( #< ) 
in Frefti Water, EE the Ciftern or Veflel containing the 
Water, F the Scale wherein the Weights to counterpoife 
it were put. 
HI. Three Queries relating to Shells propofed by 
Mr. Samuel Dale, and anfwered by Dr. Mar* 
tyn Lifter. R.S.S. 
The Queries. 
THere are three things among Shells, in which I 
would be glad of Dr. Lifters Affiftance, which 
if you can procure, will be a great Favour, and defire it 
may be done as foon as poffible. 
1. What is the Entalia of the Shops ? ly what Authors 
defer ibed ? under what Names ? and how they differ from 
the Dentalia > 
2. Of what She/1 is the Blatta Byzantina the Opercu- 
JUm ? 
3. There are divers forts of Purpuras among Author s i 
which is that of the Shops ? Likewifb which fort of Buc* 
cina and Umbilici Marini ought to be ufed in the Shops £ 
The Anfoer to the Three Queries^ by Dr, Lifter. 
1. As to the Entalia, I do not remember to have 
feen any tl>kig in the Shops under that Name. The De- 
fcriptions of the Dentalia in Scroder are very faulty, 
and bprti thofe and the Entalia by him fliould feem to 
be the Two Species of Dentalia, which are by me 
figured. The Dentalium being that which is commonly 
*nd in Plenty found about the Ifland of Garnfey, and elfe- 
vvhere 
