530 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiii. 



One specimen from between the delta of the Mississippi and Cedar 

 Keys, Florida, collected by the U. S. Fish Commission steamer Alba- 

 t) OSS. 



Tyj)e.—^o. 9728, U.S.N.M. 



31. CYMOTHOA Fabricius. 



ANALYTICAL KEY TO THE SPECIES OF CYMOTHOA. 



a. Terminal segment lanceolate 79. Cymothoa lanceokda Say. 



a\ Terminal segment transverse; posterior margin widely sinuated or bilobed. 

 h. Anterior angles of the first thoracic segment short, acute; sides of the segment 

 a little constricted. Inner branch of the uropoda much shorter than outer 



branch 80. Cymothoa excisa Perty. 



b^. Anterior angles of the first thoracic segment very large, equaling or surpassing 

 the front of the head, rounded; sides of the segment fiexuous. Inner 

 branch of the uropoda manifestly longer that outer branch. 



81. Cymotlioa lestrum (Linnteus). 



79. CYMOTHOA LANCEOLATA Say. 

 Cymothoa lanceolata Say, Jour. Acad. Nat. Sci. Phila., I, 1818, pp. 3*J7, 398. 

 Habitat. — Cmnberland Island, Georgia. 



80. CYMOTHOA EXCISA Perty. 



Cymothoa cxcinaVERTY, Del Amin., p. 211. 



CymotJioa parasita Saussure, Mem. Soc. Phys. Geneve, XIV, Pt. 2, p. 485, pi. v, 



fig. 44. 

 Crustaceum quoddam, animalculum Acarapitambani ve.va)is JNIarcgrav, Hist, jjisc. 



IV, p. 155. 

 Cymothoa excisa Schicedte and Meinert, Naturhistorisk Tidsskrift, XIV, 1883- 



84, pp. 238-244, pi. vi, figs. 11-16. (See Schicedte and Meinert for synonymy. ) 



Habitat. — Massachusetts; Florida Reefs; Charlestown Harbor, 

 South Carolina; Bahamas; Biloxi, Mississippi; Cuba; Maranhao; 

 Rio Janeiro. 



8i. CYMOTHOA CESTRUM (Linnaeus). 



Oniscus cestnun Linn.eus, Syst. Nat., 10th ed., I, p. 636, No. 2; Fauna Su., 2d 



ed., p. 499, no. 2053; Syst. Nat., 12th ed., I, Pt. 2, p. 1059, No. 2. 

 Asellus mstrum Olivier, Encycl. method, IV, p. 253. 

 Cymothoa mstrum Fabricius, Entom. Syst. II, p. 505, No. 6.— Leach, Trans. 



Linn. Soc, XI, p. 372; Diet. Sc. Nat., XII, p. 352.— Desmarest, Consid. gen. 



Crust., p. 309, pi. XLVii, figs. 6-7. 

 Cymothoa dufresnei Leach, Diet. Sc. Nat., XII, p. 352. 

 Cymothoa immerm Say, Journ. Ac. Nat. Sc. Phila., I, 1818, pp. 399,400. 

 Cymothoa oestrum ScniCEDTEand Meinert, Naturhistorisk Tidsskrift, XIV, 1883-84, 



pp. 271-279, pi. VIII, figs. 5-13. 



Habitat. — Caribbean Sea and Gulf of Mexico to shores of Virginia: 

 Swan Island; St. Bartholomew; St. Christopher; Jamaica; Guade- 

 loupe; St, Anna, Mexico; Key West, Florida; Curacao, Venezuela. 



