198 TONICIA. 



of these differences however, do not avail to name specimens in 

 which various characters of elegans are combined with other char- 

 acters of chilensis ; so that while when typically developed the forms 

 may readily be separated, it is, I believe, impossible to classify 

 occasional synthetic specimens. I have therefore considered chilensis 

 a phase or variety of elegans. 



Subspecies LINEOLATA Frembly. PI. 41, figs. 25, 26, 27. 



Shell oblong, moderately raised, the ridge rather rounded. Sur- 

 face smooth ish. Ground color light fawn or fleshy, each valve 

 closely and finely lineolate with chestnut, the lines concentric to the 

 umbones; fifth valve marked with brown at the ridge, and often 

 some of the other valves are marked with dark brown or are entirely 

 of that color. 



Lateral areas closely, finely granulated, and having two or three 

 rows of eyes extending down near the low, smooth diagonal. Central 

 areas smooth except for a group of engraved grooves on each side of 

 the smooth narrow dorsal band. Second valve either smooth or hav- 

 ing a median carina. End valves granulate toward the periphery, 

 closely dotted with eyes in irregularly radiating rows. Umbo of 

 tail valve anterior, the space in front of it smooth. 



Inside white, each valve marked with reddish under the beaks. 

 Sinus delicately denticulate. Anterior valve having 8-9, central 1, 

 posterior valve 9-10 slits; teeth blunt, pectinated. 



Girdle leathery, nude, yellowish-brown. 



Length 25, breadth 15 mill.; divergence 110. 



Length 40, breadth 23 mill. 



Valparaiso, Chili. 



Chiton lineolatus FREMBLY, Zool. Journ. iii, p. 204, suppl., pi. 17, 

 f. 7 (Good). SOWERBY, Conch. Illustr. (as syn. of elegans), f. 154. 

 REEVE, Conch. Icon., t. 7, f. 34. Tonicia lineolatus CPR. 

 ? Chiton bruguieri Pot. & Mich. Galerie, i, p. 534 (1838.) 



The distinguishing characters of typical lineolatus are the lack of 

 larger tubercles along the diagonal ridge, and the fine concentric 

 line-painting. The characters of both sculpture and color-pattern 

 however, are in some specimens inextricably united with these of T. 

 elegans, of which species I am therefore compelled to consider this a 

 variety. 



Many specimens show several valves of uniform black-brown ; 

 others are blotched on many valves with the same. The species 



