38 DR Johnston's descriptive catalogue of the 



Hab. On old shells from deep water, rare. 



The shell is often prettily variegated and streaked with brown, green, and 

 white. There arc 18 tufts around the sides, the hairs short, rigid, as- 

 bestine, and often spread out stellate-wise. The edge of the band 

 is also fringed with cilia. Mouth with a puckered rim and a nar- 

 row veil. The Chiton fascicularis of Linnseus is surely distinct from 

 our European species. 



2. C. niarginatuSy shell oval, variously coloured and spotted, com- 

 monly cinereous ; valves finely shagreened, the medial line ob- 

 tuse ; marginal band spotted, pulverulent, ciliated on the edge ; 

 interior greenish. Length ^^^ths. Flcm. ferit. Anim. 289. Ch. 

 cinereus, Lowe, in Zool. Journ. ii. 99. 



Hah. Under stones between tide-marks, very common. 

 The marginal cilia are very short, and scarcely appear in cabinet specimens 

 unless these have been carefully dried. 



3. C. ruber, shell oval, reddish, mottled ; valves obtusely carinate, 

 smooth, glogsy, marked with striae of growth; border pulverulent, 

 spotted with red and white. Length t"^ ths. Flem. Brit. Anim. 

 289. Lowe, in Zool. Journ. ii. lOL tab. 5. fig. 2. 



Hab. At low water-mark, rare. 



4. C. cinereus, shell oval, blackish or ash-grey ; valves scarcely 

 beaked, rough with small granules closely arranged in lines ; 

 border granular. Length -j*oths. Flem. Brit. Anim. 289. Ch. 

 asellus, Lowe, in Zool. Journ. ii. 101. tab. 5. fig. 3. 



Hah. On shells and stones from deep water, frequent. 



The granules of the border are sometimes rubbed off; they correspond in 

 colour with the general colour of the shell. The ciliated fringe of the 

 marginal band is very short. 



The Chiton ascllus of Captain Brown (Illustr. pi. 35, fig. 14.) is undoubt- 

 edly distinct from our Ch. cinereus ; and Brown's Ch,f meatus (pi. 35, 

 fig. 17.) is probably identical with it. 



Order— CmilHOBRANCHIATA. 

 Dentalium. LinruBUS. 



Shell simply tubular, slightly arched, tapered posteriorly, and open 

 at both ends. 



1. 2>. cntalis, shell white, strong, smooth, and even. Length, 1/gths. 



Diam. of the mouth /gths. Dillw. Rec. Sh. 1065. 



Hab. Deep water, frequent. 



The posterior aperture of the shell forms a perpendicular slit, emarginate 



on the dorsal side, and furnished with two small testaceous convex 



plates. 

 The form of the animal is, like that of the shell, round, and tapering gra- 



