186 Dr. Maton's and Mr. Rackett's 
late chiefly to fresh-water and land species of the genera Turbo 
and Htlk\ It is impossible to discover what 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 Comment. Acad. Sc. Imp. Petrop. 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 j/?/o- 
grana 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 Mytilus 
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 
