DESCRIPTION OF A NEW ISOPOD GENUS OF THE 

 FAMILY DAJIDiE. 



I 



B}^ Harriet Richardson. 

 Collaborator, Division of Marine Invertebrates, U. 8. 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 Dajida?. 



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 Oolophryxus novanglice, the description of 

 which follows: 



COLOPHRYXUS NOVANGLI2E, 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. 1 61 8. 



391 



