not conjoyned at the Mentum^ as isufual in other Ani- 
mals , but parted at a good diftance s upon the receiving 
alargebody^ aS the Membrane here to which they are 
fattened eafily extends , fo by lifting up^ as alfo by bring- 
ing thefe two Bones more to a ftrait line, it muft needs 
confiderably widen the K^Slus of the Mouth : and for this 
caufe too they are made two, not one, for performing 
this motion more eafily. This Articulation * of the Di- # ^ 
toomfwhich is very curiousj with the upper and louver 
Jaw, makes rhofe protuberances of the Head, which we 
likened to that of a Bearded Arrow 3 as do's the Poet , it 
may be upon the fame account as well as its fwiftnefsy 
where he faith 
Jf^umpat & Serpens iter inflitutum. 
Si per obliquum Jimilis Sa^ttee 
Terruit Mannes. 
The lower Jaw of each fide was compofedof two Bones, 
as appears in the Figure , but firmly conjoyned. The 
fore Bone was for recieving the fmall teeth, the hinder 
towards the Articulation grew broad 5 as likewifedid the 
Bone of the upper Jaw anfwerable to this place in the 
lower* But this upper Jaw towards the poyfonous Fang 
divided into two Bones ; One was fattened to the Bone ot 
the poyfonous Fang outwards; the other, which reciev- 
edthe fmall teeth was inferted into the fame Bone more 
inwards. 
The Fertebrcey^ccovd^itig to the whole Figure of the body, 
were fmalleft towards both extreems , and largeft in the 
middle. ^From the Neck to t\it Jnus there were as many 
obferved^cales on the Belly^ vi's{; 168. but from the ^nus 
to the fetting on of the ^ttle 29 more in number than the 
Scales. The former Vertehree had a flat t upright Spine to- f fI|. 8. a: 
wards the back 5 andaflendet ^ round oblique defcend- !b 
ingone inwards to the belly. To each ^^r^^ir^ , befides 
thofe 
