254 SUMMARY OF CURRENT RESEARCHES RELATING TO 



comparative anatomy of the insect-mouth, but occur in typical form 

 in the sub-order [schnocera of the Mallophaga. This corroborates 

 Mjoberg's view that there is an intimate phylogenetic relationship be- 

 tween Anoplura and Mallophaga. 



*• Crustacea. 



Persistent Parthenogenesis in Daphnia.* — A. M. Banta notes that 

 a hundred generations of Daphnia pulex have been reared partheno- 

 genetically without sexual forms appearing at any time. There was no 

 evidence of decreased vigour or loss of vitality, and it appears that there 

 is not a necessary sexual cycle in this Daphnid. The facts corroborate 

 the conclusion that the sexual cycle in Daphnia is not an inherent, 

 necessary thing, but that it is determined by external conditions. 



Remarkable New Cirripede from the Chalk. f — T. II . Withers 

 described from the Chalk of Surrey and Hertfordshire a remarkable new 

 ( 'irripede, Proverruca sp. n., occupying a position somewhat intermediate 

 between Pollicipedidae and Verrucidae, but included as a primitive 

 Verrucid. A rostral-latus and a carinal-latus are present on the rostro- 

 carinal side, and there are no interlocking ribs developed on any of the 

 valves. 



Parasitic Eucopepoda from Tanganyika. J — W. A. Cunnington 

 gives an account of three new species of Lemseocera — the only genus of 

 Lernasids which is known to occur parasitically on fresh- water animals. 

 It seems that the fishes of fresh-water are relatively seldom the prey < if 

 parasitic Eucopepoda. Large numbers of fishes were examined on the 

 Third Tanganyika Expedition, and on only two were such parasites dis- 

 covered. Representatives of the Argulidaj, on the other hand, were 

 taken eighteen times. In ponds and crowded conditions the number of 

 parasites may, of course, be greatly multiplied. 



Annulata. 



Studies on Polychsets.§ — The late Lewis N. (I. Ramsay discussed 

 the relationships of the closely allied genera, Ceratocephale and Tylo- 

 rhynchus, the former being, so far as known, confined to the Atlantic, 

 the latter to the Pacific Ocean. In Tylorhynchus the parapodium lacks 

 the neuro-ligule, the neuro-cirrus is normal, and the eyes are present ; 

 in Ceratocephale the ueuropodium bears a well-developed ventral ligule 

 as well as the setigerous lobe, the neurocirri are double, and eyes are 

 absent. The conclusion is expressed that the two genera should be 

 kept distinct. 



* Year-book, Carnegie Inst. Washington, xiii. (1914) p. 131. 

 t Proc. Zool. Soc, 1914, pp. 945-53 (1 pi. and 1 fig.). 

 % Proc. Zool. Soc, 1914, pp. 819-29 (1 pi. and 1 fig.). 

 § Proc. Zool. Soc, 1914, pp. 231-5. 



