142 Dr. Maton's and Mr. Rackett's 
was subjoined a dissertation on Small-Pox) the Buccina formed the 
principal subject. The last relates to bivalves: it contains also a 
dissertation on the human calculus. The " Anatomy of the Scallop" 
formed the subject of a distinct paper, published under this title 
in the 19th volume of the Philosophical Transactions, 
FEHR 
wrote a dissertation on the Argonauta Argo, which is printed in 
the Eph. Acad. Nat. Cur. There is a correct engraving of this 
species subjoined to it. 
The same year an academical dissertation on the Purpura was 
published at Upsal during the presidency of 
NORMANN, 
El. Bask being the respondent. This contains a disquisition on 
the purple fish of the antients, but without definitively marking 
any particular species as being employed by them for extracting 
the famous Tyrian dye. A wooden cut is prefixed exhibiting 
three figures, two of which are copied from Jonston (and seem to 
be referable to Murcx Brandaris) and the other from Colunma. 
Some observations in the Eph. Acad. Nat. Cur. by 
+ 
SCII EL HAMMER 
ought, perhaps, to be mentioned here. Two of this author's com- 
munications are on the subject of fresh water shells, and are ac- 
companied by a few figures, which are pretty correctly executed. 
The author pretends to give only a concise account of some spe- 
cies which he had recently noticed, and it is too imperfect to 
merit being referred to. A third communication is entitled " Ani- 
mal in Cochlea minuta depressa degem;" this relates rather to the 
physiology of the animal (a Helix) than to the testaceous covering. 
The 
