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



lias in any case received general acceptance by later wi-iters. Mr. E. J. Miers has described 

 an allied genus Pomatocheles from the Japanese seas, found living in the shells of a 

 Dentalium, distinguished chiefly by the form of its chelipedes (the fingers of which move 

 in a horizontal plane), the shape of the ocular peduncles and of the carapace. 



Glaucothoe carinata, n. sp. (PL IX. fig. 1). 



Characters. — The anterior part of the carapace is slightly convex from side to side, 

 and produced into a broad and subacute median projection situated between the bases of 

 the ocular peduncles. The frontal process possesses a sharply defined median carina, 

 which after passing a short distance back, loses itself on the carapace ; a slight lateral 

 ridge also diverges from each margin of the rostrum, and between this and the median 

 carina a depression exists. The posterior part of the carapace is considerably broader 

 than the anterior portion, and a somewhat shallow cervical groove separates the two. 

 The cardiac area is narrow and triangular ; the branchial area is convex. 



The ocular jjeduncles are of large size, almost equalling half the length of the anterior 

 part of the carapace ; the cornese are broad and dilated, and each peduncle is constricted 

 towards its middle. The antennular peduncle exceeds the eye-stalk by half the length 

 of its terminal joint. The antennal peduncle is provided with a small pointed acicle, and 

 the terminal joint is long and cylindrical, slightly exceeding the eye-stalk. 



The chelipedes are equal in size, with the joints smooth and polished, though clothed 

 with a few short silky hairs ; the propodus is more than twice the length of the carpus, and 

 considerably swollen from side to side, the outer surface is rather more pubescent than 

 the remainder of the chelipede ; the fingers are not equal in length to the hand, and 

 even when closed a slight hiatus exists between their opposed edges, on the margin of which 

 one or two obscure teeth can be made out ; their apices are slightly corneous. The ambu- 

 latory limbs are smooth ; the dactyli are long and moderately curved, ending each in a 

 small back claw, two minute spinules and a few hairs are present on their posterior margins. 



The abdominal segments are smooth ; the telson is oblong and narrows slightly 

 towards the apex, which presents a slight median emargination, the lateral borders are 

 straight and more than twice as long as the breadth at the apex. The appendages of 

 the penultimate segment are broad and symmetrical. 



The single specimen taken is an apparently adult male, with the following measure- 

 ments : — Length of body 10 mm., of chelipede 6 mm., of first ambulatory leg 10 '5 mm., 

 of ocular peduncle 1 '3 mm. 



In Glaucothoe pero7iu, Milne-Edwards, there is no median frontal projection, and the 

 chelipedes are unequal. In Glaucothoe rostrata, Miers, with which the Challenger 

 specimen agrees in many respects, the rostrum is not carinated superiorly, the dactyli of 



