14 LEPIDOPLEURUS. 



SOWERBY ; REEVE ; LOVEN ; JEFFREYS, Brit. Conch, vol. iii, p. 

 218, v, p. 198, t. 56, f. 2 ; P. Z. S. 1882, p. 668., non LINNE, teste 

 HANLEY, Ips. Lin. Conch, p. 17. Leptochiton cinereus GRAY, P. 

 Z. S. 1847, p. 127, 168 (var. white, C. " albus " exclus.) as type of 

 genus. Leptochiton asellus H. & A. ADAMS, Gen. i, p. 473. GRAY, 

 Guide, p. 182. CPR. ms., p. 2. BALL, Proc. U. S. Nat. Mus. 1878, 

 p. 318. f Lepidopleurus cinereus L., SARS., Moll. Reg. Arct. Norv. 

 p. 112, t. 7, f. 8. Chiton islandicus GMEL., Syst. p. 3206. C.fus- 

 catus LEACH, not Brown. C. scoticus LEACH, teste Jeffr. C. onyx 

 SPENGLER, Skrivter af Naturhistorie-Selskabet (Udforlig Be Skri- 

 velse over det mangeskallede Conchylie Slaegt af Linne kaldet 

 Chiton med endeel nye Arter og Varietat) Oplaest, 28 Febr., 1794. 

 iv, 1 Heft. p. 62, 1797 cf. Mai. Bl. xvii, p. 113. 



This species is allied to L. granoliratus Cpr., but that is more 

 elevated, the central and lateral areas are more diverse in sculpture, 

 and the concentric wrinkles are much stronger. In L. cancellatus 

 the lateral areas are raised, which is not the case with the asellus. 



" Under the microscope this species can easily be separated from 

 T. cinereus Lii.(=marginatus Jeffr.) by external characters. In the 

 Tracliydermon the scales are very minute, smooth, granular, reddish 

 and closely appressed to the girdle ; in the Leptochiton they are 

 gravel-like, irregularly crowded, larger, lengthened and striated. In 

 T. marginatus, also, the valves are more beaked, especially in young 

 shells." (Cpr.) 



L. GRANOLIRATUS Carpenter, n. sp. PI. 2, figs. 47-53. 



Shell oval, rather low and regularly convex, not angulated dor- 

 sally. Very finely and closely granose-lirate, the anterior and pos- 

 terior valves, and the lateral areas of the median valves strongly 

 corrugated concentrically. Color " ashen- orange" or fleshy-ashen, 

 with an ill-defined darker dorsal stripe. 



The anterior valve, and the lateral areas of the intermediate valves 

 are finely radially granose, and have a number of strong concentric 

 wrinkles. The central areas have close fine subgranose longitud- 

 inal lira?. The lateral areas are slightly raised. 



Umbo of the posterior valve somewhat in front of the middle, 

 rather prominent ; posterior slope concave, radiately granose-lirate 

 and strongly, irregularly, concentrically wrinkled. 



