CH^TOPLEURA. 71 



margin ; posterior valves semi-lunar ; lateral areas large, extending 

 quite to the anterior edge of the valves, ornamented with irregularly 

 scattered, cyliudrical eminences, which are easily detached, leaving 

 a scar ; the central areas have thick-set, longitudinal ranges of similar 

 eminences. Margin coriaceous, covered with short and scattered 

 setse. {GUI.) 



Length one inch ; breadth two-fifths of an inch. 



Ilha do Pai, at the entrance of Bio Janeiro Harbor (U. S. Expl. 

 Exped.) 



Chiton asperrimus Couth. MS., Gould, U. S. Exploring Exped. 

 Moll., p. 326, f. 418 a-b. 



This is evidently a Chcetopleura of the C. apiculata group. Gould's 

 figures do not show the girdle satisfactorily. Gould compares the 

 granules to little cylindrical pedestals. 



C. TEHUELCHA Orbigny. Vol. xiv, p. 205. 



This seems to be a Chaiopleura, allied to C.fulva, rather than a 

 Tonicia. I have not seen specimens. 



C. FULVA Wood. Vol. xiv, PI. 44, figs. 62, 63, 64. 



Shell oval or oblong, elevated, acutely carinated, solid. Color 

 pale buff suffused with rich orange-red toward the apices of the 

 valves, or dull reddish all over, with white threads on the central 

 areas. 



Valves strong, somewhat beaked ; central areas sculptured with 

 white longitudinal beaded threads, separated by flat dark spaces; 

 the threads are irregular at the jugum, often divaricating or anasto- 

 mosing. Lateral areas slightly raised, having several subobsolete 

 radii; end valves obsoletely radiated. 



Interior white, having faint brown streaks diverging from the 

 apices. Sutural plates rounded ; sinus angular, not toothed. Ante- 

 rior valve having 9-11, central!, posterior 9-11 slits; teeth con- 

 spicuously, coarsely, pectinated outside, crenulated at their tips, and 

 rather obtuse. Eaves short, solid, narrowly grooved along the teeth. 



Girdle leathery, light brown, bearing small, scattered and whitish 

 hairs. Length 33, breadth 19 mill. 



Portugal. 



Chiton fulvus Wood, General Conchology, p. 7, t. 1, f 2. — Sow- 

 ERBY, Conch. Illustr., f. 53, 83. — Reeve, Conch. Icon., f. 39. — 

 Chostopleura fulva Rochpjbrune, Miss. Sci. Cap Horn, p. 137. — 

 Thiele, Das Gebiss d. Schn. ii, p. 381, t. 31, f. 16 (dentition).— 



