186" Dr. Maton's and Mr. Rackett's 



late chiefly to fresh-water and land species of the geyiera Turbo 

 and Helix. It is impossible to discover Avhat species of shell is 

 the subject of the first paper. 



In the same work, and in the same volume with Schlotterbeck's 

 first paper, we find some account of the Turbo Nautileus, by 



HOFER. 



This account relates chiefly to the animal, considered sepa- 

 rately from the shell, and is illustrated by figures. 



The Comme?it. Acad. Sc. Imp. Fetrop. contain three papers com- 

 municated by 



KOELREUTER, 



who, in the first of these, has described a species of Serpula (found 

 in the White Sea), which he calls tubipora, but which is the JilO' 

 gratia of other writers. The second paper describes Sabella sea- 

 bra, called by this author a Dentalium. Sabella scabra may be 

 considered as a giant among the Testacea, the specimen described 

 by Koelreuter being 4 feet 2 Paris inches long, and 3 lines in 

 diameter at one end, and 6 at the other. There is a figure ac- 

 companying the description in torn. 12. Our author's third paper 

 is of a physiological nature, and relates to the ovaria of Mytilm 

 cygneus. 



The 1st and 2d volumes of the Amusement Microscopique of 



LEDERMULLER 



contain some good coloured figures of minute shells, of which it 

 is only to be lamented that the author has not given a more sci- 

 entific description. 



The anatomy and physiology of the Vermes were, at this period, 

 subjects of more general interest than ever. The progress of 



discovery 



X 



