48 NEW-YORK FAUNA — CRUSTACEA. 



(EXTRA-LIMITAL.) 



C. ovalis. (Say, I.e. Vol. 1, p. 394.) Body oval; eyes concealed ; head attenuated and rounded be- 

 fore. Terminal segment rounded at tip, as long as the four preceding ones united. Length, 1-0; 

 breadth, 0*5. Hab. mouth of Tautoga americana and Labrax rufus of this report. 



C. impressa. (Id. lb. p. 397.) Body oblong; head attenuated, terminating acutely between the bases 

 of the antenna?. Tail widely emarginate at tip, depressed in the middle so as to appear almost bi- 

 lobate, as long as the seven preceding. Length, 1 • 0. Hab. . Cape May, N. J. 



C. lanceolata. (Id. lb.) Body ol long-oval ; head broader than long. Last caudal segment dilated, 

 lanceolate, longitudinally carinate above, as long as the six preceding. Length, 0*7. Cumber- 

 land island, Ga. 



C. (jEga) oculata. (Id. lb.) Body elongate-oval. Head trilobate behind ; middle lobe smallest. Ab- 

 dominal segments not shorter than the terminal thoracic ones. Eyes large : facets regularly hexa- 

 gonal. Last segment of the tail rounded, ciliate, shorter than the four preceding. Length, 0*5. 

 Hab. Sargus ovis of this report. Florida. 



C. immersa. (Id. lb. p. 399.) Head subquadrate ; first segment of the thorax profoundly emarginate 

 for the head ; last segment of the tail large, membranaceous towards the tip ; lateral appendices 

 very short; large joint of the fourth pair of feet extended behind into a spine. Length, 1-75. 

 Southern States. 



C. astrum. (Leach, Diet. Sc. Nat. Vol 12. Desmarest, pi. 47, ficr 6, 7.). Oblonn- sublinear. 

 Carinae of the eight last coxa? acuminate at their base. Head subquadrate, transverse; last seg- 

 ment of the tail subquadrate, truncate behind, broadly emarginate. According to Dr. Gould, 

 found on the coast of Massachusetts. 



GENUS LIMNORIA. Leach. 



Body oblong-linear, convex. Head nearly as large as the first segment, with the eyes on the 

 upper surface distant, distinct, granular. Antennas subequal. Tail of six distinct rings. 

 Caudal appendices composed of two lamella? on each side of the tail. Marine. 



LlMNORIA TEREBRANS. 



PLATE IX. FIG. 33. 



Limnoria terebraiis. Leach, Lin. Trans. Lond. Vol. 11, p. 370. Sup. Encycl. Ed. Vol.7, p. 433. 



X. id. Desm. Consid. Crustacea, p. 312. 



L. id. Coldstream, Ed. Phil. Jour. 1834, pi. 6, fig. 1-18. 



L. id. Thompson, lb. 1835. 



L. id. Gould, Invertebrata of Mass. p. 338 and 354, cum fig. 



Description. Body oblong-linear, with both extremities rounded, composed of seven seg- 

 ments, each bearing a pair of short feet ; the following segments small, except the penultimate 

 and the last which are broad. Female larger than the male, and recognized by the pouch in 

 which she carries her eggs and young. Capable of rolling themselves up in a ball. 



Color, ashen grey. Eyes of a blackish brown. Length, - 15. Breadth, 0-06. 



