NO. 2256. DESCRIPTIONS OF TEN NEW IS0P0D8— BOONE. 593 



of antennae have the first and second articles about equal, 0.4 mm. 

 long, the third short and a flagellum of 10 articles, and extends about 

 to the first article of the flagellum of the second antennae. The sec- 

 ond pair of antennae has the first, second, and third articles very 

 short, stout, subequal ; the fourth and fifth articles about equal, each 

 as loiig as the first three articles taken together; the flagellum is 

 long, slender, tapering, consists of 18 articles and extends to the an- 

 terior margin of the fourth thoracic segment. The eyes are small, 

 round, complex, and situated in the anterolateral angles of the head. 

 The frontal lamina is conspicuous, with the anterior margin triangu- 

 late. The maxilliped has a palp of five articles. 



Thorax: The first segment is wide, with the lateral margin pro- 

 duced around the head to the posterior end of the eye. There are 

 no epimera on the first segment. The second to seventh segments 

 are similar, subequal, each about 1 mm. long; the epimera are dis- 

 tinct on all six segments and have the outer postlateral angles grad- 

 ually acutely produced, those of the last three extending consider- 

 ably beyond the segments. The first three pairs of legs are prehen- 

 sile, the last four ambulatory; the inner margins of all seven pairs 

 are furnished with strong spines. 



Abdomen : This has the first segment, except a small area on each 

 side, entirely concealed by the seventh thoracic segment ; the second, 

 third, and fourth segments are each about 1 mm. long, subequal, with 

 the postlateral angles incurvate; the fifth segment is slightly longer 

 than the fourth, but abruptly narrower and with the lateral parts not 

 produced; the sixth segment is 2 mm. long, subtriangular, with the 

 apex roundly truncate, crenulated, and ornamented with a row of 

 spines. The peduncle of the uropod is not quite 1 millimeter long 

 on the outer margin, but is nearly three on the inner, with the margin 

 between recurved; the inner branch is about as long as the sixth ab- 

 dominal segment, with the outer part evenly rounded and the inner 

 part broadly expanded and rounded posteriorly. The outer branch 

 is oval and about half as long as the inner. The entire margins of 

 both branches are decidedly crenulate and fringed with spines. 



Color : The specimen is heavily banded crosswise with light brown 

 stripes, with an equal light creamy area between them on the head, 

 thorax, and first five abdominal segments; the sixth segment and 

 uropoda are similarly marked but have the bands longitudinally 

 placed. 



The holotype, an adult male (broken), and another specimen were 

 collected in August, 1912, at Home Lagoon, Hermite Island, Monte- 

 bello Islands, Australia (Orig. No. 116), and are in the collections 

 of the Cambridge Museums, England. 

 3343— 19— Proc.N.M.vol.54 39 



