The Freak-water Entomostraca of Cape Province. 307 



holic samples kiudly sent to me by Dr. Purcell, the one taken at G-reeu 

 Point Common, the other at Salt River, October 22ud, 1898. 



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

 the world. 



3. DAPHNIA HODGSONI, u. sp. 

 (Plate XXIX, figs. 3, 3 a, b.) 



Specific Characters Female. Carapace, seen laterally, rounded oval 

 in outline, with the spine generally very long and obliquely turned up- 

 wards, issuing somewhat above the axis of the body ; denticles of dorsal 

 edge extending beyond the cervical region and in ephippial specimens 

 of quite an unusual length, almost setiform. Head of moderate size 

 and defined from the carapace above by a slight concavity of the dorsal 

 margin; occipital part more or less produced in a hood-like manner, 

 front scarcely angular below, the anterior and inferior edges being in 

 some cases even quite continuous ; rostrum, as in D. dolichocephala, 

 short and obtuse, with a rather conspicuous scabrosity in front. Eye 

 very large, with numerous refracting bodies. Autennulae about as in 

 D. dolichocephala. Tail-piece, however, differing conspicuously both 

 in form and armature, being comparatively larger, with the posterior 

 dge angularly produced in the middle ; anal denticles well developed 

 and continued on each side of the proximal part by a well-marked 

 lateral series almost extending to the base of the piece ; apical claws 

 comparatively larger than in D. dolichocephala. 



Body highly pellucid, with a faint yellowish or greenish tinge. 



Length of shell (without the spine) reaching 2'5 mm. 



Remarks. This form is allied to D. dolichocephala, but differs con- 

 spicuously in the shape of the head, and more particularly in the form 

 and armature of the tail-piece. It is named in honour of Mr. Hodgson, 

 to whom I am indebted for discovering this handsome species. 



Occurrence. Numerous specimens of this form developed in some 

 of my aquaria prepared with mud from Port Elizabeth, and were 

 watched for several successive generations. The female specimen 

 figured on the plate belonged to the earlier generations. Later in the 

 season the size of the specimens somewhat diminished, and at the same 

 time the form of the head was slightly changed, the occipital part being 

 less prominent. In ephippial females the carapace assumed a broadly 

 rounded form, with the ephippium generally of a very dark colour and 

 edged dorsally with unusually long, almost setiform denticles. The 

 male of this species exhibits a very similar appearance to that of D. 

 dolichocephala, as described in my former paper. 



