254 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
by transmitted light, not ridged or grooved. Sculpture consisting of nu¬ 
merous rounded tubercles (transparent by transmitted light) irregularly 
scattered over the lateral areas, but over the central areas slightly smaller 
and disposed in 14-16 ill-defined, slightly oblique, longitudinal series, most 
crowded and irregular near the jugum. Head valve sculptured like the 
lateral areas. Tail valve with mucro somewhat in front of the middle, 
elevated. Girdle of moderate width, beset dorsally with numerous, faintly 
striate, glassy spicules of three main types: (1) very small, ovoid, pointed 
spinelets, forming a rather loose covering over the entire girdle, these being 
plainly striate near their apices; (2) elongate, dagger-like, marginal spine- 
lets; and (3) a few scattered, needle-like spines, often over twice the 
length of the marginal spicules, some of these distributed here and there 
over the general surface of the girdle, but the greater proportion occur¬ 
ring in loose groups of 5-8 at each suture, where they extend well up 
between the valves; though distinct, these groups scarcely tuft-like, and 
unaccompanied, so far as noted, by evidence of sutural or inter-sutural 
pores. Ctenidia about 8 on each side. Color everywhere a pale brown or 
brownish-white, deepening in tone at the beaks, but without other mark¬ 
ings. Long., 4.5 ; diam., 2.0 mm. (Berry.) 
Type in Berry Collection, No. 4102. Type locality, ledge off Point 
Pinos, Monterey Bay, California. 
Range. Monterey, California. 
Described as Hanlcya spicata Berry. 
Family LEPIDOCHITONIDAE 
Genus LEPIDOCHITONA Gray, 1821 
Mantle-margin covered with minute, granule-like, round, smooth scales, 
not imbricate. 
Shell with the valves external, broad, transverse; the hinder valve with 
the apex sub-central, superior. (PI. and A. Adams.) 
Example. Lepidochitona marmorea . 
Distribution. Greenland, Britain, Mediterranean, western America. 
SECTION TONICELLA Carpenter, 1873 
Lepidochitona marmorea Fabricius, 1780 
Fauna Gronlandica, 420. Tryon and Pilsbry, Manual of Conchology, 14:41; PI. 10, 
figs. 8—IS. 
Chiton testa oxtoualui subcarinata punctata striata, corpore ochreo. 
Testa crassa oblongo-ovalis, glabra, punctis confertis eminentibus vix 
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