1 
CLASS GASTROPODA 
181 
Shell narrowly and profoundly perforate, rather thick, conoid, dull 
cinereous, ornamented with castaneous radiating flammules; whorls six, 
rather convex, spirally finely lirate, the lirae seven to eight on the penulti¬ 
mate whorl, five on the preceding; last whorl rounded, compressed below 
the suture above, somewhat convex beneath, and provided with about ten 
concentric lirae; aperture slightly dilated, ovate, the lip plicatulate within; 
columella thin in the middle, arcuate, concave, bearing two or three 
tubercles below; columellar callus thick, green, slightly impinging upon 
the umbilicus. Alt., 13; diam., 13 mm. (Fischer.) (Tryon and Pilsbry, 
Manual of Conchology.) 
Type in Museum, Hamburg. Type locality, not known to writer. 
Range. San Diego, California, to Tres Marias Island. 
Described as Trochus impressus Jonas. 
Tegula ligulatus Menke, 1850 
Zeitschrift fur Malakozoologie, 173. Tryon and Pilsbry, Manual of Conchology, 
11:177; PI. 29, figs. 58-60. 
Testa convexo-oblique conoidea, obtusiuscula, anfractibus quenque vel 
sex, convexuisculis, liris confertis subaequalibus argutis, granulosis cincta; 
granulis oblongis; squalide cinerea, nigro nebulosa; anfractu ultimo su- 
perius radiatim obsolete plicato; pagina infera convexo-planuiuscula; um- 
bilico aperto, spiraliter: sulcato; columella basi sinuato-truncata: sinu 
medio denticulo oblongo conspicuo instructo. Alt., 5.4; diam., 7 lin. 
(Menke.) 
This is an extremely variable form. The shell may be either very 
much depressed or as high as broad. It may be spirally sculptured with 
numerous narrow, unequal lirae, or as strongly cingulate as the preceding 
form. The best development of this variety is shown by the specimens 
before me from San Diego. They are elevated, turbinated, strongly gra- 
nose-lirate; the base is deeply eroded in front of the aperture; the color 
is brownish-yellow, with numerous, close, narrow, longitudinal, purplish- 
brown stripes, but the whole surface is so dingy that it appears uni-colored; 
the spiral lirae are subequal, the grains low and elongated in the direction 
of the lirae. The whorls are rounder than in C. viridulum, and the aperture 
decidedly smaller, and lacking green tinge on the columella. Alt., 22; 
diam., 22; alt., 14; diam., 18 mm. (Tryon.) 
Type in ? Type locality, Mazatlan. 
Range. Monterey, California, to Acapulco, Mexico. Fossil, Pleisto¬ 
cene, San Pedro. 
Called Trochus viridulus var. ligulatum by Tryon. 
[ 783 ] 
