32 On Freshvater Entomostraca from Egypt dec. 



(27) Cyclops hyalinus, Rehberg. 



A few specimens found in pools near tlie Pyramids. 



(28) Cyclops emini, Mrazek. 



This Central- African species Avas found in collections from 

 the Blue Nile, but a few specimens were also taken near the 

 Pyramids of Gizeh. 



(29) Cyclops dybowskii, Lande. 



Pools by the Pyramids aud at Dahchour. 



(30) Cyclops planus, Gurney. 



This species, which is common in Algeria and Tanisia, 

 occurred in collections made near the Pyramids of Gizeh and 

 at Kostamueh in Nubia. 



(31) Cyclops varicans, Sa.vs. 

 Zoological Gardens at Cairo. 



(32) Cyclops bicolor, Sars. 



Zoological Gardens and near the Pyramids. 



(33) Cyclops serrulaius, Fischer. 



Specimens of the typical form occurred in the Zoological 

 Gardens, at Lecht, aud near the Pyramids, but the form 

 varius, Lillj., was also found in a pool in the Gardens. 



The distinction between the various fonns of Cyclops 

 serrulaius seems to me of doubtful value. The presence or 

 absence of hairs in the hyaline membrane of the first an- 

 tennae is often exceedingly difficult to ascertain with cer- 

 tainty, and the remaining characters are variable and difficult 

 to estimate. The so-called hairs iu the membrane are, I 

 believe, not hairs, but a striation due to a wrinkling of the 

 membrane, 



(34) Cyclops prasinus, Fischer. 

 Zoological Gardens at Cairo. 



(35) Cyclops phaleratus, Koch. 



One specimen only was found in the Zoological Gardens, 



