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150 MOLLUSCOUS A N IM A L S .
C h i t o n S t r a m i n e u s , f. 4 1 ./ . 13. Sowerhj, Zool. Proc. A p r . 1832. p . 104.— Conch.
Illu str. C h ito n ./. 28.
In h ab . F o u n d a t C hiloe.
C h i t o n v e s t i t u s , f. 4 1 ./ . 14. Sowerhy, Zool. Journ. vi. p . 2Q8.
In h ab its the coasts o f the Arctic seas. I n the specimen represented the points of the reniform valves are
much eroded ; th a t o f the Zoological Society d isplayed them covered with minute granules. This is probably
the same as Ch. Emersoni o f Conthony in Boston Jo u rn a l of Na tura l History, vol. I I .
t. 4 1 ./ . 15. Wood’s General Conchology C h i t o n t u n i c a t u s , and Index Testaceologicus.
In the specimen figured by Wood the exposed p a rt of the valves is nearly white, having been eroded so
as completely to have lost all their na tu ra l surfa c e ; in the present individual they are only eroded a t the very
points, so th a t they exhibit the natural cha ia c te r o f the exposed p a rt o f the valves, which are nearly smooth,
of a da rk grey colour, with da rke r concentric lines.
C h i t o n a r t i c u l a t u s , t. 41. / . 16. Soioerby, Zool. Proc. March, 1832. p . 59.—
Conch. Illu str, Chiton, f . 18.
In h ab its un d e r stones a t St. Bias in th e Bay of C alifornia.
C h i t o n s e t o s u s , t. 4 1 ./. 17. Sowerby, Zool. Proc. 1832. p . 27.— Conch. Illustr.
C h ito n ./. 19.
In h ab its Guacomayo on the coast of C entral America.
C h i t o n r u g u l a t u s , i. 4 1 ./ . 18. Sowerhy, Zool. Proc. 1832, p . 58.— Conch. I l lustr.
C h i t o n , / . ^ .
F ound a t Pue rto Portrero, a n d on In n e r Lobos Island, in Central America.
P e c t e n p u l c h e r r i m u s , t. 4 1 ./. 1, 2.
Shell nearly equivalve, unequal-eared, very flat, white, one valve with a pin k apex, mottled with rose
colour, and having nine radiating ribs, one o f which a t each end is strongly spinose, the seven intermediate
ones being broader and covered with transversely fringed elevated scales ; the other valve having ten radiating
ribs, one of w hich a t each end is spinose, the eight intermediate ones being broade r an d covered with transverse
elevated, slightly inte rrupted scales ; interstices o f the ribs deep in both v a lv e s ; dorsal lines spinose in both
v a lv e s ; ears radiately grooved.
This is a small, b u t extremely beautiful and d elicate species
C h a m a e c h i n a t a , t. 4 3 . / . 9. Broderip, Trans. Zool. Soc. v o l I. p . 306. t. 3 9 ./-
5, 6, 7.
When young this shell is covered with numerous small pointed scales. The specimen here represented
s a very o ld one, the outside o f whose up p e r valve has been very much disfigured by Lithodomi.
Bu/c.XJI.
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