ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 417 



lies ventrally close to the egg-menibrane. The gut and schizoccele arise 

 as a result of the melting in of the vacuole cells through cells of the 

 still undifferentiated embryo. 



Trematodes from Canadian Fishes.* — J. Stafford gives an account 

 of fifty-eight of these, a number of which are new genera or species. 

 Of these, the fresh-water fishes yield such a large proportion as to suggest 

 an unworked fauna. 



Cestode with Separate Sexes.j — 0. Fuhrmann describes the male 

 and the female of a remarkable cestode, Dioicocestus acotylus, which was 

 found in Ardeiform and Colymbiform birds, Plegadis guarauna, Podiceps 

 griseigena, and P. dominicus. The male, which differs externally from 

 the female, has double copulatory organs, while the genitalia of the 

 female are single and have no vaginal aperture. In the case of each of 

 the three known species of Dioicocestus, only one male and one female 

 occurred in each host. Perhaps, as the author suggests, one pro-scolex 

 gives rise to two scolices, male and female. But the intermediate hosts 

 are unknown. The peculiar musculature and the absence of a female 

 aperture, force Fuhrmann to refer these remarkable forms to a special 

 family, Acoleinas — short-jointed, thick cestodes with two longitudinal 

 and three alternating tranverse layers of muscles in the parenchyma of 

 the strobila. In D. acotylus there are no suckers, and the rostellum is 

 degenerate. 



Fresh-water Representative of a Marine Genus of Turbellaria.f 

 0. Fuhrmann describes from deep water in the Neuenburger-See an 

 almost colourless Turbellarian, a millimetre in length, with a remarkable 

 chitinous copulatory apparatus. He calls it Hyporhynchus neocomensis 

 sp. n., and its special interest is, that it seems to be a representative of 

 the marine genus Hyporhynchus, differing only in the strong develop- 

 ment of the proboscis and in the absence of chitinous parts in the 

 bursa seminalis. 



Polyzoa. 



Fresh-water Polyzoon from Rhodesia. § — C. F. Rousselet describes 

 a new form, LophopodeUa thomasi g. et sp. n., whose special character 

 appears to be the structure of the statoblasts. These differ distinctly 

 from those of Pectinatella, the only form having features approaching 

 the new type. The statoblasts are elliptical in shape with truncated 

 ends, each bearing normally five spines beset with numerous minute 

 closely set curved hooks. 



Tertiary Polyzoa of Victoria. || — C. M. Maplestone gives a descrip- 

 tive list with synonyms of the species of family Selenariida3, a work 

 which appears to have been much needed owing to the confusion exist- 

 ing in the naming of the members of this group. The paper includes 

 an account of new species, both fossil and recent. 



* Zool. Anzeig., xxvii. (1904) pp. 481-95. 



t Zool. Jahrb., xx. (1904) pp. 131-50 (8 pis.). 



% Zool. Anzeig., xxvii. (1904) pp. 381-4 (3 tigs.). 



§ Journ. Quekett Micr. Club., 1904, No. 54. pp. 45-56 (1 pi.). 



|| Proc. Eoy. Sue. Victoria, xvi. (1904) pp. 207-17 (2 pis.). 



Aug. 17th, 1904 2 c 



