DESCRIPTION OF A NEW ISOPOD GENUS OF THE 
FAMILY DAJID. 
By Harrinr Ricuarpson. 
Collaborator, Division of Marine Invertebrates, U. S. National Museum. 
During the summer of 1884, the U. S. Bureau of Fisheries steamer 
Albatross collected a curious isopod off the south coast of Long Island 
at a depth of 707 fathoms. The specimen has been in the Peabody 
Museum, Yale University, until recently, when it was transferred to 
the collections of the U. S. National Museum. This form represents 
a new species and genus of Dajide. 
COLOPHRYXUS, new genus. 
Body of adult female, somewhat depressed, with the cephalic part 
projecting in front, and the lateral parts swollen, but not expanded 
anteriorly and not projecting in front of the head. 
Middle part of dorsal surface distinctly segmented into five seg- 
ments. 
Abdomen without any trace cf segmentation and triangularly pro- 
duced posteriorly in an obtuse point. 
The abdomen is without appendages, both uropoda and pleopoda 
being entirely absent. 
There are five pairs of legs, closely crowded around the oral area. 
Oral area small, rounded, and contracted behind. It is bounded 
laterally by the four pairs of coxal plates. 
The male has the head and first segment of the thorax fused. The 
following six segments of the thorax are distinct and subequal. The 
abdomen is indistinctly segmented into about six segments. There 
are no uropoda or pleopoda. 
The type of the genus is Colophryxus novanglia, the description of 
which follows: 
) COLOPHRYXUS NOVANGLI, new species. 
Description of adult female——Body of adult female somewhat 
oval in outline, contracted anteriorly in the cephalic region and 
_ broadening posteriorly. 
PROCEEDINGS U. S. NATIONAL MuSEuM, VOL. XXXIV—No. 1618. 
391 
