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 



NORM ANN, 



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 d3'e, A wooden cut is prefixed exhibiting 

 three figures, two of which are copied from Jonston (and seem to 

 be referable to Murex Brandaris) and the other from Columua. 

 Some observations in the Eph. Acad. Nat. Cur. by 



SCIIELHAMMER 



ought, perhaps, to be mentioned here. Two of this author's com- 

 munications are on the subject of fresh Avater shells, and are ac- 

 companied by a few figures, Avhich 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 degens ;" this relates rather to the 

 physiology of the animal (a Helix-) than to the testaceous covering. 



The 



