232 Annals of the South African Museum. 



two forms are found chiefly in the Cape series, but would probably 

 also be found at East London if a larger series was collected. 



HYALE DIASTOMA n. sp. 

 (Plate XXVIII. Fig. 3.) 



$ . Body somewhat iridescent, dorsally rounded. Eyes moderate, 

 subcircular. Side-plate 1 not greatly widened below. Postero-iuferior 

 angle of 3rd pleou segment quadrate, not produced, posterior margin 

 with 3-4 very slight serrations. Telsoii, lobes oblong, apically 

 rounded-truncate. 



First antenna reaching beyond peduncle of 2nd antenna, 2nd and 

 3rd joints subequal, flagellum 12- jointed, with not very dense whorls 

 of short setae. 



Second antenna stout, nearly half length of body, ultimate joint 

 longer than penultimate, flagellum 14- jointed, with dense whorls of 

 long setae (denser and longer on lower surface). 



First gnathopod $ , 2nd joint proximally narrow, distally greatly 

 widening but front apex only feebly lobecl, 3rd not lobed, inferior 

 margin of 4th straight, lobe of 5th not apical and not extending 

 be} r ond 4th, setose along whole margin, 6th oblong, inferior margin 

 distally setose, palm a little oblique, denned by 2 spines, setose, finger 

 matching palm. 



Second gnathopod , 2nd joint with a well-developed rounded lobe 

 on front apex, 3rd not lobed, 6th shortly oblong, palm nearly trans- 

 verse, sinuous i.e., concave near hinge and defining angle, convex in 

 middle, defining angle shortly produced, with 2 spines, finger stout, 

 curved, inner margin sinuous like the palm, concave proximally and 

 distally, convex in middle, so that when finger is closed a more or less 

 circular loophole is left at base of finger. 



First to fifth peraeopods, finger distinctly denticulate, seta on inner 

 apex stout, hind margin of 6th joint of peraepods 4 and 5 smooth, 

 inner margin without serrate spines, hind margin of 2nd joint in 

 peraeopods 3 and 4 smooth, in peraeopod 5 with a few widely spaced 

 setuliferous indents. 



First uropod, 1 marginal spine on outer ranius near apex and 1 near 

 apex and 1 in middle on inner ranius. 



Third uropod, peduncle and ramus subequal. 



Length : 7 mm. 



Colour : Claret, eyes black. 



Locality : Sea Point, near Cape Town. 13/4/14. (K.H.B.) 4 $ . 

 The ? has not yet been recognised. (S.A.M. No. A3039.) 



