176 



Miss H. Richardson on the Isopods of the 



tudinal ridges on the segment, one in the median line and 

 one on either side of it. The uropoda are short, not reaching 

 the extremity of the abdomen, and reguUirly rounded. 



The legs are slender ; tlie first two pairs are covered with 

 long hairs and extend in an anterior direction, the other five 

 pairs extend in a posterior direction. 



The type and only specimen was collected by Mr. Heath 

 at Monterey Bay, California, at the surface. No. 22568, 

 U.S. N. M. 



22. Dynamene tuberculosa, sp. n. 



Body oblong-ovate ; colour light yellow^ almost white ; 

 surface of abdomen tuberculated. 



Head large, much broader than long, with a wide anterior 

 margin, broadly curving on either side of a small median 



Fig. 9. 



Dynamene tuberculosa, x 8. a, dorsal view ; b, lateral view. 



point. Eyes small, and situated at the extreme post-lateral 

 angle of the head. The first pair of anteiinaj, composed of 

 eight articles, reach beyond the middle of the first thoracic 

 segment. The second pair of antennaj, composed of twelve 

 articles, extend to the posterior angle of the first thoracic 

 segment. 



The first segment of the thorax is one and a half times 

 longer than any of the other segments, which are about equal 

 in length. The epimcra, which are distinctly marked, and 

 roundly produced at their posterior angles, are much broader 

 than long. 



The first abdominal segment is transversely crossed by 

 three suture-lines, indicated at thesides of the segment. Tiiree 

 small tubercles are situated in a transverse line on the posterior 



