224 CHITONID.E. 



A specimen was described by Captain Brown as having 

 only five plates_, under the name of C. quinquevalvis. 

 Other synonyms of the ordinary form appear to be 

 C. cimex, Chemnitz^ C. cimicinus, Landt, C cinereus, 

 Laskey and Lowe (but not of Linne) , C fuscatus, Brown 

 and Macgillivray^ C. variegatus, Leach (but not of Phi - 

 lippi), and Lepidopleurus carinatus of the same author. 

 It may be partly the C. punctatus of Linne. 



8. C. RUBER^ (Linne), Lowe. 



C. ruber, Lowe, in Zool, Journ. ii. p. 101, pi. v. f. 2; F. & II, ii. p. 399, 

 pi. lix. f. G, and (animal) pi. A A. f. G. 



Body oval, inchning to oblong, yellow or creamcolour, and ap- 

 parently of a granular texture: mantle thin : girdle rather broad, 

 of a mealy aspect, covered with numerous minute spherical 

 granules which lie evenly on the surface, as in C. marginatiis ; 

 it is chequered with alternate patches of red and white; margin 

 thickly fringed with very short spines of the same colour as 

 the patch to which they belong : head semioval, edged with a 

 narrow band of brown, which is snrmoimted by a line of 

 darker hue : mouth when closed forming an arched slit, also 

 surrounded by a darker line, and concentrically wrinkled: 

 gills more exposed than in C. cinereus : foot elliptical, bordered 

 by a light-brown band, which is much narrower than the one 

 round the head, and likewise surmounted by a dark hne: 

 vent or excretal duct broad and wedge-shaped. 



Shell convex : plates broad, solid, opaque, and glossy ; 

 lateral compartments indistinct : sculpture, parallel lines of 

 growth, which are sometimes remarkably strong and con- 

 spicuous ; with a lens of moderate power it appears otherwise 

 to be quite smooth ; but if a Coddington or Stanhope be used, 

 the whole surface is found to be very finely and closely reticu- 

 lated: ridge more or less prominent, but seldom distinct: 

 colour reddish-brown of different shades, mottled or streaked 

 with white or pale yellow : healcs strong and projecting : inside 

 rosecolour in the middle of each plate, with a greenish hue 

 on the edges and sides, shouldered as in the foregoing species : 



* Eed. 



