( ii i i-.ri.i i i: \. 



.' l,t'i>i<1i>l>'iirn.< l,inii <Yi:., Ma/. <'atal. p. l'.7. - t '/m In/,/. 

 bnmii ( Yi;. MS. 



Diilcrs from L. Macandrei in l.<-in- longer, with lip 

 mucronated and rounded at tin- extremities, the posterior heini: hol- 

 lowed out and the rot much elevated, without conspicuous middle 

 portion or lateral areas. The only perfect specimen found 

 Acma-a fax-icularis) displays no trace of solid scales. Tin- account 

 of the interior is taken from :i lame central and -mall anterior 

 valve supposed to belong to this species from their agreement in 

 other respects. 



C. FLAVE8CEN8 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 jugum indistinct ; mucro 

 small, superior. Entire surface furnished with close granule-, 

 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 2|, 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 to the jugum. (Q/r.) 



C. LITRIDA 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. (/%.) 



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



Chiton Inridus Sown., P. Z. S. 1832, p. 26 ; Conch. Illustr. f. 20. 

 REEVE, Conch. Icon. f. 85. Chiton srubrtcidus SOWB., P. 7.. S. 

 1832, p. 28 ; Conch. Illustr. f. 21 . RKKVI:, t, 15, f. Sl.IschnocJiiton 

 parallelus CPR., Ann. and Mag. N. Hist. (3), xiii, p. 314. Isch no- 

 chiton (f var.) prasinatm CPR., /. c., p. 314. 

 3 



