( 727 ) 
onefidcj and rays on the other without a focket ^ fonje aire all 
fuiooth, only h fniall ridge runs round them a little within the 
outward circle, which enters into a fmall furrow anfwcriog to 
it ; fome.areall rmooth,and joyn'd only per harmoniam^ as Mr. 
calls it ; fosue Imhites hold of an equal thicknefs of 
fubftance frotn the center to the circumference ; Ibme are pret- 
ty thick in the circumference , and grow thinner towards the 
center 3 fo that they have concavities on both fides, to which 
convexities in other Tmi&/V^janfwer : Some hold of an equal 
thicknefs half way on the ftone from the outward circle, and 
then grow concave to the center, Mr. Lifier mentions one Jro- 
chite he found of an oval figure,the rays fcarce apparent, and a 
very fmall point in the place of the pith : I have of this fpecies 
with jE/^^w^i of the fame fif thefe, having loft the figure, may 
retain the name of t?ox®" 3)fome of thefe have good large holes 
in the middle, like other trochites 5 but their bore is oval ac* 
cording to the ftone. I have many other Tm^/V^i of this kind^ 
but with tbis difFerencejthat ihefe have no rays^ but are joyn'd 
together only by one ridge which paflTes direfily aiong the mid- 
dle of the ftone the long way , there being a furrow in r he other 
anfwering to it ; thefe have alfo a fmall peck in the middle ma- 
king but very little imprefTion in theftonej and feldom paffing 
through it, though I have of this fort with indifferent holes as 
the other Troshites^ but fuch are commonly pointed at the ends, 
and not carried out with an oval round a^ the others. There are 
fome fingle joynts which are flbap'd with a double oval5that is, 
the oval in the upper part of them ftands clean contrary to the 
oval in their lower part : In fome again the ovals do not ftand fo 
exireamly oppofite to each other,but only the ova! in the upper 
part of the Tmhlte feems a little wrefted from the direft line of 
the oval in the lower part,fo that they ftand bend- ways to each 
otherjike aSt.-^WrwjCV^^ and thereare Entrochi made up 
after this manner ; and I find moft of the oval Entrochi grow 
crooked and twifting- There are of thefe oval kinds of all de- 
grees of thicknefs and thinnefs in their joynts, as are found in 
the round ones, and fo for the bignefs of their circumference, 
their fmoothnefs in their outward circle, and their roughnefs 
lA^ith ridges, knots and branches,the length of the£^/w/&i,their 
lnjuries,&c. 
4.1 come now to the Radix s^of which 1 have one as perfeft 
5 C as 
