ZOOLOGY AND BOTANY, MICROSCOPY, LTC. 655 



most part only one pair in the gut of a single host. The author suggests 

 that the larva forms two heads only, one of which gives rise to a female, 

 and the other to a male. Another reproductive peculiarity is that the 

 spermatozoa do not reach maturity save in the receptaculum of the 

 female. 



Epithelium of Trematodes.* — W. Hein has re-investigated this 

 question, which has been the subject of so much discussion — perhaps 

 more than its importance warrants. He finds in Distomum lanceolatum, 

 and in D. isostomum, a distinct homogeneous cuticula, and a strongly 

 developed ramification of processes from the epithelial cells with 

 abundant anastomoses. In Distomum hepaticam and in Amplnstomum 

 conicum there is an epithelial cell-complex with somewhat less ramified 

 processes, without observed anastomoses, but with a radial striation of 

 the cuticle which is due to very fine processes from the epithelial cells. 

 It seems certain that the four forms investigated exhibit a true epithelium 

 and a cuticle in the strict sense. 



Determination of Human Entozoa.j — Henry B. Ward has written a 

 very useful paper entitled " Data for the Determination of Human 

 Entozoa." Thirty years ago, Leuckart listed thirty species which had 

 been found in man ; Braun's more recent work (1D02) discusses 15 

 Trematodes, 20 Cestodes, 38 Nematodes, besides 30-40 Protozoa. In 

 less than a year after Braun's list, the author added two species to the 

 roll. The first table gives a list, showing the organ infested, the stage 

 of the parasite, the type of parasitism, the geographical distribution, the 

 frequency of occurrence. A second table sums up the embryos of 

 common Nematodes, as to form, size, surface, head, tail, sheath, and 

 parts infected. The paper is full of useful hints, and should be widely 

 circulated. 



Incertse Sedis. 



Notes on Rhabdopleura Normani.J — G. H. Fowler publishes some 

 notes in reply to the criticisms of Conte and Vaney on his views regarding 

 the insertion of the peduncle, the subdivisions of the ccelonie and the 

 notochord. The author substantiates his earlier views, giving a further 

 account of the stalk of the adult, and the anatomy of a bud. Two main 

 conclusions follow from his observations. The notochord in the bud is 

 of ectodermal origin, and the gymnocaulus contains all three embryonic 

 layers. 



Revision of Palaeozoic Bryozoa.§ — E. 0. Ulrich and R. S. Bassler 

 give an account of the genera and species of Palaeozoic Ctenostomata, — 

 a first instalment of a revision of the Palasozoic Bryozoa. 



Rotatoria. 



New Rotifera.|| — Charles Binder, having studied the Pelagic fauna 

 of the small Lac di Bret, between Lausanne and Yevey in Switzerland, 



* Zeitschr. wiss. Zool., lxxvii. (1904) pp. 546-85 (3 pis.). 

 t Trans. Amer. Micr. Soc., xxiv. (1903) pp. 105-38 (4 pis.). 

 X Quart. Journ. Micr. Sci., (xlviii.) (1904) pp. 23-31 (1 pi.). 

 § Smithsonian Misc. Collections, xlv. (1904) pp. 256-94 (4 pis.). 

 || Revue Suisse de Zool., xii. (1904) pp. 149-258 (1 pi.). 



