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



armed with a series of prominent acute spines, about twelve in number, interspersed 

 with somewhat smaller projections. The posterior border is slightly raised and possesses 

 a double row of acute conical tubercles. 



The eyes are of moderate size and situated close together, the peduncles with a few 

 small tubercles, one of which is terminal in position and acute ; the corneae are oblique and 

 deeply pigmented. The autennular peduncle slightly exceeds the anteunar and the basal 

 joint of the former is elongated. The first joint of the antennal peduncle bears a small 

 spine on its outer and lower surface, the second bears two of larger size in a similar 

 position and one on the superior surface ; the acicle is four-spined and has a basal 

 tubercle ; the flagellum is not quite equal in length to the carapace. The external 

 maxillipedes have the three terminal joints subequal in size, the serrated internal lobe of 

 the ischium is well marked ; the sternum connecting these two appendages is bispinose. 

 The pterygostomial region terminates anteriorly in an acute spine. 



' The chelipedes are subequal in length but the right slightly stouter ; the ambulatory 

 limbs are long and armed with numerous aculeate spines and stiff hairs, especially on the 

 upper and posterior surfaces. The merus of the chelipedes bears two prominent distal 

 spines on the inner border, the carpus also possesses several on its superior surface, the 

 propodus has but few, and the fingers are slightly excavated. The ambulatory limbs 

 have the spines very prominent on the meral, carpal, and propodal joints ; the dactyli 

 are compressed and slightly curved, terminating in black horny tips, with a row of 

 horny spines articulated to the lower border. The legs of the last pair have the terminal 

 joints pubescent. 



The abdomen of the single specimen (a male) has the plates slightly uneven and 

 covered with tufts of bristle-like hairs ; the second segment is armed in a similar way 

 to the carapace. 



The following are the measurements: breadth of carapace 39 mm., length of carapace 

 42 mm., of rostrum 8"5 mm., of right chelipede 70 mm., of first ambulatory limb 98 mm., 

 of last leg 25 mm., of abdomen 32 mm. 



Habitat. — Station 145a, off Prince Edward Island; depth, 310 fathoms; bottom, 

 volcanic sand. Taken along with Lithodes murrayi. 



Paralomis formosus, n. sp. (PI. V. fig. 2). 



Characters. — The carapace is broadly ovate, with the length and breadth subequal, 

 everywhere covered with pearly granulations, which are mostly arranged in groups ; the 

 regions are fairly well marked. The rostrum is composed of three sxibequal spines, the 

 two upper considerably elevated and widely diverging ; the lower almost horizontal. 

 The gastric area is convex, and bears towards its centre a conical and acute spine of large 

 size, with, on either side and slightly posterior, a small tubercle, and two short pyramidal 



