310 Annals of the South African Museum. 



mostraca raised from dried mud. Chr. Vid. Selsk. Skrifter f. 1895, 

 p. 9, pi. 2, figs. 1-8. 



Specific Characters Female. Carapace, seen laterally, regularly 

 oval in outline, with the spine very short and issuing about in the axis 

 of the body ; dorsal denticles only occupying the posterior half of the 

 carapace. Head of moderate size and slightly carinated, with the 

 fornix quite simple, not exhibiting any projecting corner behind ; dorsal 

 edge evenly curved, front broadly rounded below, inferior edge slightly 

 concaved ; rostrum terminating in a short deflexed point. Eye unusu- 

 ally large. Autennulae small, but distinctly prominent, arising from a 

 rounded fleshy protuberance behind the rostrum. Tail-piece slightly 

 tapering distally and narrowly truncated at the end, with the hind 

 edge a little bulging in the middle ; anal denticles about twelve on 

 each side, and extending to the middle of the piece ; apical claws of 

 moderate size and having the secondary denticles well marked. 



Body highly pellucid, with a faint greenish-blue tinge. 



Length of shell reaching 1'8 mm. 



Remarks. This form, like the following one, belongs to the group of 

 Daphuia generally termed the " pulex group," which agrees with the pre- 

 ceding species in the armature of the caudal claws with distinct 

 secondary denticles, but differs materially in the quite simple fornix of 

 the head. The nearest ally of the present species seems tobeD. obtusa, 

 Kurz., and indeed Dr. Richard is inclined to regard it merely as a variety 

 of that species. It differs, however, conspicuously in the form of the head 

 and in the presence of a well-marked, though short, shell-spine, which 

 is obsolete in D. obtusa, as indicated by the specific name of that species. 



Occurrence. The specimens originally described by the present 

 author were reared from mud taken at Knysua. I have subsequently 

 had an opportunity of examining some additional specimens of the 

 same form found in an alcoholic .sample kindly sent to me from the 

 South African Museum and procured by Dr. Purcell, April, 1896, from 

 a small duck-pond at Salt Eiver, near Cape Town. These specimens 

 exactly agreed with those raised from the Knysua mud. 



The present species has not as yet been recorded from other parts of 

 the world. 



7. DAPHNIA TENUISPINA, n. sp. 

 (Plate XXXI, figs. 2, 2 a, b.) 



Specific Characters Female. Shell very thin and transparent, with 

 the carapace, seen laterally, oval in outline and not defined from the 

 head by any obvious concavity of the dorsal margin, spine very thin 

 and fragile, issuing in the axis of the body and not at all upturned, in 



