ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 483 



single, consisting of tine filamentous threads radiating out from the base 

 where the oviduct arises. The vagina opens into an anteriorly placed 

 diverticulum of the vertical water-vascular tube. The uterus consists 

 of a dorsal and a ventral network connected by vertical tubes. The 

 ripe eggs, according to Liihe, are long and spindle-shaped. Beddard 

 also calls attention to the occurrence of a definite lateral uterine pore 

 on some joints of Dasyurotaenia robusta. 



Life-history of Proteocephalus ambloplitis.* — A. R. Cooper gives 

 an account of his observations on the life-history of this Cestode para- 

 site of the Black Bass. A few Plerocercoids occur in the stomach, many 

 in the intestine, liver and gonads. The structure of the Plerocercoids 

 is described. The evidence points to P. ambloplitis having at least 

 two intermediate hosts — the first, some unknown species of aquatic 

 Arthropod ; and the second, either minnow, perch, or the final host itself. 

 A description is given of the egg and oncosphere. 



New Liver-fluke from a Kestrel. f — W. Xicoll describes Platyno- 

 somum acuminatum sp. n. from the liver of a kestrel [Gerchneis tinnun- 

 culus) shot on the west coast of Scotland. It bears a close resemblance 

 to P. deflectens and P. petiolatwn, but is distinct. 



Incertae Sedis. 



New Pentastomids.J — Mary L. Hett describes Poroc&phalus grandis 

 sp. n. from African vipers (Bitis gabonka, B. nasicornis, and Cerastes 

 comutus). In the female the anterior third of the ovary is paired and 

 the organ forms a Y-shaped structure, each arm of the Y passing into 

 the. oviduct of that side. The species resembles P. armillatus Wyman, 

 but the body is relatively thicker, the papillse are differently arranged, 

 the hooks are sunk in a pit and not so wide apart, the space between 

 the two inner hooks is relatively greater, the rings (twenty-two distinct 

 in the female and two or three indistinct, instead of nineteen altogether) 

 are not so sharply defined, the postero-ventral margin of each ring has 

 a slight projection in the median line instead of an indentation, and the 

 anal segment is more obtuse. Another new species, P. globkephalus, 

 from the lung of the Moccasin Snake (Tropidonotus fasciatus), greatly 

 resembles the Indian species P. pattoni, but has more rings and a more 

 nearly terminal anus. Three other species, with two new varieties, are 

 described. 



Rotatoria. 



Transmission of Induced Characters in Asplanchna amphora. § 

 Claude "W. Mitchell and J. H. Powers find that variation in this species 

 is, in last resort, entirely under the control of nutrition : that in character 

 it is deep-seated, pervasive, erratic and sudden— bearing all the ear- 



* Contrib. Canadian Biol., 47th Rep. Dept. Fisheries, Ottawa, 1915, Fasc. ii., 

 p. 177-94 (3 pis.). t Proc. Zool. Sos , 1915, pp. 87-9 (1 fig.). 



X Proc. Zool. Soc, 1915, pp. 115-21 (4 figs.). 

 § Journ. Exper. Zool., xvi. (1914) pp. 347-96. 



