Ati.nals of ike Month African Museum. 



Simocephalus australiensis, G. O. Sars. Additional Notes 011 

 Australian Cladocera. Chr. Vid. Selsk. Forhandl. f. 1888 p 15 nl 9 

 figs. 1-5. 



Specific Characters Female. Carapace, seen laterally, obliquely 

 oval or .sul.-rhoinl.oid in outline, being only slightly expanded behind, 

 dorsal margin almost straight in the greater part of its extent, but 

 forming behind an abrupt curve before joining the well-marked 

 posterior protuberance of the shell ; the latter, as also the adjoining 

 part of the dorsal edge strongly denticulated ; posterior edges of valvet 

 somewhat flexuous and very oblique, joining the inferior ones without 

 any intervening angle. Head comparatively small, though, as usual, 

 having the fornix greatly expanded, front sub-angular below, rostral 

 projection abruptly deflexed, and defined from the straight inferior 

 edge of the head by an angular notch. Ocellus small, rhomboid in 

 form. Tail-piece rather broad in its proximal part, with the supra- 

 anal angle obtuse ; anal denticles ten to twelve on each side and 

 rapidly increasing in length distally ; apical claws slender and nearly 

 straight, with a number of distinct denticles at the base. 



Colour more or less dark ochraceous. 



Length of shell reaching 2'8 mm. 



Remarks. This form was rather imperfectly characterised and figured 

 by Dana under the name of Daplmia anstraliensis, and was subsequently 

 more fully described by the present author from specimens raised out 

 of dried Australian mud. It is closely allied to the European species, 

 P. ex8ijin>,,i (de G-eer), from which indeed it only differs in the some- 

 what unlike shape of the posterior part of the shell in adult female 

 specimens. 



Occurrence. I have reared this form in considerable numbers from 

 three different parcels of mud kindly sent to me by Dr. Purcell. The 

 parcels were taken partly from pools in the Cape Flats, partly from 

 swamps in the neighbourhood of Bergvliet, It was also reared from 

 the Knysna mud. 



Distribution. Australia. 



9. SIMOSA VETULOIDES (G. 0. Sars). 

 (Plate XXXII, figs. 1, !,&). 



Simocephalus vetuloides, G. O. Sars. The Cladocera, Copepoda, and 

 Ostracoda of the Jana Expedition. Anuuaire du Must'e Zool. de 

 FAcad. Imp. de St. Petersbourg, 1898, p. 5, pi. vi, figs. 11 and 12. 



Specific Characters Female. Carapace, seen laterally, rounded 

 trigonal in outline, being considerably expanded behind and terminating 



