ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 5? 



prototroch equivalent to that of Phascolosoma. This iu turn is homo- 

 logous with the prototroch of mesotrochal Annelids, which clearly 

 represents the most primitive conditions. The author compares the early 

 development of Sipunculus and Phascolosoma, and suggests that the 

 differences in the structure and fate of the prototroch in the two forms 

 appear to be the immediate result of the presence or absence of yolk. 

 "Reasons are presented for believing that the ancestors of Sipunculus were 

 provided with a yolk-laden prototroch, like that which Phascolosoma now 

 presents. 



Nematohelminth.es. 



New Nematode from Helix.* — A. Conte and A. Bonnet describe a 

 new species, Angiostoma helicis, from the seminal vesicles and genital 

 ducts of Helix aspersa. They found it in most of the specimens examined. 

 The male is small and agile. The form is viviparous, and cannot live 

 or reproduce except in the body of host. 



Descriptions of Nemotodes and Cestodes.f — Yon Linstow gives 

 some notes on a number of parasites from a variety of hosts. There are 

 two new species of Filaria, one of Oxyuris, and one of Bothriomonus. 



Platyhelminthes. 



New Cestode Genus.J — M. Kowalewski describes T atria beremis 

 g. et sp. n., from the intestine of a grebe (Podiceps quritus). It is a new 

 representative of the sub-family Acoleinaj, and it is very different from 

 Acoleus, which comes nearest to it. The proglottides have lateral 

 appendages ; the rostellum is armed on its apex with a crown of a few 

 large hooks, and on its surface with many rings of little hooks. The 

 genital organs are unpaired ; the testes number about seven ; there are two 

 seminal vesicles ; the male genital openings are regularly alternate ; the 

 receptaculum seminis is in the middle line of the proglottis ; the external 

 end of its vaginal canal enters into the next posterior proglottis, and 

 joins there with the receptaculum seminis of this proglottis — thus forming 

 a means for spermatozoa passing from one proglottis to another. 



Abnormal Alimentary System in Opisthorchis felineus.§— Kurt 

 Engler describes a variation in this Trematode. The gut is single for 

 about a third of its length, and lies to the left side, then it divides into 

 two forks to right and left. It seems as if the normal right half had 

 been suppressed. Peculiarities in the position of other organs have 

 followed as secondary results. 



Australian Entozoa.|| — S. J. Johnston gives an account of five 

 species of Holostomidaj, parasites of Australian birds, all of which are 

 described as new. 



* Ann. Soc. Linn. Lyon, 1. (1903) pp. 63-8. 



t Arch, fur Naturgeschichte, i. (1904) p. 297-309 (1 pi.). 



X Bull. Internat. Acad. Sci. Cracovie (1904) pp. 307-9 (2 pis.). 



$ Zool. Anzeig., xxviii. (1904) pp. 1S6-S (1 n>.). 



|| Proc. Linn. Soc. New South "Wales, 1904, pp. 108-16 (3 pis.). 



