368 Mr. Broderip and Mr. G. B. Sowerby on some 



Shell marbled with whitish, greyish purple and chesnut. In general 

 form it resembles Cardium medium : the longitudinal strise are worn 

 down on the upper parts of the shell. 



Cardium Boreale. 



C, iestd ohovatd, postice subangulatd, costis radlantihus numerosis, 

 rotundatis; epidermide fused ; long. lj%^ lat. -^-^f alt. l^\,poll. 

 Hah. in Oceano Arctico. 



Shell white, with a dirty brown epidermis and numerous close-set 

 rounded ribs : the two ends nearly equal in length, the posterior being 

 slightly angulated. From Icy Cape. 



Chiton albolineatus. 



Ch. valvis IcBvihus, atro-fuscis, areis lateralibus elevatiusculis, radia- 

 tim alho-lineatisi margine granulato ; long. \^\i lat. \^, poll. 

 Hah. ad littora Mexicana. 



The valves are of a dark colour, sometimes wholly so, but mostly with 

 two or three white dotted lines passing from the central points towards 

 the edges : the two terminal valves have numerous white lines diverging 

 from their centers. From Mazatlan. 



Chiton Loo-CHooANus. 



Ch. valvis suhseahrosis, areis marginalihus radiatim granosis, margine 

 coriaceo superne granoso, granis elevatis ; long. \^, lat. -^^^,poll. 

 Hah. in mari Sinensi, ad littora Insulse Loo-Choo. 



A very pretty little Chiton, whose margin is covered with small grains, 

 resembUng very short, blunt spines. 



Chiton vestitus. 



Ch. valvis reniformihus, membrand coriaced vestitis, apicihus nudis ; 

 long. Iy6_, lat. y^, poll. 



Hah. in Oceano Arctico. 



The rather elevated points of the valves are alone visible in the living 

 animal : but when the coriaceous membrane which covers them is dry, 

 their edges are easily traced. Little bunches of brownish hairs are scat- 

 tered over the surface. This cannot be the Ch. amiculatus of Pallas, 



