Natural Hiftory Ofae ees 
helnftone with its Animal juft contracted, as in the fame Fi- 
gure under the other V eficles, the Top of which is inden 
ed, and appeared not unlike a Goronet: At Whitfable U , 
lately collected a curious Specimen of this Coralline, which 
is reprefented on the Mufcle-fhell, at Figure a, in its natural 
SIZcaae | 
Ne. 17. Corallina confervoides gelatinofa alba, geniculis craft. . 
ufeulis pellucidis. R.S. p. 34. N°. 7, me | 
Silk Coralline. | 
This extreme fine, flender, and tranfparent Coralline, ad-. 
heres, by many minute tubular Threads, like fine Silk, to 
Stones, and other fubmarine Subftances ; thefe Threads unite- 
ing form the Stem, from which proceed many long flender 
Ramifications, with a middle Stalk of a zigzag or alternately 
angled Form: From the Points of thefe Angles, go off very 
minute fhort Branches, whofe Divifions are always two and 
“two, thatis, difpofed in a dichotomous Order. In thefe ap- 
pear thro’ the Microfcope regular Rows of Holes on one Side, 
each furrounded by a Rim like a Socket: Thefe Holes are 
placed proportionably nearer to each other, as the Branches 
_ grow lefs and lefs; which they do till they end in Points. 
At N17, 4, Plate XI. is an exa€& Reprefentation of — 
this Coralline in its proper Proportion: A {mall Branch of 
this is magnified at B; and the fine tubular Threads, which 
are reprefented adhering to a Stone at Fig. d, are magnified 
at Figure D. rots 
The Veficles are of an oval Shape, and open at the Top; ; 
but they are fo exceeding fmall, thin, and tender, that they — 
cannot be preferved without the greateft Difficulty. © f 
In 
