30 Mr. R. Guiney 07i some Freshwater 



(19) Alonella diaphana, King, var. punctata, Daday. 



A few specimens identical with Dada3''s species A. punc~ 

 tata were taken on Feb. 12, 1907, in the sweet-water canal 

 at Port Said. Alonella punctata has been recorded by Daday 

 from Ceylon, South America, and East Africa, and it seems 

 probable that it is not specifically distinct from A. diaphana. 

 King, and A. davidi, Richard. Sars (1901) has already 

 expressed his opinion that the two latter are identical ; and 

 the description given by Stingelin (1904) of specimens 

 attributed to A. davidi and taken in Java and Honolulu 

 seems to indicate that the group diaphana- davidi passes by 

 intermediate forms into 'punctata. The distinction or other- 

 wise of these forms turns upon the presence and arrange- 

 ment of the cilia and teeth on the postabdomen. The dorsal 

 margin of the postabdomen bears in the punctata form a 

 series of distinct bundles of minute denticles. In A. diaphana 

 and A. davidi these denticles seem to be generally arranged 

 singly, though in A. davidi var. iheringi there is a tendency 

 to arrangement in groups. In Stingelin's specimens from 

 Java and Honolulu the denticles are almost as clearly united 

 into groups as in the true punctata form. 



In A. davidi and A. punctata there are always lateral 

 groups of delicate cilia ; but these are not figured by Sars, 

 and their absence constitutes the only real difference between 

 A. diaphana and A. davidi. I am disposed, therefore, to 

 regard A. punctata and A. davidi as only varieties of 

 A. diaphana, King. 



(20) Dunhevedia crassa, King. 



One specimen found in a pool in the Zoological Gardens 

 at Cairo. 



(21) Chydorus sphcericus, O. F. M. 



Pools by the road to the Pyramids ; Zoological Gardens ; 

 Dahchour. Ephippial females were found on Feb. 15 and 

 March L'5, 1907, and Feb. 22, 1909. 



(22) Chydorus sp. ? (PI. II. fig. 6.) 



The shell of a single decayed specimen of a species of 

 Chydorus was found in a collection made in the Zoological 

 Gardens. 



The specimen appears to resemble Chydorus globosus 

 very closely, but differ*; from it to some extent in the slight 



