NO. 1479. 



NEW ISOPOD CRUSTACEANS— RICHARDSON. 



The color of the body is brown, more or less marked with black 

 spots. The lower half of each segment of the thorax and the tuber- 

 cles of the abdomen are a dull yellow. 



This species is closel}' allied to C. longlstyUs Miers," but ditfers in 

 the absence of tubercles on the thoracic segments, and in the disposi- 

 tion of those on the terminal abdominal segment. 



Locality unknown. The type and only specimen, a male, is in the 

 U. S. National Museum, Cat. No. 32242. 



CYMODOCE JAPONICA, new species. 



Bod}' Ti mm. wide; ITi mm. long. 



Head large, longer than the second thoracic segment, its anterior 

 margin ridged and sinuated and produced in a large median point. 

 The basal joint of the peduncle of the first pair of antennae is large and 

 elongated; the second joint is 

 small and short; the third joint 

 is long and slender. The fla- 

 gellum is composed of nineteen 

 articles and extends to the pos- 

 terior angle of the first thoracic 

 segment. The flagellum of the 

 second pair of antennae is com- 

 posed of twent3"-four articles 

 and reaches the posterior angle 

 of the third thoracic segment. 



The thoracic segments are 

 about equal in length. The 

 epimera are broader than long and are produced into acute angles, 

 becoming more rounded and obtuse in the three posterior ones. 



The first segment of the abdomen has two suture lines on either side 

 indicating coalesced segments, and a transverse line indicating still 

 another coalesced segment. Its posterior margin bears two tubercles, 

 pointing downward and on either side of these a small tooth overlap- 

 ping the terminal segment. The last segment is posteriori}^ excavated, 

 with a large and broad median tooth within the excavation. This 

 median tooth has a truncate extremity, while the lateral teeth, formed 

 by the sinus, are more acute and rounded. Two small tubercles are 

 situated at the base of this segment in the line with those of the first 

 segment. Following these, and in the same line, are two very large 

 tubercles. A longitudinal furrow or groove in the median line is formed 

 by these two sets of tubercles. The inner branch of the uropoda is 

 truncate at the extremity, is of equal breadth throughout its length, and 

 does not extend ])ey ond the extremity of the abdomen. The outer branch 

 is rounded on the inner side, but has a straight thickened outer edge, 

 terminating acutely; it is about as long as the inner branch. 



Fig. 11. — Cymodoce japonica. Abdomex and last 

 thokacic segment of male. x 4f. 



«Zool. Coll. of Alert, 1884, p. 305. 



