A NEW GENUS AND TWO NEW SPECIES OF CRUSTA- 

 CEANS OF THE FAMILY ALBUNEID^E FROM THE PA- 

 CIFIC OCEAN; WITH REMARKS ON THE PROBABLE USE 

 OF THE ANTENNUL.E IN ALBUNEA AND LEPIDOPA. 



By James Vj. Benedict, 



Assistant Curator of Marine Invertebrates. 



During- 1889 the U. S. Fish Commission steamer AJhatross, engaged 

 in explorations off the coast of California and Lower California, in the 

 course of which a considerable amount of zoological material was 

 obtained. Among- the inv-ertebrates transmitted to the U, S. National 

 Museum were three specimens of an anomuran crustacean, of an 

 undescribed genus and species, which are characterized below. I take 

 this opportunity to describe also a new species of Alhunea., based on 

 a single specimen obtained by Mr. C. N. E. Eliot at Samoa. It gives 

 me great pleasure to associate with this species the name of the collec- 

 tor, a well-known officer of the British diplomatic service, and an 

 ardent student of zoology. 



LOPHOMASTIX, new genus. 



Eye peduncle very slender, not articulated in the middle. Antenna? 

 without accessory joint. Flagellum of antenna? rather long, with nine 

 joints, each about two and one-half times as long as broad; joints 

 setose. Antennula? much shorter than antenna?, sparsely setose, mul- 

 tiarticulate. The exopod of the outer maxillipeds has a slender ril)- 

 bon-like second article, the distal end of which bears a long- dense tuft 

 of hair. The carpal and propodal joints of the maxillipeds are broad, 

 the distal article is yqvj much narrower and presents an elongated 

 oval surface. The distal inner margin of the merus is armed with two 

 spines. 



Type. — L. diomedese. 



LOPHOMASTIX DIOMEDEi^, new species. 



The eyestalks are slender, slightl}'. swollen at the cornea. The 

 basal article of the antenna is l)road and pectinate; the following joint 

 is about as broad as long, Avhile the third is very short and seems to be 

 nearly conate with the penultimate, which is long and cylindrical; the 



Proceedings U. S. National Museum, Vol. XXVII— No. 1367. 



