TO SURVEYS ar NATURE. 365 



PINNA MARINA. 



This is of that kind whofe edges are founded ; it is the largeft known, 

 being ufually two feet in length, fometimes more : it attaches itfelf to 

 rocks by long ftrings not unlike filk, which are called hyjjus, and ufed 

 for making fome kinds of fluffs. 



P H O L A D E. 



This clafs of fiielUfifh vary in the. number of pieces which form their 

 fhell; fome have four, others five, and fome eight. 



This figure is compofed of eight pieces, viz. two large ones, D D; two 

 others long and thin E E, placed toward the opening of the lhcll;.a 

 very fmall one indicated by F F, uniting the above ; and a long flip (j 

 adjoining to F, and running down the (hell : bcfide thefc are two others 

 channelled, and running down the internal face of the fhell. This fhell is 

 entirely white ; the two large pieces flightly channelled. 



NAUTILUS. 



This figure reprefents the fhell internally and externally. The cham- 

 bers of the firll defcrve our notice : they are feparated by thin partitions, 

 pierced, each in its centre, by an orifice of communication running 

 throughout the whole. The colour of this fhell is yellowifh, with crofs 

 bands deeper coloured, and almofl brown. 



SEA S iT.A R S 



Are marine animals divided into many points or raysi, but generally 

 five; they are covered by a fkin, more or lefs tough, hard, or leathery.. 

 If one of their rays be broken off, they regain the deficiency in a little 

 time, fometimes growing from the place of the old one, fometimes from 

 one fide of it. — The under face in almofl all kinds is different from the 

 upper, and concave or hollow; while the upper is convex, and moflly 

 ..fmooth, having no channels. . The mouth is in the under face. 



Of the firft of thefe the rays are divided by deep channels, fringed as 

 it were by points, thin and flatted ; the whole of this face is covered by 

 little grains the fize of a' fmall pin*s head. Inhabits moll feas. 



The fecond has much thinner rays, with longer fringes, cylindrical and 

 pointed ; the part between is covered above and below by little thin plates, 

 difpofed like the fcales of a fifti; the centre or body is granulated, ex- 

 tremely finely, both above and below. The colour of this fubjed is 

 . brown. Is fx)und at St. Domingo. 



Fart VI. No. 32. 3 Q^ SEA 



