592 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.54. 



slightly expanded at the base, where it is about half as wide as the 

 middle blade ; thence narrowing to a mere line with the inner margin 

 produced into three low, blunt undulations. The superior and mid- 

 dle blades are separated by a comparatively straight groove; the 

 middle blade is subovate, broadly expanded in the middle, with the 

 inner margin recurved, giving the appearance of four conical teeth ; 

 the area between the middle and inferior blades is a deeply excavated, 

 twisted groove; the inferior blade is three-fourths as long as the 

 middle blade, is broadly expanded, subtriangular, with the apex 

 produced and truncate, and the inner margin undulating. The 

 maxilliped has a palp of four articles. 



Thorax: The first segment is rudimentary, united with the head 

 as indicated by a suture line on the median dorsal area ; the second 

 and third segments are each about 1 mm. long with the lateral parts 

 curved and expanded anteriorly; the fourth segment is slightly less 

 than 1 mm. wide, with the anterior margin straight, the postlateral 

 parts very little produced ; the fifth segment is extremely long, about 

 3^ mm., subconvex, marked anteriorly by a ridge-like carination 

 from side to side and longitudinally by a median depression; the 

 sixth is similar to the fifth, but slightly longer and tapering pos- 

 teriorly; the seventh segment is abruptly narrower than the pre- 

 ceding segment and is surrounded by the projections of the sixth 

 segment. 



Abdomen: This has the first five segments distinct, similar, each 

 almost 0.6 mm. long, subconvex, and the terminal segment triangu- 

 lar, 2| times as long as the preceding segment. The uropoda have 

 the peduncle extremely short; the inner branch, long, narrow, pos- 

 teriorly obtusely tnmcated; the outer branch is similar but is ob- 

 tusely pointed posteriorly. 



The holotype, an adult male, and two additional specimens (Cat. 

 No. 50408, U.S.N.M.) were collected by the United States Bureau of 

 Fisheries steamer Fish Haiok at station 7282, Gulf Stream off Key 

 West, Florida, February 19, 1902, in a depth of 109 fathoms. 



This species is readily distinguished by its unique mandibles and 

 the curiously excavated head. 



Suborder CYMOTHOIDEA. 

 Family CIROLANIDAE. 



CIROLANA HERMITENSIS, new species. 



Plate 91, fig. 2. 

 Body oblong-ovate, 9 mm. long, 4.9 mm. wide. Head wider than 

 long with the frontal margin widely, evenly rounded.^ The first pair 



^ The frontal margin is evenly rounded. The cleft appearance in plate 3, figure 2, Is 

 caused by the artist's representation of the antennae. 



