DESCRIPTION OF A NEW SPECIES OF ISOPOD OF THE 

 GENUS CLEANTIS FROM JAPAN. 



By Harriet Richardson, 



Collaborator, Division of Marine Invertebrates, United States National Museum. 



The following description is of a new species of Isopod crustacean 

 belonging to the genus Cleantis. The smgle specimen is part of a 

 collection received through Dr. Edward S. Morse from the Imperial 

 University of Tokyo. 



Family IDOTHEIDiE. 



Genus CLEANTIS Dana. 



CLEANTIS JAPONIC A, new species. 



Body narrow, elongate, about four and a half times longer than its 

 greatest width, 18^ mm.: 4 mm. Surface somewhat granulate; color 

 light brown, with longitudinal stripes of dark brown, arranged in five 

 bands, the median and the outer lateral bands being wide, and the 

 inner lateral bands narrow. 



The head is 32 mm. wide and 2\ mm. long; its anterior margin is 

 excavate in the center. The eyes are much wider than long, and 

 placed laterally, with only a portion showing in a dorsal view; they 

 are situated on the anterior half of the lateral margm. The first 

 antennas are composed of four articles, the termmal one of which is 

 the flagellar article; they extend to the end of the second article of 

 the peduncle of the second pair of antennae. The basal article is fur- 

 nished with a small tubercle about the center. The second antenna? 

 have the first article of the peduncle short and inconspicuous in a 

 dorsal view; the following four articles have a carinate process along 

 the inner, ventral side. The fourth and fifth articles are subequal 

 and arc a little longer than the second and tliird, wliich are approxi- 

 mately equal. The flageUum consists of a shigle clavate article, 

 about the length of the last peduncular article, and a minute termintd 

 one. The maxillipeds have a palp composed of five articles. 



Proceedings U. S. National Museum, Vol. 42— No. 1883. 



