224 CHITONID.E. 



A specimen was described by Captain Brown as having 

 only five plates, nnder 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 (bnt 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. richer, Lowe, in Zool. Journ. ii. p. 101, pi. v. f. 2 ; F. & H. ii. p. 309, 

 pi. lix. f. G, and (animal) pi. A A. f. 6. 



Body oval, inclining to oblong, yellow or creanicolour, 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. marginatum ; 

 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 surmounted 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 line : 

 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: beaks 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 : 



* Ked. 



