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



First pair of antennae with the flagella about two-thirds the length of the animal, 

 and the flagellum of the second pair rather longer than the animal. 



Ehipidura with the rami long and narrow. 



This species is long and slender. 



Length (female), 63 mm. (2"5 in.). 



Habitat— Station 104, August 23, 1873 ; lat. 2° 25' N., long. 20° 1' W.; Atlantic 

 Ocean, south-west of Sierra Leone ; depth, 2500 fathoms ; bottom, Globigerina ooze ; 

 bottom temperature, 36° - 6. Two specimens ; females. 



Station 106, August 25, 1873 ; lat. 1° 47' N., long. 24° 26' W.; Atlantic Ocean, south- 

 west of Sierra Leone ; depth, 1850 fathoms ; bottom, Globigerina ooze ; bottom tempera- 

 ture, 36°"6. One male, damaged and imperfect. 



Station 205, November 13, 1874; lat. 16° 42' N., long. 119° 22' K; off Manila, 

 Philippines; depth, 1050 fathoms; bottom, blue mud; bottom temperature, 37°. One 

 specimen; female. 



This species differs from Haliporns curvirostris in having the rostrum (which is 

 broken in our selected specimen) straight and horizontal with the dorsal line, and in 

 being armed with eight teeth on the upper margin, of which the posterior two are 

 distant and situated on the median ridge of the carapace. AVith the exception of the 

 teeth on the frontal and hepatic regions, the whole surface of the animal is smooth and 

 polished. 



The cervical fossa is distinct, and the branchial and hepatic regions are denned by 

 well marked lines. 



The ophthalmi are small, being only a little broader than their stalk, which is about 

 half the length of the rostrum and furnished on the inner side with a small blunt 

 tubercle ; they rest in a hollow on the upper surface of the first joint of the peduncle of 

 the first pair of antennas, which is about as long as the rostrum and furnished on the 

 inner side with a short prosartema, and on the outer side with a short stylocerite and 

 a sharp tooth at the distal angle. The second joint is nearly as long as the first, and 

 the third is short, and the three which form the peduncle reach considerably beyond 

 the rostrum, even to twice its length, and terminate in two long slender flagella that are 

 more than half the lena;th of the animal. 



The second pair of antennae carries a scaphocerite that reaches as far as the distal 

 extremity of the peduncle of the first pair ; it is narrow and terminates on the outer side 

 in a subapical tooth. The peduncle supports a slender flagellum that is about twice the 

 length of the animal. 



The mandible possesses a large and foliaceous synaphipod, the second joint of which 

 is more slender than the first, and it reaches as far forwards as the extremity of the 

 peduncle of the second pair of antennae. 



