152 



BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



segment prolonged backward and entirely covering the abdomen in 

 dorsal view, with two or three fingerlike outgrowths on the dorsal 

 surface; right caudal ramus larger than left; endopod of fifth leg 

 very short, tipped with two equal spines, exopod curved strongly 

 inward, ending in a single acuminate point, with four small outer 

 spinules. Total length, 4.25-4.5 mm. 



Male. — Body shorter and narrower than in the female; corners of 

 fifth segment symmetrical and not reaching the distal margin of 

 genital segment; urosome 5-segmented, nearly symmetrical, the left 

 caudal ramus slightly the larger; end segment of left fifth leg with 

 two equal apical spines, two outer spines more slender but nearly as 

 long, and rows of long hairs on the posterior surface ; hand of chela 

 on right leg with a curved and corrugated process at the proximal 

 corner, and two processes on the inner margin, one long and pointed, 

 the other semicircular. Total length, 3.85-4.1 mm. 



Remarks. — This species is readily recognized by the swollen ros- 

 trum, which is distinctly reddish in alcoholic specimens, by the 



asymmetry of the fifth segment and 

 urosome, and by the fifth legs. It 

 has not been reported previously 

 from our American shores. 



PONTELLA SPINIPES Giesbrecht 



Figure 103 



Pontella splnipes Giesbrecht, Atti Accad. 

 Lincei, Rome, ser. 4, vol. 5, sem. 2, 

 p. 28, 1889; Fauna und Flora des 

 Golfes von Neapel, vol. 19, p. 462, pis. 

 24, 40, 1892. 



OccujTence. — One female from 

 surface tow. Station 1107, Fish 

 Hawk, south of Nantucket. 



Distribution. — Indian Ocean 

 (Giesbrecht) ; Atlantic (Wolf en- 

 den) ; Antarctic Ocean (T. Scott). 

 Color. — General color reddish brown, the antennae and mouth 

 parts colorless and completely transparent. 



Female. — Body rather short and stout; left posterior lobe of the 

 fifth segment conspicuously larger than the right and reaching the 

 tips of the caudal rami; urosome 2-segmented, the abdominal seg- 

 ment entirely covered dorsally by the overhanging genital segment; 

 one outgrowth on the dorsal surface of the latter; right caudal ramus 

 a little larger than the left, but with shorter setae; dorsal surface 

 of genital segment transversely corrugated ; the genital opening pro- 

 truding and twisted to the right; endopod of fifth legs very short, 



FiGDEE 103. — Pontella spinipes: a. Fe- 

 male dorsal ; i, female, fifth leg 



