316 Annals of the. Knttf/i African. Museum. 



Length of shell reaching T5 mm. 



Remarks. This form is allied to the European species C. reticulata 

 (Jurine) ; but is of larger size, and, moreover, distinguished by the 

 very large protuberance issuing from the shell behind, a character 

 which indeed has given rise to the specific name here proposed. 



Occurrence. Several specimens of this form were found in an 

 alcoholic sample kindly sent to me by Dr. Purcell, and taken in 1896 

 from a pond in the Cape Flats. This species has not been reared 

 in my afjuaria. 



13. CERIODAPHNIA RETICULATA (Jurine), var. minor, n. 

 (Plate XXXIII, figs. 2, 2 a, b.*) 



Monoculus reticulatus, Juriue. Histoire des Monocles, etc. 1820 

 p. 139, pi. 14, figs. 3 and 4. 



Specific Characters Female. Carapace, seen laterally, rounded 

 oval in outline, with the posterior protuberance rather slight and 

 issuing far above the axis of the body. Head less erect than in the 

 preceding species, with the frontal part slightly angular behind. 

 Reticulation of shell not very sharply marked, and not so close as in 

 that species ; free edges of valves perfectly smooth. Eye of moderate 

 size. Autennulae resembling in structure those in C. prod net a. Tail- 

 piece with the posterior edge slightly sinuate beyond the middle ; 

 anal denticles eight on each side, the outermost ones somewhat smaller 

 than those in the middle ; apical claws each with six well-marked 

 denticles at some distance from the base. 

 Body pellucid, with a faint yellow tinge. 

 Length of shell reaching O9 mm. 



Remarks. The above-characterised form agrees in all essential 

 structural details so closely with a small variety of C. reticulata 

 occurring rather commonly in Norway and other countries of Europe, 

 that I have found it impossible to distinguish it specifically. I am 

 also now inclined to believe that the two forms previously described by 

 me as C. sublaevis and C. richardi should more properly be assigned 

 to the same species. 



Occurrence. This form was reared in great abundance from a parcel 

 of mud taken by Dr. Purcell from a small pool in the Cape Flats. It 

 was also present in an alcoholic sample procured by that gentleman 

 from the same region, and kindly sent me for examination. 



Distribution. Throughout Europe, central part of Asia, New 

 Zealand, North and South America. 



