34 Dr. J. G. Jeffreys on a new Species of Chiton. 



wider and closer together on each side than in the middle ; 

 between the foot and the mantle are red patches corresponding 

 with the plates of the shell, and united by a continuous but 

 irregular red line that encircles the body within the mantle : 

 gills unequal in length : girdle of moderate width, covered 

 with small regular and close-set yellow roundish-oval granules; 

 margin fringed with numerous short spines. 



Shell oval-oblong, somewhat depressed, of a dull hue : 

 plates narrow ; all except the terminal ones are nearly equal 

 in width ; the lateral compartments in each valve are indis- 

 tinct, and not raised above the middle portion : sculpture con- 

 sisting of minute tubercles, arranged in several longitudinal 

 rows, which are distinctly defined in the middle, and radiate 

 or diverge to the margin on the lateral and terminal spaces ; 

 there is no central ridge : colour yellowish brown : beaks in- 

 conspicuous, except on the tail-plate : inside glossy, furnished 

 towards each side of all the plates, except the head-plate, with 

 obtusely triangular leaves, which serve to interconnect the 

 plates ; margin slightly and irregularly notched. L. 02125. 

 B. 0-125. 



Hob. Goodrington, Torbay (Mr. Pidgeon) ; Jersey (Mr. 

 Duprey). It appears to be rare. I received this species first 

 from Mr. Pidgeon, and considered it a variety of C. cancellatus • 

 but subsequent communications from Mr. Duprey have in- 

 duced me to alter my former opinion. For the description of 

 the animal I am indebted to Mr. Duprey. The shell is not con- 

 vex or gibbous like that of C. cancellatus, and it is somewhat 

 broader in proportion to the length ; the rows of tubercles are 

 half the number, and the tubercles are more raised and much 

 coarser, giving a rough or scabrous aspect to the shell ; the 

 granules which cover the girdle are more regular in shape and 

 arrangement ; and there are some differences in the animal, 

 which are shown by comparing the description of the present 

 species with that of C. cancellatus, in the fifth volume of 

 ' British Conchology/ p. 198. Mr. Duprey tells me that he 

 finds C. scabridus with C. cancellatus , as well as Rissoa 

 lactea and R. striatula, in the lower part of the littoral zone, 

 living underneath stones. This is a remarkable habitat, and 

 is shared also by Adeorbis subcarinatus. 



I cannot adopt the artificial system proposed by the late 

 Dr. Gray, Dr. Philip Carpenter, and Messrs. Adams in gene- 

 rically separating our species of Chiton. In ' The Genera of 

 Recent Mollusca ' Chiton marmoreus, Fabricius (under the 

 name of C. Iwvigatus, Fleming), is placed with C. cancellatus 

 in the genus Leptochiton of Gray, because the " mantle- 

 margin " (girdle) is said to be " covered with minute, gra- 



