CLASS GASTROPODA 
253 
Type in United States National Museum. Type locality, off San Pedro, 
in about 75 fathoms. 
Range. Monterey, California, to San Martin Island, Lower California. 
Described as Lcpidopleurus ( Oldroydia) percrassus . 
Genus HANLEY A Gray, 1857 
Anterior valve with an unslit insertions-plate; other valves destitute of 
the plates. (Tryon, Structural and Systematic Conchology.) 
Type. Chiton debilis, Gray. 
Distribution. Mostly northern, one from deep waters of Gulf of 
Mexico. 
Hanleya hanleyi Bean, 1844 
Thorpe, British Marine Conchology, 263, fig. 57. Tryon and Pilsbry, Manual of Con¬ 
chology, 14:17; PI. 3, figs. 71-79. 
Shell oblong oval, narrow, carinated, brownish-white, granulated, with 
the granulations larger toward the margin which is covered with minute 
spines; inside pale green. Length, .3; breadth, V /2 lines. Only two speci¬ 
mens of this beautiful shell have been met with at Scarborough attached to 
the under sides of rocks at the lowest spring tides. (Bean.) 
Shell oblong, convex, the lateral slopes nearly straight, the dorsal ridge 
rather angular. Sculpture consisting of numerous rounded tubercles, ar¬ 
ranged in longitudinal rows on the central areas, the series of tubercles 
finer and closer upon the jugum; head plate and lateral areas having 
coarser rather irregular tubercles. The lateral areas are not raised. The 
mucro is median, rather elevated. The plates of insertion of posterior and 
intermediate valves are obsolete, edges roughened; anterior valve having a 
short, acute insertion plate outwardly rugose-sulcate, the sulci indenting, 
but scarcely slitting the margin. Sutural plates moderate; sinus very wide, 
denticulated by the sculpture of the outside. Eaves very small. Girdle 
narrow, beset with numerous short and longer horn-colored spicules. 
Length, 10; breadth, 5 mm., sometimes larger. (Tryon and Pilsbry, Man¬ 
ual of Conchology.) 
Type in British Museum? Type locality, Scarborough. 
Range. Plover Bay, Bering Strait, to Monterey, California. Also 
Atlantic. 
Hanleya hanleyi spicata Berry, 1919 
Proceedings of the California Academy of Sciences, 4th series, 9:8; PI. 1, fig. 3. 
Shell small, oblong, rather elongate, lateral outline nearly straight. 
Valves sharply beaked; lateral areas distinct, but not conspicuous except 
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