596 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 5%. 



is about 1.4 mm. long in the median area but narrows toward the 

 sides and has the posterior margin recurved. The terminal segment 

 is 4.8 mm. long and 5 mm. wide, slightly asymmetrical, shield-shaped. 

 The uropoda have the peduncle quite flexible and the inner posterior 

 angle decidedly elongated ; the inner blade is elongate-ovate, fringed 

 with hairs; the outer blade is about 1 mm. longer than the inner, 

 has the outer margin decidedly curved and the inner nearly straight. 

 The uropoda are not quite as long as the terminal segment. 



The pleopoda are rather thick, ovate, leaf-like structures, but are 

 too broken in the type-specimen to permit of critical diagnosis. 



The holotype, an ovigerous female, was collected off the coast of 

 California by Messrs. LeConte and Dana in 1866 and is in the col- 

 lections of Yale Museum, Cat. No. 302. 



This species is the first representative of the genus recorded from 

 the west coast of North America, all previously recorded species be- 

 ing from the east coast of South America. 



PTERISOPODIDAE, new family. 



Body strongly depressed, oval. Mandibles small, with a palp of 

 three articles. Cutting edge broad, dentate. First maxillae with 

 outer lobe slender, tipped with small spines ; inner lobe feeble. Max- 

 illiped with a palp of two articles. Eyes feebly developed, incon- 

 spicuous. 



Thorax: All seven segments with lateral extremity widely ex- 

 panded and produced distally into an acute, roughly triangular 

 process with apex directed posteriorly, this formation becoming morr; 

 conspicuous on the last three segments. Epimera perfectly fused 

 with segments. Legs: All seven pairs strongly prehensile. Tha 

 first joint strongly produced into a curious wing-like process which 

 is roughly triangular, with the apex directed outward and pos- 

 teriorly ; that of the first leg fused with the thorax ; those of second 

 to seventh free, conspicuous. 



Abdomen: Compressed, decidedly narrower than thorax, com- 

 posed of six segments, strongly curved and produced posteriorly, 

 overlapping each other; sixth segment large. Uropoda lateral, fan- 

 like. 



PTERISOPODUS, new genus. 



With characters of family, only genus known, of which the type is 

 Pterisopodus bartscld, new species, collected in Bahia Honda, Cuba. 



PTERISOPODUS BARTSCHI. new species. 



Plate 89, figs. 2-5. 



Body strongly depressed, oval, 14 mm. long, 10.8 mm. wide; tho- 

 racic margins produced acutely into roughly triangular, wing-like 



