362 



BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



CORYCELLA CARINATA (Giesbrecht) 



E!lGUKB 220 



Corycaeus carinatus Giesbrecht, Fauna und Flora des Golfes von Neapel, vol. 



19, p. 661, pi. 51, 1892. 

 Corycella carinata Faeran, Proc. Zool. Soc. London, 1911, p. 286, pi. 11, fig. 10. 



Occurrence. — Both sexes taken in a vertical haul at Station 20048, 

 Crrampus^ east of Monomoy Lighthouse. 



Distribution. — Tropical Pacific (Giesbrecht) ; Mediterranean. 

 Indian Ocean (Thompson and Scott) ; California coast (Esterly) ; 

 Chesapeake Bay (Wilson) ; Gulf Stream south of Marthas Vineyard 

 (Wheeler) ; Christmas Island, Indian Ocean (Farran). 



Color. — Body opaque with a variable extent of red, orange, and 

 yellow pigment distributed very irregularly, but usually concentrated 



around the mouth on the ven- 

 tral surface, in the epimeral lap- 

 pets, and on the dorsal surface 

 of the genital segment ; eye dark 

 red; eggs orange. 



Female. — Head completely 

 fused with the first segment, the 

 forehead flattened so that the 

 corneal lenses appear in profile 

 in dorsal view; second, third, 

 and fourth segments fused dor- 

 sally and concealing the fifth 

 segment, so that the metasome 

 appears 2-segmented in dorsal 

 view. Lappets on the third seg- 

 ment acuminate and reaching 

 beyond the center of the uro- 

 some; no lappets on fourth segment. The 1-segmented urosome 

 widest near the front; caudal rami half as long as urosome, four 

 times as long as wide. Total length, 0.86-0.92 mm. 



Male. — Head fused with first segment, the corneal lenses project- 

 ing from the forehead almost in hemispheres ; metasome apparently 

 2-segmented as in the female; urosome spindle-shaped, strongly 

 tapered anteriorly and posteriorly, widest at the center, two and a 

 half times as long as the caudal rami ; the latter 10 times as long as 

 wide. Total length, 0.75-0.8 mm. 



Remarks. — As this is the only species in the present area with a 

 ventral beak, this character alone will identify it. It is evidently 

 a tropical form and must be regarded as another straggler coming 

 by way of the Gulf Stream. 



Figure 220. — Corycella carinata: a. Female, 

 dorsal; h, female, lateral. (From W. M. 

 Wheeler) 



