CHITON. 183 



The prominent features of this little species are its ruddy color, 

 great elevation, like a gothic roof, and the sculpture. 



This species is not identical with the Lepidopleurus corallinus of 

 Risso, as Monterosato has said. It is impossible for me to believe 

 that Risso would have used the words " avec les elevations laterales 

 bisulquees" if he had been describing C. rubicundus. The identi- 

 fication of the learned authority on Mediterranean shells was not 

 founded upon an examination of Risso's type. 



C, HAMYI Rochebrune. PI. 35, figs. 85, 86. 



Shell ovate-elongate, carinated, green, painted longitudinally und 

 regularly with alternating lines of ivhite, blue and buff. Head valve 

 lateral areas and posterior areas of the tail valve sculptured with strong 

 concentric ridges, which are irregular and as if imbricated ; central 

 areas having 7 strong, wide, obliquely curved ribs, the middle smooth. 

 Girdle scaly, scales rounded, very shining. 



Length 23, width 12 mill. (Eochebr.~) 



Strait of St. Lucie, Cape Verde Is. 



Gymnoplax hamyi ROCHEBR., Bull. Soc. Philom., Oct., 1881 ; 

 Nouv. Arch, du Mus. (2) iv, p. 242, t. 17, f. 13o, c (1881.) 



Allied to C. concentricus Reeve, but distinguished by the imbrica- 

 tion and irregularity of the concentric strise of the end valves and 

 lateral areas, by the width and small number of grooves on the sides 

 of the central areas, and the absence of a mucro on the tail valve. 

 (Rochebr.) 



The references to the figures of this species and C. insularis are 

 transposed in Rochebrune's publication. 



C. INSULARIS Rochebrune. PI. 35, figs. 83, 84. 



Shell ovate, elongate, subcarinated, the carina obtuse ; olivaceous, 

 sparsely spotted with white; anterior valve and posterior part of the 

 tail valve sculptured with radiating, interrupted, feebly granose ribs; 

 median valves having the central areas smooth in the middle, sulcated 

 at the sides, the sulci unequal, lanceolate, pointed at the ends, con- 

 centrically arranged ; lateral areas having branching radiating ribs. 

 Girdle olive marked with white spots, scaly, the scales minute. 

 (Eochebr.') Length 27, breadth 15 mill. 



Strait of St. Vincent, Cape Verde Is. 



Gymnoplax insularis ROCHEBR., Nouv. Archiv du Mus. (2) iv, p- 

 243, t. 17, f. 12a, b. (1881.) 



Compare Ch. olivaceus Spengl. 



