WORMS. TESTACEA. 53. Chitoa. t6: 
ORDER I. TESTACEA or SHELLS. 
ÁAxrMALs foft, of a. fimple ftrutiure, and co- 
vered with a calcareous habitation or fhell. 
53. CHITON. Animal inhabiting the fhell a 
Doris: /Ael4 confifling of feveral fee ments 
or valves difpofed down the back. 
Higpidas, Shell with 6 plates or valves, ftriate. 
Scóret Conchyl. 3. p. 493. tab. 9, fig. 18. 
Inhabits America; middle fized ; blackifh-grey with white fpots 
and dots; very finely ftriate, the firiz minutely granulate, 
Thalafinus Shell 6-valved, glabrous, oval, fea-green, with a paler 
middle-line above and thin hyaline border. 
Schrat, Einl. in conch. 3. p. $09. n. 18. 
Schrat. n. Litterat. 4. p. 4. tab. V, fig. 1. 
Inhabits ———. Shell a little convex. 
" dulercu]g- Shell 7-valved: body tuberculate. 
bs. Schret. conchyl. 3. b. 494. tab. Qs figs 19. 
Inhabits America; oblong-oval, narrow, with tubercles above 
difpofed in a quincunx ; the fides cinereous mixed with white 
and marked with brown undulate bands; back greenifh with 
a broad deep. black band. 
*Crinitus, Shell 7-valved, thickly fet with fhort hairs. 
Penn, Brit. Zool. iv. p. 71. tab. 36, Ag. 1. 
Inhabits the fear near Aberdeen; not an inch long. 
Aculeatus. Shell 8-valved, ftriate: body a little prickly, 
Barbut's Shells, p 8. tab. 1, fig. 2. | 
Aman acad. 8, tab. 5, fig. Y. 
Murr. teh. 5. 40. tab. 2, fig. 1. 
Rumpf. Muf. t. 10. f. 4. Edw. Gleag. t. 286, f. B. 
Seba Muf. 2. tab. 61, fig. 4. 
Chemn, conch. 10. tab. 1753, fig. 1692. 
N 
- Chemn. conch. 10 tab 173, fig. 1691? : 
Inhabits da. Shell tuberculate, oval; rough on the upper-past, 
with narrow fubulate red flightly curved unequal prickles; the 
Jaft valve fmaller. 
VOL. 1V.—X Pais 
