C i8t ] ' 
the whole Width, and doubtlefs deftin’d for fupport- 
ing fome of the inward Parts of the Head (See Pig. 
4 . ^ 0 - 
Sect. XII. 
Thefe two Hemicraniaj connected together by 
Prong Ligaments, and as it were by a fmall Hinge, 
(by means whereof they can dilate without feparate- 
ing) befides their defending the foft Head from ex- 
ternal Injuries, are the Inftruments wherewith the 
Animal gets its Food. For whatever way it turns 
its Head, the raifed and rough Fibres, running either 
length-wife or crofs-wife, always rub off fome of 
the Wood. 
Sect. XIII. 
Thefe Hemicrania carefully removed, the con- 
tained Parts (Fig. 6 ) are laid open to View; but they 
are fo foft, and of fo wonderful a Structure, that the 
Eye, though armed with a Microfeope, can neither 
difeern their true Make or Ufe. Firft, indeed, there 
appears a Membrane enveloping the whole Head j 
in the middle and anterior Part, which is not co- 
vered by the faid Hemkraniaj it appears as if raifed 
by a Tubercle, (Fig. 6. c.) and in that Place it is of 
a red Colour ; but the lower ligamentous Edge firmly 
adheres both to the fmall Procefs (Sect. XI ) and to 
the lower Edge of the Hemicranium. 
‘ Sect. XIV. 
This Membrane carefully feparated and removed, 
(Fig. 7. A.Al) in the middle of the fubjacent Pulp 
you will find a fmall Pear- like Body, perfedly pel- 
lucid, fomewhat protuberant above the other Parts, 
which 
