182 Annuls of the South African Museum. 



1 (J. s.s. "Pieter Faure." 27/8/03 and 20/8/03. (S.A.M. Nos. 

 A2769 and A2770.) 



Specific name in allusion to the comparative absence of teeth on 

 the pleon. 



RHACHOTROPIS ANOMALA u. sp. 



Rostrum subacute, extending as far as the subacute ante ro- lateral 

 angles of head. Eyes absent. 



Peraeon smooth. Side-plate 1 not strongly produced forward, 

 antero-inferior angle acute, side-plate 5 produced backward but not 

 narrowed, ending quadrately. Pleon with only a single dorsal cariua, 

 ending in a small tooth on 2nd and 4th segments only. Postero- 

 lateral angle of 3rd rounded, quite smooth. 



Telson reaching to end of 3rd uropod, tapering but slightly until 

 near apex, cleft extremely short, apices acute, non-dehiscent. 



Both first and second antennae lost. 



Mouth-parts normal ; mandible with the cutting-edge as in 

 B. yrimcddii, secondai-y cutting-edge 6-deutate in left, feeble and 

 tridentate in right, 3rd joint of palp longer than 1st and 2nd 

 combined. 



First gnathopod, palm running into hind margin without break, 

 but defined by two spines (1 large and 1 small) on the margin and a 

 transverse row of 7 spines increasing in length towards the margin, 

 palm setose. 



Second gnathopod lost. 



All the joints of the peraeopods lost except the 2nd joints ; in the 

 5th peraeopod this is narrow-oblong, not at all expanded, postero- 

 inferior angle acute but not produced, hind margin entire and 

 glabrous. 



Uropods, outer ramus of 2nd uropod shorter than inner, rami of 

 1st and 3rd uropods subequal, peduncles and rami smooth, except inner 

 margin of inner ramus of 3rd, Avhich has a few short spinules, inner 

 apex of peduncle of 3rd acutely but shortly produced. 



Length: 10 mm. 



Coloiir : In spirit, pale yellowish. 



Locality: Cape Point NE. by E., distant 36 miles. 650 fathoms. 

 1 nonovigerous 2 . s.s. " Pieter Faure." 15/7/03. (S.A.M. No. 

 A2795.) 



Although the single specimen is somewhat mutilated, it shows 

 quite well characters distinct enough on which to found a new species. 



The species seems to approximate to B. gracilis Bonnier in the 

 dorsal cariuatiou, the telsou and the postero-lateral margin of the 



