no. 1929. NEW ISOPODS FROM SOUTH AMERICA— RICHARDSON. 203 



Only one specimen was obtained by the U. S. Bureau of Fisheries 

 steamer Albatross off Lota, Chile, at a depth of 677 fathoms in yellow 

 mud. 



Type-specimen— Cat. No. 43654, U.S.N.M. 



This species differs from all the known species of the genus in the 

 form of the head, which has the antero-lateral angles produced and 

 obliquely truncate, and in having the two basal articles of the pedun- 

 cle of the second antennas directed forward. 



EXCIROLANA BRAZILIENSIS, new species. 



Body oblong-ovate, convex. Length 4J mm. ; width 2 mm. Color 

 in alcohol, yellow, marked with arborescent black markings. 



Head about twice as wide as long; 

 antero-lateral angles rounded. Anterior 

 margin produced in the middle in a 

 long, narrow process between the basal 

 articles of the antennas and dilated at 

 its extremity, which is confluent with 

 the frontal lamina. Eyes large, sub- 

 quadrate, and occupying almost the 

 entire lateral margin; they are separated 

 by a distance equal to the width of one 

 eye. The first pair of antennas have the 

 two basal articles of the peduncle sub- 

 equal and dilated; the third article is 

 narrower, but not longer than the sec- 

 ond; the flagellum is composed of 10 

 articles, and extends to the posterior 

 margin of the third thoracic segment. 

 The second antennas have a peduncle 

 composed of .5 articles, the first four of FlG> 2 ._ Excm0LANA BR azili ENS isxis. 

 which are short, the first and second f -,- 



being subequal, and the third and fourth subequal, each of the 

 second pair being twice as long as either of the first pair; the fifth 

 is twice as long as the fourth; the flagellum is composed of 13 

 articles and extends to the posterior margin of the fifth thoracic 

 segment. 



The first, fifth, and sixth segments of the thorax are the longest 

 and are subequal ; the second and third segments are the shortest and 

 are subequal ; the fourth and seventh are subequal. Epimera are pres- 

 ent on all the segments with the exception of the first and are in the 

 form of subquadrate plates, which in the last four have the outer 

 post-lateral angles slightly produced backward. 



The first 5 segments of the abdomen are short and subequal, the 

 first being half covered by the seventh thoracic segment ; all 5 seg- 

 ments are free at the sides, the last not being covered by the pre- 



