936 THE VOYAGE OF H.M.S. CHALLENGER. 



second pair shorter than the rami ; the outer ramus much shorter than the inner, which 

 reaches nearly as far back as the inner of the first pair ; these rami also have spines on 

 the eaVes ; peduncles of the third pair much shorter than the rami, which are long, the 

 outer rather shorter than the inner, and in the female considerably so ; the margins carry 

 spines, more in the male specimen than in the female. 



Telson longer than the peduncles of the third uropods, though not quite reaching the 

 tips of them, a little longer than broad, very little narrowed distally, with a distal arched 

 emaro-ination, not as deep as wide, forming two triangular apices, a little serrate on the 

 outer margins ; the arch of the emargination is smoothly rounded in the female, but in 

 the male is (perhaps accidentally) rather angular. 



Length. — The specimen, in the position figured, measured, exclusively of the antennae, 

 a little more than a quarter of an inch. 



Locality. — Station 145a, off Marion Island, December 27, 1873 ; depth, 310 fathoms; 

 bottom, volcanic sand. Two specimens, male and female. Dredged. 



Remark. — The specific name refers to the shape of the telson. 



Genus Harpinioides, n. gen. 



Upper Antennas longer than the lower, peduncle short, secondary flagellum minute. 



Mandibles with elongated cutting-edge, the spines of the spine-row numerous, the 

 second joint of the palp wide, the third equal in length to the second. 



First Maxillse with nine spines on the outer plate. 



Maxillipeds with the inner plates reaching scarcely beyond the base of the first joint 

 of the palp, the outer plates narrow, fringed on the inner margin with numerous slender 

 spine-teeth ; the finger of the palp narrow. 



The First and Second pairs of Gtiathopods alike, the wrist short, the hand long, 

 tapering, subchelate. 



The Third, Fourth, and Fifth Per&opods with the first joint in each broadly dilated ; 

 the Fourth longer than the Third, the Fifth than the Fourth. 



In the First and Second Uropods the outer ramus shorter than the inner, in the third 

 pair the rami lanceolate, subequal, longer than the peduncles. 



TJie Telson not shorter than the peduncles of the third uropods, not cleft, slightly 

 emarginate. 



The generic name is derived from that of the genus Harpinia, Boeck, and eTSos, 

 likeness ; it refers to the curious resemblance which the type-species shows in the form of 

 the mandibles and maxillipeds to the genus in question ; the gnathopods are peculiar, not 

 indeed alien to Harpinia, but not attracting attention by any special resemblance to it. 

 On the other hand the antennae, peraeopods, and pleon connect the genus closely with the 

 Atylidse. 



