( »p» ) 
V. An Account of a Book^ intituled, Jo. Ph. 
Breynij, M. D. &c. Diflertatio Phyfica 
de Toyhhalamiis, nova Teftaceorum clafle, 
See. Gedani, 1732, 4^, or a Thyjical Differ - 
tation of a new Ciaft of Shells, which he files 
Bolythalamiums , <jrc. with fourteen Copper Blates. 
By Richard- Middleton Maffey, M. D. 
F. Be S. and Hon. F. C. Med. Lond. 
I N the firfl: Chapter he difeourfes of Shells in ge- 
neral, and premifes a Method of placing them 
in different Claffes, which he reduces to eight, viz. 
Tubulus , Cochlidium , Tolythalamium , Lepas , Con- 
cha, Conchoides, Balanus, and Echinus. 
The fecond Chapter treats of Tolythalamiums , 
which he defines a Tabulous Shell divided into fe- 
veral Cavities, conical, ftraight, or regularly Spiral, 
with a Pipe, or Canal, paffing through each Cavity. 
This again he lubdivides into four, viz. 1. Ortho- 
ceras, 2. Lituus , 3. Ammonia, and 4. Nautilus. 
The third Chapter treats of the Nautilus and 
NautiliteSy which laft he takes to be a Stone form’d 
under Ground in the Cavities of the Nautilus. 
The fourth Chapter is of the Ammonia and Am- 
monites. - , 
The fifth is of Che, Lituus (which he names from 
fome Refemblance it has to the Lituus , or Crofter, 
which 
