History of British animals - University of Guam Marine Laboratory

Chiton. MOLLUSCA. BRANCHIFERA. 289crinitus of Pennant, Brit. Zool. iv. 71- t. xxxvi. f. 1., which he describes" with seven valves ; thick set with short hairs ; |ths of an inch long," asinhabiting the sea near Aberdeen, is no other than this species. In the figuremay be traced the tufts and the central striated ridge characters unnoticed;in the description,— and, itmay be added, that the figure given by Maton andKackett of the Chiton fascicularis, Linn. Trans, viii. t. i. f. 1., bears no remoteresemblance to the one by Pennant, now referred to.* Marginal band rough.159. C. marginatus.— Shell with a central ridge, regularlyshagreened.Perm. Brit. Zool. iv. 71- t. xxxvi. f. 2. Mont. Test. Brit. i. Maton andBackett, Linn. Trans, viii. 21. t. i. f. 2. Flem. Edin. Encyc. vi. 102.C. cinereus, Lowe, Zool. Journ. vol. ii. p. 99 On stones about lowwater-mark, common.Length about fths of an inch, breadth |ths. Colour greyish or reddish,sometimes freckled. Anteal and retral valves with about ten notches on themargin of each, on the lower edge;the intervening valves with only one notchon each side, the termination of a flexure in the shell, which extends obliquelyto the back of the ridge, and divides each side of the valve into twotriangular compartments, the retroJateral ones being always more elevated.In the last valve the lines of growth are elliptical and entire. The marginof the shell, around, is a little depressed. Body rough, dusky brown, sometimesfreckled with white, with a spinous margin.Branchiae about twentyon each side—I possess a variety of this shell, which I found under a stoneat Newhaven in 1811, with only six valves. Is the Chiton Asselloides of MrLowe, Zool. Journ. vol. ii. 100. t. v. f. 5., any thing else than an indistinctlymarked variety of the present species. The fringe being short and indistinct,might lead to the suspicion that it was the same as C. marmoreus of Fabricius,though that species is probably not distinct from C. marginatus.160. C. rube?'.— Smooth, glossy, marked by distinct lines ofgrowth.Patella articulata cymbiformis, Wallace, Ork. 41 C. ruber. Linn. Svst.Nat. i. 1107.—C. laevis, Penn. Brit. Zool. iv. 72—C. ruber. Flem.Edin. Encyc. viii. 102. Lowe, Zool. Journ. ii. 101. t. v. f. 2 Onstones at low water-mark, common.Length about half an inch, breadth a quarter. Colour reddish, mottledor striped with brown and white. This is more sharply arched than the preceding,producing a higher dorsal ridge valves with blunt ; beaks, perfectlysmooth, except by the lines of growth, with marginal notches nearly like thelast ; border broad, striped brown and white, with a nearly entire margin.—This species isvery common in Orkney and Zetland : we have found it likewisein abundance on the shores of Loch Broom, whence Pennant's specimenswere obtained—Mr Lowe has found it on the Yorkshire coast.161. C, cinereus. — Valves short, depressed, moniliformlystriated.Linn. Syst. Nat. i.1107. Mont. Test. Brit. 3. Flem. Edin. Encyc. vii.102—C. Assellus, Lowe, Zool. Journ. ii. 101. t. v. f. 3.— On stonesand old shells at low water, not uncommon.Length about half an inch, breadth about a quarter. Colour greyish, withdusky stripes; valves little raised in the middle, and but slight beaked ;markings of growth indistinct ; striae longitudinal on the anteal, and diagonalon the retral compartment; under margin of the valves granulated, notnotched. Border narrow, with an indistinct fringe.VOL. T.T