242 Surg.-Capt. A. Alcock on 



lateral margins are slightly setose and spinate or serrate ; 

 there are 6 + 2 spines in front of the cervical groove, and 3 

 succeeded bj some not verj distinct serrations behind it ; 

 within the cervical groove the gastric region is delimited on 

 each side by a single spine ; the dorsal sublateral (branchio- 

 stegal) ridges are sinuous, the anterior half being smooth and 

 very faint, the posterior half being more distinct and slightly 

 serrate. 



The abdominal terga are smooth ; the first is veiy incon- 

 spicuously carinated, the second, third, and fourth are indis- 

 tinctly carinated, except in front, where tliere is a small 

 procumbent spine on each, but the fifth has a very strong 

 carina, which culminates in a monstrous spine reaching 

 beyond the anterior margin of the fourth ; the sixth tergura 

 has a simple double carina ; the anterior part of the telson is 

 also carinated. The pleurse are smooth, their setose margin 

 is very faintly and distantly denticulated. 



The orbital notches are narrow, very deep, nearly the same 

 width throughout, and smooth-edged ; the ophthalmic 

 peduncles are perfectly smooth. The basal joint of the 

 antennules has two spines at the antero-external angle; its 

 scale is not much larger than the antennal scale, both ending 

 in spines. 



All five pairs of thoracic legs are chelate (in the female). 

 The great chelipeds exceed tiie body in length ; the mero- 

 podite is perfectly smooth, except for a subterminal tubercle 

 on the upper edge ; the carpopodite has two distinct sub- 

 terminal spines, one above, the other below ; the propodite is 

 smooth, except for a subterminal spine above. 



The first pair of abdominal appendages have the usual 

 form in the female. 



An ovigerous female from Station 114, 922 fathoms, 

 measures 79 millira. in the middle line from rostrum to tip of 

 telson. 



The characteristic feature of this species is the huge spine 

 on the fifth abdominal tergum. 



Family Parapaguridae. 

 Parapagurus, S. I. Smith. 



72. Parapagurus ahyssorum^ A. Milne-Edwards, Henderson. 



Parapagurus abijssonan, A. Milne-lCdwards, MS. ; Henderson, • Chal- 

 lenger ' Anouiura, p. 87, pi. ix. tisr. '2. 



This species has been frequently dredged in the Bay of 

 Bensral between 1644 and 1997 fathoms. 



