262 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
The mucro of the posterior valve is slightly post-median, but little raised, 
the slope behind it being convex toward the edge. The interior is white, 
stained buff or pinkish near the sinus, where it is conspicuously porous. 
The eaves are wide and closely porous throughout. Teeth smooth, those 
of the posterior valve being directed forward. Girdle is densely covered 
with minute elongate scales. Length, about 17; width, 12 mm. (San 
Pedro.) Length, about 19; width, 13 mm. (San Pedro.) Length; about 
16; width, 11 mm. (White Point.) (Pilsbry.) 
Type in Academy of Natural Sciences, Philadelphia, No. 117955. Type 
locality, San Pedro, California. 
Range. San Pedro, California. 
Described as Trachydertnon lowei Pilsbry. 
Lepidochitona fackenthallae Berry, 1919 
Lorquinia, January 1919, 5. 
Chiton of moderate size, best described in few words by comparison 
with C. lowei Pilsbry, which it resembles very closely, but is apparently 
somewhat larger; light brown in color; has the eaves lower, very much 
more finely porous, and (especially on valvei) more decidedly projecting; 
has less pronounced sculpture, though of similar nature to that of C. lowei, 
and the head valve less crenulate; interior pure white instead of tinted: 
tail valve with fewer (10 instead of about 13) blunter and coarser teeth; 
all valves have a much less porous sinus and lines leading into slits. 
( Berry.) 
Type in Berry Collection. Type locality, Pacific Grove, California. 
Range. Known only from type locality. 
Lepidochitona raymondi Pilsbry, 1894 
Nautilus, 8:46. 
Shell longer and narrower than T. Hartwegii . Back somewhat keeled, 
varying in elevation. Color (1) olivaceous green mottled with white, some¬ 
times with dark lateral streaks as in Hartwegii, sometimes ruddy at the 
ridge, of (2) uniform blackish, or (3) dark brown, uniform or with 
whitish flecks. Valves rather strong, slightly beaked when unworn, the 
posterior (sutural) margins straight or slightly concave. Intermediate 
valves rather rounded where they join the girdle, scalloping the inner 
border of the latter; not distinctly divided into areas. Lateral area hardly 
or not raised (the diagonal being indistinct) evenly sculptured with minute, 
equal granules. Central areas also evenly sculptured throughout with 
similar granules, slightly finer on the ridge. End valves with the same 
[864] 
