294 Transactions of the Society. 



narrow lateral arms at the anterior end. The spermatophores are 

 so attached that they diverge obliquely from each other like the 

 two arms of a V. 



Length : to base of furca * 7 mm. ; to end of furca ■ 755 mm. 



This species resembles C. diaphanus in some respects, but 

 appears to be quite distinct from it in the form of the body, 

 antenna, and receptaculum seminis. 



It occurred rather frequently in Biskra and at Oued Tindja in 

 Tunisia. 



Cyclops strenuus Fischer. — Found only in the Jardin d'Essai in 

 Algiers and in a large pond at Oued Tindja. 



Cyclops bicuspidatus Claus. — Common in small pools at Algiers, 

 Biskra, and near Tunis, in water both fresh and salt. But, 

 whatever the salinity might be, the specimens found always 

 belonged to the variety C. lubbocki Brady, with fourteen joints in 

 the antennas. 



Cyclops bisetosvs Kehberg. — Found in four irrigation pools in 

 Biskra. One female was noticed with eighteen joints in the 

 antenna. 



Cyclops viridis Jurine. — Palm irrigation pools in Biskra, in 

 pools by the conduit of Oumach, and at Oued Tindja. 



Cyclops albidus Jurine. — This seems to be a rare species, and 

 was only found in the Jardin d'Essai in Algiers and in Chott 

 Tinecilt in the high plateau. 



Cyclops serrulatus Fischer. — A few immature females of this 

 species were found at Oued Tindja in a marsh by the river. They 

 appear to belong to the form C. varius Lillj., but cannot be identi- 

 fied with it with certainty. 



Cyclops prasinus Fischer. — Taken in the Jardin d'Essai in 

 Algiers and in pools in Biskra and Sidi Okbar. 



Cyclops diaphanus Fischer. — This is by far the commonest 

 species of Cyclops found. It occurred in palm irrigation pools at 

 Biskra and Sidi Okbar, in large ponds at Biskra, in the Elver 

 Seybouse at Hammam Meskhoutine, at Carthage, Sidi Athman, 

 Oued Tindja, and in brackish water at Tunis (Lake Sedjouma). 



Canthocamptus pygm/eus Sars. — A number of individuals of 

 this species were collected in a tiny trickle of water at Hammam 

 Meskhoutine. 



Canthocamptus minutus 0. F. Muller. — A single female and a 

 male were found in a pond at Oued Tindja. While obviously 

 belonging to this species, these specimens differ from the type in 

 the possession of an exceedingly large spine on either side of the 

 last segment of the abdomen. 



Canthocamptus trispinosus Brady. — A few individuals were 

 collected in a marsh at Oued Tindja. 



Marshia blanchardi Kichard. — This species occurred in very 



