, l)rown. 



Specimens were found at Great Egg Harbor, New Jersey, by Dr. 

 William Stimpson. 



Ti/pe.—C^t No. 4402, U.S.N. M. 



This species is very similar to the following one, and may prove to 

 be the same. As the type and only specimen of Say's species is in 

 such a bad state of preservation, I am unwilling as yet to identify this 

 species with it. 



CASSIDISCA OVALIS (Say). 



Na-sa oralis Say, Jour. Acad. Nat. Sci. Phila., I, LS18, pp. 484-485. — Richard- 

 son, American Naturalist, XXXIV, 1900, p. 224; Proc. U. S.'Nat. Mas., 

 XXIII, 1901, p. mi. 



LoeaJitij. — Soutli Carol i na. 

 Depth. — Found on surface. 



"'"Body oval, depressed; ultimate segment of the tail obtuse, with 

 three hardly raised, very obtuse lines at base; lateral ap]>endices 

 dilated, three caudal segments. 



'*■ Inhabits bays and inlets of the United States; connnon. Cabinet 

 of the Academy. 



"' Body perfectly oval, segments subequal, fourth, fifth, and sixth 

 largest, first segment of the tail equal to the 

 preceding one, simple; terminal segment tri- 

 angular, obtusely rounded at tip, rectilinear 

 each side, half as long as the body, with three 

 longitudinal, abbreviated, raised, very obtuse 

 lines at base, of which the middle one is most 

 Fig. 28.5. —CASSIDISCA ovalis. conspicuous; lateral processes dilated, de- 

 ABDOMEN WITH uEupoDA. pj-esscd, rcctilincar within and rounded on 

 the external margin, so as to form with the 

 terminal segment a perfectly semiorbicular termination of the body, 

 without interval; head somewhat unecpial; eyes conspicuous, hemi- 

 spherical; antenna' etpial; labrum triangular, advanced, very conspic- 

 uous, terminating the head before and forming, with the base of the 

 superior antenna* behind it, a rounded termination without interval, 

 completing the oval form of the l)ody; feet all armed with bitid nails, 

 none of which close on the preceding joint. 

 "'Length less than three-twentieths of an inch. 



""This little animal is extremely conmion in sea water, usually 

 creeping on fuci and other marine plants; we found it as far south as 

 St. Johns River in Florida." Say." 



A dried specimen, mounted on a pin, the type and oidy specimen of 

 this species is in the Philadelphia Academy of Natural Sciences. The 

 specimen was loaned me for examination. 



«Journ. Acad. Nat. Sci. Phila., I, 1818, pp. 484-485. 



