42 Mighels^ and Adams^ Descriptions of 



Remarks. This is unquestionably a very rare species. It 

 does not appear to be very nearly allied to any of the other 

 species found on our coast. Further research will be neces- 

 sary to determine whether or not the specimens already found 

 are mature. Like most of the Pectens, this shell varies very 

 much in coloring. 



CHITON MENDICARIUS. 



Plate IV. Fig. 8. 



C. testa elongatd, in medio longitudinaliter ad latus irregulariter granulatd, 

 cinere^, nubeculat^ j areis-parum conspicuis ; margine coriaceo, rabro. 



Shell cinereous, with dark clouds, long-oval with obtuse 

 dorsal ridges, surface with elevated dots or granules disposed 

 in longitudinal lines, except towards the margin, where they 

 are irregular and larger ; no visible concentric striae ; triangu- 

 lar areas very indistinct, outer ones small ; margin coriaceous, 

 red. 



Length, 1 inch ; breadth, ,4 inch ; width of margin, ,06 

 inch. 



Habitat. Casco Bay. This very distinct species was 

 taken from the stomach of a haddock in June, 184L Only a 

 single specimen has been found, which is in the cabinet of 

 J. W. Mighels. 



CEMORIA PRINCEPSo 

 Plate IV. Fig. 9. 



C. testi alba, procerA, costnlalci, punctulatd; rirnaintHs in canalenr] proJucta, 

 fornice obtectus ; fornice lateraliter testae alls adjuncto ; apertura ovata, cren- 

 ulata. 



Shell clear white, elevated, conical, with twenty five to 

 thirty slight, obtuse ribs, and intervening small ones, the 

 dividing striae minutely punctured : summit decumbent, with 

 a single minute whorl ; apex visible on the right side ; an- 

 terior slope rectilinear, posterior slope sub-rectilinear ,• from 

 the rima within, a narrow groove with callous sides proceeds 

 anteriorly, covered in part by a flattened arch, which arises 



