LEPIDOCHITONIDAE 3 1 3 



With tiny, granular scales: 



Interior of valves bright pink .... Ischnochiton ruber L. 

 Interior of valves white Ischnochiton albus L. 



Order CHITONIDA 

 Family LEPIDOCHITONIDAE 

 Genus Tonic ella Carpenter 1873 



Tonicella Tnannorea Fabricius Mottled Red Chiton 



Greenland to Massachusetts. Japan and the Aleutian Islands. 



About I inch in length, oblong to oval, elevated and rather acutely 

 angular. Colored a light-tan over which is a heavy suffusion of dark-red 

 maculations and specks. Upper surface appears smooth, although under 

 high magnification it is seen to be granulated. Lateral areas of intermediate 

 valves not very distinctly outlined. Interior of valves tinted with rose. Pos- 

 terior valve with 8 to 9 slits. Girdle is leathery and without scales or bristles. 

 Superficially this species resembles Ischnochiton ruber which, however, has 

 scales on its girdle. Common from i to 50 fathoms. 



Tonicella lineata Wood Lined Red Chiton 



Japan to the Aleutians to San Diego, California. 



About an inch in length, similar to T. marjuorea, but with its valves 

 smooth and shiny, and it is brightly painted with black-brown lines bordered 

 with white which run obliquely backwards on the intermediate valves. The 

 end valves have these same color lines concentrically arranged. Common 

 on the rocky shores of Alaska. The young live in waters off the shore 

 from 10 to 30 fathoms, but as they mature they migrate toward shore. 



Genus Lepidochitona Gray 1821 

 Subgenus Cyanoplax Pilsbry 1892 



Lepidochitona dentiens Gould Gould's Baby Chiton 



Alaska to Monterey County, California. 



% inch or slightly more in length, oval, slightly elevated. Color tawny, 

 olivaceous, slaty or brownish, usually covered with specklings of a darker 

 hue. Upper surface of valves covered with microscopic, sharp granulations 

 which are rarely aligned in any direction. Lateral areas may be slightly 

 raised, and may be bounded in front by a very low rib. The apex of the 

 posterior valve is near the center and is raised; behind the apex, the valve 



