Fresh-Water Sponges.— Prof. I). S. Kellioott has arranged the 



fresh-water sponges collected by the late Henry Mill- and lias pub- 

 lished an account of rliem 1 with a kcv to the trenera. Sixteen species 

 are enumerated. Prof. Kellicott regards the region around 

 Buffalo bay as affording ideal conditions for a fresh-water fauna as the 



moderate changes in temperature. 



Parasites of Salmon.— F. Zschokke, 3 after a careful study of the 

 parasites of Salmo salar, the author comes to the following conclusions: 



1. Thirty-three species of helminths infest the salmon; 2. The 

 habits of S. salar differ in different bodies of fresh water, for (a) the 

 absence of fresh water parasites in the Rhine salmon shows that in this 

 stream no food is taken by them, (b) the occasional presence of fresh 

 water parasites in the salmon of the Tay proves that food is occasion- 

 ally taken in that stream, (c) while the very frequent presence of 

 fresh water parasites in the salmon of the Baltic Sea shows that it is 

 the regular custom of this fish to feed in the rivers and brackish water 

 of that region.— C. W. Stiles. 



Anatomy of Stenostoma. — H. X. Ott publishes 3 a preliminary 

 note on the structure of this Khabdocoelous Turbellarian which is 

 essentially like most Microstoraida?, the relations of the muscles of the 

 body walls which is called peculiar, being the normal condition in the 

 Turbellaria. The olfactory pits are imbedded directly in the brain. 

 In fission a constriction of the ectoderm precedes alteration of the 

 entoderm. 



The Systematic Position of Orthelosoma.— L. v. Graaf has 

 had an opportunity to study the type of this genus in the British Museum, 

 described by the late J. E. < iray as a slug. He finds* that, as Leuck- 

 art had previously supposed, this so-called mollusc is in reality a 

 land Planarian, closely allied to Rhynchodesmus. Von Graaf states 



bulletin Buffalo Soc. Nat. Sci., V., p. 99, 1891. 



2 Die Parasitenfauna von Trutta salar, in Centralblatt fur Bakt. u. Parasiten- 

 tunde, 1891, Vol. x, No. 21-25. 



3 Zool. Anz. xv., p. 9., 1892. 



*Zool. Anz. xv., p. 8., 1892. 



