CHITON. 163 



chestnut rayed with brick-red, (or " copperas-green or reddish, more 

 or less flamed with jet-black.") 



The lateral areas are somewhat raised, and sculptured with 

 numerous (8 to 10) low radiating striae, which are finely, unevenly 

 interrupted by growth-lines. Central areas sculptured by some 

 growth-wrinkles, and by fine longitudinal threads, which are gener- 

 ally obsolete or absent except on the front of the dorsal ridge of each 

 valve. End valves having radii like the lateral areas, their uneven- 

 ness giving the valve a superficially pitted or finely netted appear- 

 ance. Beak of tail valve near the anterior margin. 



Interior pale bluish, the sutural-plates whiter. Anterior valve 

 having 15, central 1, posterior valve 20 slits; teeth rather sharp- 

 edged, strongly crenulated inside and out ; sinus-area spongy ; slits 

 and slit-rays coarsely spongy. Eaves short. 



Girdle densely covered with fine, smooth, convex, shining, black 

 or olive-black scales. 



Length 42, width 24 mill. ; divergence 110. 



Island of Chiloe (Cuming) ; Chili. 



Chiton subfuscus SOWERBY, P. Z. S. 1832, p. 26. Chiton striatus 

 Barnes, So WE., Conchol. Illustr., f. 3, 41 (excl. synon.). C. striatus 

 REEVE, Conch. Icon., t. 1, f. 36. Not Chiton striatus BARNES. 



This species is closely allied to C. magnificus, but differs in being 

 smaller, narrower and more elevated, in lacking blue dots, and in 

 the partial obsolescence of the longitudinal striation of the central 

 areas. Figure 19 represents the form which judging by his measure- 

 ments Sowerby considered typical. He afteward united olivaceus, 

 latus and striatus (all of vrhichmagnificus Dh.) with subfuscus. 

 Reeve adopted the name striatus, and figured the shell represented 

 by Sowerby's fig. 3 of the " Conchological Illustrations." This is 

 copied in our fig. 20. We are constrained by the terms of Sowerby's 

 original description to adopt the following arrangement. 



Typical subfuscus Sowb. PI. 38, fig. 19. 



Pale ashy olivaceous green, streaked and mottled with black ; 

 longitudinal sculpture all over the central areas, and radiating 

 sculpture on lateral areas, both strongly developed, the latter a little 

 interrupted into rugulations. 



The relations of this form with magnificus require investigation. 



