238 Surg.-Capt. A. Alcock on 



the inner angle of each orbital notch ; the lateral margins are 

 spinate and very thickly setose, the spines numbering about 

 31, namely 8 + 5 in front of the cervical groove and about 18 

 behind it ; the border of the cervical groove is strongly 

 spinate and the gastric region is delimited on each side by a 

 row of four large spines ; the dorsal sublateral crests are quite 

 straight and parallel with the lateral margins, each crest 

 having about eighteen strong serrations, and the usual ventral 

 branchial ridges are sharply serrated. 



The abdominal terga, like the pleurae, have the surface 

 more or less covered with bead-like granules or globules and 

 setose, the edges of most of the terga being spinate and of the 

 pleura3 coarsely toothed ; all the terga, including the telson 

 in its anterior part, are carinated, the carina of the first being 

 indistinct, those of the second to the fifth inclusive cul- 

 minating in large procumbent spines, that of the sixth being 

 longitudinally grooved or double, with the edges beaded, and 

 that of the telson being obtusely dentate; the pleurae are 

 traversed each by a salient beaded midrib. 



The orbital notches are very deep and are quite peculiar in 

 that the edges, which are rough throughout and strongly 

 spinate in all but the front half of their inner edge, meet 

 across tlie ophthalmic peduncle so as to completely divide 

 each notch into two parts, namely into a shallow notch in 

 front, behind which the posterior portion of the ophthalmic 

 peduncle is completely isolated ; the ophthalmic peduncles 

 have each a strong blunt spine at the frontal level. 



The basal joint of the antennules has two spines at its 

 antero-external angle, and the scale is a good deal longer 

 than the antennal scale, both ending in spines. 



All five pairs of thoracic legs are perfectly chelate in the 

 female, but in the male the dactylus of the fifth pair is much 

 longer than the pollex. 



The length of the great chelipeds is less by half the length 

 of the telson than that of the body ; the meropodite has both 

 edges spinate, the upper most markedly so ; the carpus has 

 the upper edge faintly serrate and has two terminal spines, 

 one above, the other below, and the propodite in its palmar 

 portion has both edges spinate. 



The first pair of abdominal appendages have tlie usual 

 forms and modifications of shape in both sexes — in the male 

 spoon-shaped, in the female uniramous and setose. 



Colour in life ])ink. 



Three males and a female from Station 115, 188 to 220 

 fathoms. 



The measurements from rostrum to tip of telson in the 



