1S4 malacozoa. gasteropoda, cycloukanchiata, 



2. Chiton 7iiarginutus. Bordered Canoe-Shell. 



Shell elliptical, moderately convex, subcarinate, of ei^ht 

 minutely dotted (shagreened) valves, of a greyish or reddish 

 colour, or variegated ; the anterior and posterior valves senii- 

 circular, quincuncially granulated, the rest nearly even, the 

 areas being but faintly defined, and having the gramdes dis- 

 posed in curved lines ; the marginal band also granulated, 

 coloured with alternate dusky and whitish spots, and edged 

 ■with minute spinelets. Length about three-fourths of an inch 

 or more, breadth nearly half an inch. 



It varies greatly in colour, being sometimes plain, grey, 

 greenish-grey, or brownish, or reddish, more frequently va- 

 riegated with numerous spots. Often the beaks are very 

 distinct, and the posterior margins of the valves somewhat 

 tuberculate, the prominences usually whitish. 



Not imconnnon on the rocky coasts, at Peterhead, Port- 

 soy, CoUieston, and in the Bay of Nigg. 



Found by Mr. Leslie and by Mr. Alexander Murray on the 

 coast of Gamrie and Peterhead. Plentiful in pools on the 

 Gh-dleness, and about the Cove. 



Chiton margiuatus. Penn. Brit. ZooL iv. 71. PI. 36. f. 2, — Chi- 

 ton marginatiis. Mont. Test. Brit. i. — Chiton margiuatus. Fleiu. 

 Brit. Auim. 289. — Chiton margiuatus. Lamk. Svst. vi. 321. 

 Ed. 2. vii. 492. 



3. Chiton cinereus. Yellow-grey Chiton. 



Sh?ll elliptical, moderately convex, carinate, with the 

 sides sloping, and even ; and the valves eight, moniliformly 

 striated ; the anterior semicircular, emargiuate behhid, con- 

 centrically rugose, and radiatingly striulate ; the posterior si- 

 milar, its anterior half subcarinate ; the rest narrow, carinate, 

 slightly beaked, striulate, with the striae of the anterior area 

 longitudinal, those of the tAvo posterior area?, which are 

 elevated, radiatingly transverse ; the border narrow, minutely 

 reticulated, with the edge spinulose ; the colour yellowish- 

 grey, with the posterior oxeve of the valves variegated with 

 brown. Length four-twelfths, breadth two-and-a-half twelfths. 



An individual found on a star-lish, at Gamrie, in Septem- 

 ber, 1842j by Miss Macgillivray ; others by Mr. Murray. 



Cliiton cinereus. Linn. Syst. Nat. 1107. — Cliiton cinereus. Mout. 

 Test. Brit. 3. — Chiton cinereus. Flem. Biit. Anim. 289, 



