216 CHITONID^. 



sides ; there is no distinct ridge : colour dirty brown or ashy : 

 beaks small and moderately pointed : inside porcellanous ; the 

 margin has no notches, but is indistinctly and microscopically 

 crenulated. L. 0-4. B. 0-2. 



HABITAT : Stones and old shells, from 20 to 80 f., in 

 the following localities : Plymouth, in trawl refuse, with 

 Odostomia truncatula and other south of England shells 

 (Jordan) ; Scarborough (Bean) ; Cullercoats (Alder) ; 

 Co. Galway (Barlee) ; Co. Antrim (J. G. J.) ; Oban'and 

 Hebrides (Barlee, M f Andrew, and J. G. J.) ; Moray 

 Firth (Gordon) ; Shetland (Barlee and J. G. J.) : it is 

 not common. Coralline Crag, Sutton (S. Wood). It 

 inhabits every part of the Scandinavian coast, from the 

 south of Sweden to Finmark, at depths varying from 

 35 to 120 f. ; Malm noticed it on Lophelia (Oculina) 

 prolifera. I dredged in the Gulf of Spezzia a young 

 shell which I considered to be the present species ; and 

 M. Petit states that Mr. Shuttleworth found two speci- 

 mens on a Cardium peculiar to the Caribbean Sea, which 

 he received among some West-Indian shells. These 

 southern localities, however, want confirmation. 



The lingual membrane is armed with numerous teeth 

 arranged in rows, two of which are more prominent than 

 the rest and are furnished with black hooks. Specimens 

 from the North Sea attain a considerable size. I have 

 one from Shetland fully three-quarters of an inch long, 

 and a plate which must have belonged to a specimen 

 twice that size. 



It is the C. strigillatus of S. Wood. The C. Nagelfar 

 of Loven is C. Hanleyi of an extraordinary large size ; 

 and so is the C. abyssorum of Sars. 



