WORMS. TESTACEA. ^3. Chiton. 
i6t 
ORDER III. TESTACEA or SHELLS. 
ANiMALs/^i^, of CL fmpleJlruHure, and co- 
vered with a calcareous habitation or jhell. 
53. CHI'tON. Animal inhabiting the fliell a 
Doris } Jhdl corifilling of feveral fegments 
or vaRes difpofcd down the back. 
%'Vaii Shell with 6 plates or valves^ ftriate. 
Scbrcet Concbyt. J. ^.493. teb.giftg. i8i _ , . /• 
Inhabits America! middle fi zed ; blackith-grey with white fpott. 
and dots; vefy finely Rfiatc, the fttis minutely granulate. 
Shell 6-valved; glabrous, oval, fea-gr'een, with a paler 
middle- line above and thin hyaline border; 
Schrat. Einl. in cinch. 1. p. 509. «. 1 8. 
Schrcct. tt. Litterat. 4. p, 4 - •» fiZ' *• 
Inhabits . Shell a little convex. 
Shell 7-vaIved; body tuberculate. 
Schrcet. conchyl. 3 p- 494* 9’ ■f'S' *9* , , 
Inhabits oblong-oval, narrow, with tubercles above 
difpofed in a quincunx ; the Tides cinereous mixed with white 
and marked with brown undulate bands; back, grcenilh with 
a broad deep black band. 
Shell 7»valved, thickly fet with (hort hairs. 
Pmr.. Brit. ZoqI. iv. /. yi- tab. 36, 1. 
Inhabits the fear near Aberdeen! not an inch long. 
^"•>‘atut. Shell 8 valved, ftriate: body a little prickly. 
BarbuPs Shells, p 8 . tab. 
Amir.n acad.%. tah.^, dg. i. 
Murr. ted. p. 40. tab. z, fg. i . 
Rimpf. Mi!/ t. io.f. 4. Edisi. Glean, t. 286, /. B, 
^ebaMap. 2. tab. bi, fig. 4. 
Ch^nm, conch, lO, tab. 173* fZ’ 
z. Chemn. conch, 10. tab I 73 » *^ 9 ’ • , , 
Inhabits dda. Shell tuberculate, oval, rough on the uppef-part, 
with narrow Tubulate red flightly curved unequal prickles ; the 
laft valve Traaller. 
Fa/ci^ 
VOL. IV.— X 
