658 THE VOYAGE OF H.M.S. CHALLENGEE. 



First pair of antennae extending to a length equal to the animal. 

 Second pair about half as long again. 

 Pereiopoda long and slender. 



Habitat. — Station 201, October 26, 1874; lat. 7° 3' N., long. 121° 48' E.; near 

 Samboangan, Philippine Islands ; depth, 82 fathoms ; bottom, stones, gravel. Two 

 specimens ; one male and one female. Trawled. 



This species resembles Nothocaris binoculus, but it is large, and has the rostrum 

 relatively shorter and armed with fewer sjjines and more teeth on the dorsal crest. 

 It is free from the dorsal curvature at the third somite of the pleon so conspicuous 

 in Nothocaris rostricrescentis. 



The male is more slender than the female. 



Female. — The carapace is posteriorly rounded on the dorsal surface and free from 

 any trace of a carina until over the gastric region, where the lateral surface is 

 anteriorly compressed, and a well-defined carina suddenly rises into a serrate crest on 

 the frontal region, and projects into a long rostrum that is first depressed and then 

 elevated, and is about one-fourth longer than the carapace. It is furnished with 

 thirteen teeth on the upper margin, arid two small posterior spines on the gastric 

 region (fig. 3, r.c); the posterior five teeth are larger, and the eight anterior, that range 

 from the middle to the apex of the rostrum, are very small and are determinable only 

 by the aid of a lens. On the distal half of the lower margin there are six teeth, 

 somewhat larger than those on the corresponding portion of the upper, but less than 

 those on the dorsal crest. 



The ophthalmopoda are short and pyriform. The ocellus on the posterior surface is 

 small, and its upper margin is in contact with the ophthalmus by a process from the 

 latter dipping towards it. 



The first pair of antennae has the first joint of the peduncle deeply excavate to 

 receive the ophthalmopoda, on the outer side is a flat and sharp-pointed stylocerite, at 

 the base of which, on the outer side, stands a small curved process. The stylocerite 

 suddenly narrows to a sharp point, the extremity of which does not reach beyond that 

 i if the first joint. The second joint is short, and with the third, which is the longer 

 <»f the two, equals the first in length. These support two flagella, of which the 



