30 Annals of the South African Museum. 



1901. Polycheles, Alcock (not Heller), Catal. Indian Deep-sea Crus- 



tacea, Macrura and Anomala, p. 166. 



1902. Stebbing, S.A. Crustacea, pt. 2, p. 35. 



1908. (part), Stebbing, S.A. Crustacea, pt. 4, p. 25. 



1910. Stebbing, S.A. Crustacea, pt. 5, p. 377. 



1912. Kemp and Sewell, Records Indian Mus., 



vol. 7, pt, 1, no. 2, p. 23. 



1914. ,, ,, Selbie, Fisheries, Ireland, Sci. Invest., pt. 1, 



p. 9. 



1916. Stereomastis, de Man, Siboga Exp., vol. 39a 2 , p. 1. 



For assigning species to this genus de Man gives the follow- 

 ing characters : The lateral margins of the carapace are con- 

 stantly armed with fewer than 20 spines ; the median dorsal 

 ridge of the carapace carries a definite number of 4 to 7 spines, 

 the outer angles of the anterior border of the first pleon seg- 

 ment have 2 spines in all the known species except Stereomastis 

 ceratus (Alcock), and the epipod of the third maxillipeds is 

 rudimentary, while on the thoi'acic legs it is a membranous 

 expansion of the base of the podobranch. 



Consequently the species Avhich in 1902 I called Polycheles 

 sculptus, S. I. Smith, should now be named Stereomastis 

 sculptus (Smith). In the general catalogue of S.A. Crustacea, 

 p. 377, 1910, by a misprint the Museum number for this species 

 is given as 182, instead of 152, the former number belonging to 

 the new species of Polycheles here described. 



STEREOMASTIS NANUS (S. I. Smith). 



1884. Pentacheles nanus, Smith, Rep. U.S. Mus., Fish. Comm. for 



1882, p. 359. 



1908. Polycheles nanus, Stebbing, S.A. Crustacea, pt. 4, p. 27. 

 1916. Stereomastis nana, de Man, Siboga Exp., vol. 39a 2 , pp. 2, 4, 20 



Having now examined and in part dissected a specimen little 

 more than an inch in length, with the pleon in good condition, 

 and the other parts fairly so, I do not hesitate to assign it to 

 this species. But the third, fourth, and fifth pleon-segments 

 have the large recurved carinal teeth each surmounted by a little 

 denticle, which is not shown in figures of this species or of the 

 very similar S. andamanensis (Alcock). 



Locality. Table Mountain N. 79 E., distant 40 miles. Depth 

 250 fathoms. No. 70. 



Mr. Selbie in 1914 describes and figures Polycheles nanus 

 (Smith), var. Grimaldii, Bouvier. 



