Crustacean Fauna of South Africa. 265 



nently projecting lobe, 6th equal to 4tli and 5th together, elongate- 

 oval, palm distinguished from inferior margin only by 2 spines and 

 by its minute denticulatiou, inferior margin with 3 spines and several 

 setae, finger evenly curved, equal to palm ; in $ shorter, 5th joint 

 stouter, inferior margin of 6th with only 1 spine at junction with 

 palm, otherwise as in $ . 



Second gnathopocl, in $ elongate, 2nd joint curved, 3rd lobed on 

 anterior margin, 4th not or scarcely apically produced as in I. anguipes, 

 5th with a narrow lobe projecting backwards below 4th, 6th elongate, 

 3 times as long as broad, curved, inferior concave margin nearly 

 parallel with upper convex margin and bearing long setae, a broad, 

 truncate, apically bifid and denticulate tooth near the hinge, finger 

 curved, not quite reaching base of 6th, inner margin near the hinge 

 with 2 semicircular excavations to receive the bifid tooth on the palm ; 

 in the immature the hand is not so long, inferior margin straight, 

 not convex, 2 teeth instead of one apically bifid near the hinge, finger 

 not doubly excavate ; in <j> similar to 1st guathopod and not larger. 



First and second peraeopods as in J. anguipes. 



Third to fifth peraeopods not slender, 2nd joint expanded, hind 

 mai-gin most convex in 5th peraeopod, postero-inferior angles rounded. 



First and second uropods, outer ranius shorter than inner, rami 

 shorter than peduncle in 1st uropod, inner ramus subequal to peduncle 

 in 2nd uropod, apex of peduncle of 1st with acute spine. 



Third uropod reaching very little beyond end of 2nd uropod, rami 

 very small, equal to apical width of peduncle, inner ramus narrow, 

 outer broad at base, distal half suddenly contracted, apex minutely 

 hooked, 3 denticles on upper margin. 



Length : 3 mm., <$ a trifle over 3 mm. 



Colour : $ usually whitish with a broad dorsal stripe of claret, 



? usually greyish or claret, pleou sometimes lighter or with irregular 



patches of black, whole body, side-plates and appendages with minute 



circular black pigment specks, but the two types of coloration are not 



confined to the respective sexes. 



Locality : Buffel's Bay (False Bay). 28/9/13 and 1/3/15. (K.H.B.) 

 c? c? an d ovigerous $ <j> ; Sea Point, near Cape Town. 26/2/14. 

 (K.H.B.) 1 ovigerous ? . (S.A.M. Nos. A2533, A3290, and A2922.) 



Geogr. Distribution : Widely distributed in the North Atlantic 

 (incl. Arctic Ocean) and adjoining seas. 



The chief differences between these specimens and the typical form 

 lie in the shorter and more rounded telson, which is somewhat similar 

 to that of I. commensal is Chevreux, and in the 2nd guathopod of the 

 male. 



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