CH.ETOPLEURA. 33 



f Lepidopleurus beanii CPU., Maz. Catal. p. 197. Chcetopleura 

 beanii CPR. MS. 



Differs from L. Macandrei in being longer, with the valves 

 mucronated and rounded at the extremities, the posterior being hol- 

 lowed out and the rest much elevated, without conspicuous middle 

 portion or lateral areas. The only perfect specimen found (on 

 Acmsea fascicularis) displays no trace of solid scales. The account 

 of the interior is taken from a large central and small anterior 

 valve supposed to belong to this species from their agreement in 

 other respects. 



C. FLAVESCENS Carpenter. Unfigured. 



Shell ovate, much depressed, yellow, spotted with orange. Valves 

 wide, somewhat rounded at the margins, the interstices curved, 

 strongly mucronate. Lateral areas and jugurn indistinct ; mucro 

 small, superior. Entire surface furnished with close granules, 

 scarcely punctulate; girdle thick, nearly smooth, furnished at the 

 margin with delicate erect flattened spines. Sutural plates large, 

 arcuate ; sinus large. End valves with about 10, intermediate 

 valves 1 slit. Length 4, breadth 2f, alt. f mill.; divergence 150. 



Mazatlan, on shells. 



Chiton flavescens CARPENTER, Maz. Cat. p. 198. 



This is the least uncommon of the small Chitons, six specimens 

 having been found of it. It is distinguished by its yellow color, 

 great depression and small strong mantle margin, without covering, 

 except at the margin where a fine row of transparent flattened hairs 

 may be seen. The smaller lobe on the margins of the inner valves 

 is bounded by two rows of holes which proceed tothejugum. (Cpr.) 



C. LIIRIDA Sowerby. PI. 12, figs. 53, 54. 



Shell oblong, rather elevated, ashen ; front valve, lateral areas of 

 intermediate valves and posterior valve coarsely granulose ; central 

 areas longitudinally sulcate, threads between the grooves granulose. 

 Length 30, breadth 15 mill. (Sby.) 



Sta. Elena, W. Colombia, on stones in 5 fms. 



Chiton luridus SOWB., P. Z. S. 1832, p. 26 ; Conch. Illustr. f. 20. 

 REEVE, Conch. Icon. f. 85. Chiton scabriculus Sows., P. Z. S. 

 1832, p. 28 ; Conch. Illustr. f. 21 . REEVE, 1. 15, f. Sl.Ischnochiton 

 parallelus CPR., Ann. and Mag. N. Hist. (3), xiii, p. 314. Ischno- 

 chiton (? var.~) prasinatus CPR., /. c., p. 314. 

 o 



