CLASS GASTROPODA 
249 
posterior valve with subcentral prominent mucro, the central area granu- 
lose, the periphery pustulose; intermediate valves with axially puncto- 
striate jugal area, lateral areas prominent by reason of the conspicuous 
pustules, which are relatively large for the size of the animal; the pleural 
tracts coarsely axially grooved, the grooves more or less distinctly punc¬ 
tate; girdle with crowded minute spines of equal length, giving an arena¬ 
ceous effect; interior whitish, the jugal sinus wide with a straight edge, 
the sutural laminae small, subtriangular. Length of dry animal, 5; width, 
2; height, 0.7 mm. (Dali.) 
Type in United States National Museum, No. 218767. Type locality, 
Monterey, California. 
Range. Monterey to Catalina Island, California. 
Lepidopleurus belknapi Dali, 1878 
Proceedings of the United States National Museum, 1:1. Tryon and Pilsbry, Manual 
of Conchology, 14:7; Pi. 1, figs. 18-22. 
L. t. elongata, valde elevata, dorsualiter angulata; albida plus minusve 
cinereo et nigro tincta; valvis elevatis, apicibus distinctis; mucrone cen- 
trali conspicuo; sculptura ut in L. olveolo, sed granulis in areis dorsualis 
sparsim et quincuncialiter dispositis; valva postica sub apice concava, 
postice sinuata; zona minima spiculis tenuibus versus marginem munita. 
Long., 10; lat., 3 mm. Div. 90°. (Dali.) 
Shell elongated, much elevated, dorsally angled; whitish, more or less 
tinged with ashen or black. Valves elevated, with distinct apices; mucro 
central, conspicuous. Sculpture as in L. alveolus, but the granules of the 
dorsal areas sparse, and disposed in quincunx. Posterior valve concave 
below the apex, sinuated behind. Girdle narrow, having delicate spicules 
toward the margin. (Dali.) (Tryon and Pilsbry, Manual of Conchology.) 
Type in United States National Museum. Type locality, North Pacific 
Ocean, in lat. 53° 8' N., long. 171° 19' W., at a depth of 1,006 fathoms. 
Range. Off Aleutian Islands; off Luzon, Philippine Islands, 1,050 
fathoms. 
Described as Leptochiton belknapi Dali. 
Lepidopleurus luridus Dali, 1902 
Proceedings of the United States National Museum, 24:556. 
Chiton small, solid, narrow, of a lurid smoky color, darker on the 
lateral areas; girdle densely pilose, with whitish spicules; back rounded, 
with the jugum defined feebly, most conspicuous as a distinct mucro, 
mesially, on the intermediate valves; pleural areas divided by obscure 
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