﻿South African Crustacea. 29 



in which he agi-ees with the late Mr. C. M. Selbie, that this 

 form is distinct from Alcock's P. heaumoniii and the P. granu- 

 latus, Faxon. In common with Miss Eathbun, those authors 

 regard P. heaumontii as a synonym of Faxon's species. 



In 1908 I gave some particulars of a male and of a female 

 specimen, both taken in localities near to that from which the 

 female now figured was obtained. The measurements are very 

 similar, the length from the base of the rostral spines to apex 

 of telson being 130 mm. ; but from the foremost lateral spine 

 to a point parallel with the tip of the telson the interval is 

 138 mm. ; greatest breadth of carapace 61 mm. ; the length of 

 the telson detached is 26 mm. The longer flagellum of the first 

 antenna measured 78 mm., its companion about 22 mm. ; the 

 flagellum of the second antenna was 70 mm. long. 



The lateral teeth of the carapace form sets of 7, 4, and 20 

 or 21 : at the base of the rostral pair there is a small unpaired 

 denticle ; in various parts of the surface there are small teeth 

 some of which show a symmetrical arrangement, but for many 

 this is doubtful, because of the short pubescence which conceals 

 them. This dark felt puts the carapace in strong contrast with 

 the smooth polished pleon. Of this the first four segments have 

 each a small forward-pointing carinal tooth, the fifth a carinal 

 elevation, while the sixth is quite devoid of a carina. The telson 

 has a pair of converging ridges, distant both from the base and 

 the apex. 



The third maxillipeds have a well-developed, but slender, epipod. 



In the first peraeopods the third joint is 24 mm. long, the 

 fourth 43 mm., the fifth 30 mm., the sixth 50 mm., and the 

 finger 25 mm. The denticles on the distal half of the fourth 

 joint are in this specimen very small, successively diminishing. 

 In the fifth peraeopods the fifth and sixth joints and the finger 

 are longitudinally carinate, with long setae springing from the 

 carina ; the process of the sixth joint is feebly carinate, and its 

 tip meets that of the finger. 



Numerous small ova were attached to the pleopods of this 

 specimen. 



Locality. Cape Point Lighthouse approx. NE. 40 miles; 

 depth 560-700 fathoms. No. 182. 



Gen. STEREOMASTIS, Bate. 

 1888. Stereomastis, Bate, Eep. Voy. Challenger, vol. 24, pp. i, 154. 



