30 CHJETOPLEURA. 



valve 13 slits, (Carpenter gives : ant. v. 10, centr. 1, post. 9-12 

 slits). Teeth sharp, those of the head valve prominently grooved 

 outside. Eaves narrow and short, grooved just above the teeth, not 

 spongy. 



Girdle (pi. 17, fig. 39) granulated, sparsely clothed with stiff 

 white spinelets. 



Gills continuous to the head, as in C. peruviana. 



Length 43, breadth 28 mill. 



Callao Peru, on Pectens, in 5-7 fms- 



Ch. hennahi GRAY Spicil. Zool. p. 6, July, 1828. Sows., Conch. 

 Illustr. f. 1, 33. REEVE, Conch. Icon. t. 7, f. 37, and pi. 23, lower 

 central figure. 



This species is closely allied to C. peruviana in form of the 

 valves and sculpture. The girdle hairs are short, deciduous, and 

 when retained they are disposed to lie in bunches. The front 

 teeth are decidedly grooved outside, in old specimens resembling 

 those of Tonicia fulva. 



C. NOBILIS Reeve. PI. 14, fig. 80. 



Shell ovate, smooth or very closely marked throughout with 

 minute raised dots ; lateral areas faintly radiately grooved. Red- 

 dish chocolate-brown, unspotted ; ligament horny, beset with very 

 short, hard bristles (five.) 



Habitat unknown. 



Chiton nobilis " Gray," REEVE, Conch. Icon. t. 21, f. 139, May, 

 1847. Not Chiton nobilis Gray. Chcetopleura nobilis Rv., CPR. 

 MS. 



Carpenter further describes the type specimen : mucro median 

 little elevated ; valves rounded at the sides. Interior : post, valve 

 with 9, ant. 11, centr. 1 slit. Teeth acute; eaves small; sinus 

 small, deep, planate, smooth. Girdle leathery, pale brown, sparsely 

 and irregularly beset with very short, solid, black, somewhat scale- 

 like bristles. 



The above is written from the type specimen which Rve. described 

 as the C. nobilis of Gray, and which Mr. Adams most kindly sub- 

 mitted to my examination. This shell proves to be a normal Chseto- 

 pleura : while Eudoxochiton nobilis Gray, belongs to the Lophy- 

 roid section. Lest the confusion should be repeated, the following 

 notes on the sculpture of C. nobilis Rve. may be useful. 



