CONTENTS, 



Page 

 Art. I. Memoir of the Life and Writings of the late Profes- 

 sor Blumenbach of Gottingen. |tBy Professor K. 

 F. H. Marx. Concluded from Volume XXX. 

 p. 240, . ... 1 



II. On Gymnorynchus horridus, a new Cestoid Ento- 

 zoon. By John Goodsir, Esq., M.W-S., Conser- 

 vator of the Museums of the Royal College of 

 Surgeons, Edinburgh. Communicated by the 

 Author. With a Plate, . . . 9 



III. On the Building Materials of the United States of 

 North America. By David Stevenson, Esq., 

 Civil Engineer, Edinburgh. Communicated by 

 the Society of Arts for Scotland, . . 12 



IV. On Pelonaia, a New Genus of Tunicated Mollusks, 

 with Descriptions of two Species. By Edward 

 Forbes, Esq., and John Goodsir, Esq., Mem- 

 bers of the Wernerian Natural History Society. 

 Communicated by the Authors. With a Plate, 29 



Anatomy of P. glabra, 30 



Anatomy of P. corrugata, 32 



V. On the Proper Form for a Convertible Pendulum. 

 By Edward Sang, Esq., Actuary, Edinburgh, 

 M.S. A. Communicated by the Society of Arts 

 for Scotland, .... 34 



VI. On some appearances inferred to have been con- 

 nected with the Antediluvian Congelation of the 



