16 Annals of the South African Museum. 



segment 2 slightly rugose, of segment 3 weakly but thickly granular, 

 and of segment 4 finely and densely granular throughout. 



Hands. Inner part of upper surface covered with low, rounded 

 granules, showing a tendency to anastomose ; finger-keel weak, 

 secondary keels nearly obsolete. 



Operculum cordate, somewhat broader than long, emarginate 

 behind but not cleft longitudinally. 



Pectines with 11 teeth, the basal intermediate lamella elongate as 

 in the female of 0. granifrons, the scape being without teeth at base 

 for nearly one-half of its length. 



Measurements in Millimetres. Total length 75 ; greatest length of 

 carapace 12 ; width of carapace 11 ; distance of eyes from anterior 

 median edge 8 ; width of hand 9 ; length of hand-back G^-, of movable 

 finger 9^, of tail 40 ; width of first caudal segment 4^, of fifth caudal 

 segment 3. 



Locality. 11 males and 1 female collected at Port Nolloth, 

 Namaqualand. 



This species is closely allied to 0. granifrons, Pocock ; but in the 

 latter the fourth caudal segment has distinct, granular, median and 

 infero-lateral keels below, with only a few coarse and fine granules 

 between the keels. Further in granifrons the under side of the 

 humerus is nearly smooth, the posterior sternite is weakly granular 

 in the female, and that of the male is much more coarsely granular 

 than in granicauda. In granifrons the number of pectinal teeth 

 varies from 14-22 in the male and from 10-18 in the female. 



OPISTHOPHTHALMUS ATEE, n. sp. 



Male (recently killed, in alcohol). 



Colour of whole animal purplish black ; the teeth of the pectines, 

 the median groove of carapace and the soft skin joining the seg- 

 ments of the limbs white ; the under surface of the terminal tarsi, 

 the basal part of the claws and the spiracles pallid ; the fingers, 

 the base of aculeus and the convexities of the interocular area of 

 carapace dark reddish. 



Carapace as long as the first and second caudal segment and one- 

 third of the third ; its interocular area coarsely granular in the 

 anterior part and in front of the median eye-tubercle, but smooth on 

 the convexities ; sides of the carapace coarsely granular, especially 

 along the borders of the interocular area ; median eyes a little less 

 than a third of the length of carapace from the posterior edge ; 

 median groove distinctly forked in front, white. 



