The Pedtculus C<eti Boccotri , who, for ought I know, was 
the firft char mention’d it, in his Recherches &Obfervations 
Naturelles. His Defcription of the Shell is better than the 
Figure he giveth of ir. [ prefume to give, yon my Re- 
marks upon it for want of better, which I muft in treat 
you to take in good part. 
The Shell approacheth to a Sexangular Figure, and con* 
fifteth of one Valve, in which point it differeth from all 
the Balani I have feen: it hath no Spiral Circumvolutions 
nor Apex, but itopeneth at bothends^ the Orifice of the 
upper end is narrower, and it is through it chat it puts 
forth its Cirrhi or Brachia, The Orifice of the lower 
end is much broader, and the Animal is lodged in it. 
The lower is divided, as Boccone obferveth, into 18 Lines, 
which are railed, 12 of them are fimple and ftraight, and 
the other 6 are branched : The laft are fo placed, that two 
ftraight Lines are betwixt each of them. There is a cavitv 
betwixt all of rhem, in which the Cirrhi or Arms of the 
Animal are probably placed, tho in this fubjeft they hood 
in the middle of the upper part of the Shell, with their 
ends contracted as the Figure flieweth them ^ for the upper 
Orifice is deeper than the lowe^. They were altogether 
within it, but weraifed them with the Leg of a Compafs 
to the pofture that they appear in the Figure, There is* 
an opening from the under part to the upper, by which' 
thefe Cirrhi mount from the Head of the Animal The 
Orifice of the upper part is narrow below, but wide in the 
middle, and then again contracts fomewhat. The Body 
of the Shell is Convex 5 it hath 6 divifions, each confiding 
of 4 Tubes extuberant 5 which are narrower at the upper 
end, but grow fenfibly wider towards the lower end : 
The utmoft of thefe Tubes are narrow, the middle are 
broader, all of them have Stri£ crofling them * the di* 
(Vances betwixt the parts of them are fmooth and appear 
hollow^ the Superficies of them are wider at the top and 
grow narrower fenfibly towards the bottom. All the 
