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 Gleantis. The single specimen is part of a 

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

 University of Tokyo. 



Family IDOTHEHME. 

 Genus CLEANTIS Dana. 



CLEANTIS JAPONICA, new species. 



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

 greatest width, 18 J 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 3J 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 margin. The first 

 antennae are composed of four articles, the terminal one of which is 

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

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

 nished with a small tubercle about the center. The second antennas 

 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 are a little longer than the second and third, which are approxi- 

 mately equal. The flagellum consists of a single clavate^ article, 

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

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



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



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