Annul* i >f the South African Museum. 



built and nearly of uniform width throughout, end truncated, with 

 the hind corner obtuse-angular ; supra-anal prominence very slight, 

 infra-anal margin armed with about thirteen pairs of rather coarse 

 denticles, sub-marginal combs well marked, about twelve on each 

 side ; apical claws rather strong, each with a coarse denticle at the 

 base accompanied proximally by a series of small spinules. 



Length of the specimen examined, O9 mm. 



Remarks. The above-characterised form is unquestionably identical 

 with the European species A. -affinis (Leydig), agreeing in every 

 detail exactly with typical specimens taken in Norway. It is one 

 of the largest species of the genus, and is moreover easily recognised 

 by the comparatively narrow oblong form of the shell, the rather 

 produced rostral part, and the structure of the tail-piece. 



Occurrence. A single but well-preserved female specimen of this 

 form, that here figured, was found in an alcoholic sample taken by 

 Dr. Purcell from a pond in the Cape Flats, and kindly sent to me for 

 examination. 



Distribution. Throughout Europe, Central Asia, Siberia, Greenland, 

 North and South America, Azores. 



30. ALONA HARPULAKIA, n. sp. 

 (Plate XXXIX, figs. 2, 2 a,) 



Specific Characters Female. Shell, seen laterally, oval quadrangu- 

 lar in outline, being almost transversely truncated behind ; dorsal 

 margin abruptly curved in the cervical region, hind edges of valves 

 nearly straight, with the upper corner well marked, the lower rounded 

 off. Head rather procumbent, with the rostral corner less prominent 

 than in the preceding species. Surface of valves sculptured with 

 regular, somewhat distant longitudinal striae. Ocellus scarcely 

 smaller than the eye, and located at about midway between it and the 

 tip of the rostrum. Antennulse nearly extending as far as the latter. 

 Tail-piece comparatively short and obtusely truncated at the end, 

 with the hind corner rounded off ; supra-anal angle well marked ; 

 infra-anal margin with about eight pairs of very small denticles, sub- 

 marginal combs very delicate but distinct, about twelve on each side, 

 apical claws with the basal denticle rather slender. 



Body pellucid with a slight greenish tinge. 



Length of shell reaching 0'55 mm. 



Remarks. This form is closely allied to the New Zealand species, 

 A. eucostata, Gr. O. Sars, but is of larger size, and moreover differs in 

 the somewhat more distant and less strongly marked striae of the 



