CHLOROSTOMA. 169 



granose line, separated by narrow impressed lines; periphery nearly 

 smooth ; base smooth or lirate, eroded in front of the aperture ; 

 aperture oblique, outer lip thick within, smooth, bevelled to an edge ; 

 columella oblique, bearing in the middle a heavy tubercle, at the 

 base less prominently toothed? Alt. 43, diam. 38 mill. 



W. Coast of Central America; Gulf of California. 



Trochus pellis-serpentis WOOD, Lid. Test. SuppL, t. 5, f. 4. PHIL- 

 IPPI, Conchyl. Cab., p. 105, t. 17, f. 4. FISCHER, Coq. Viv., p. 165, 

 t. 55. f. 3. T. strigilatus ANTON, VerzeicJmiss, p. 56. PHILIPPI, 

 Abbild. u. Beschreib., i, Trochus t. 2, f. 9. Tegula elegans LESSON, 

 Illustrations de Zoologie, t. 51 (1832). 



This species is the type of the subgenus Tegula. It differs from 

 the species of Chlorostoma with which I have associated it in the 

 heavier, larger columellar tubercle, more numerous whorls and differ- 

 ent color-pattern. 



C. GALLINA Forbes. PL 20, fig. 5 ; pi. 28, figs. 52, 53. 



Shell imperforate, heavy, solid, thick, conoidal, dark purplish or 

 blackish, longitudinally striped or speckled with whitish, the stripes 

 occupying the interstices between close, narrow superficial folds of 

 the surface, which may be well-marked, or obsolete, continuous or 

 cut into granules by equally close spiral furrows, the latter some- 

 times predominating ; spire conoidal, the apex usually blunt, eroded 

 and yellow; body-whorl rounded at the periphery; base convex, more 

 or less eroded in front of the aperture ; whorls 5 to 6 ; aperture 

 oblique ; outer lip black-edged, smooth and pearly within ; columella 

 short, arcuate, strongly bidentate near the base : place of the 

 umbilicus marked by a pit. Alt. 28-40, diam. 26-34 mill. 



California; L. California. 



Trochus (Monodonta} c/allina FORBES, P. Z. S., 1850, p. 271, t. 11, 

 f. S. T. aallina FISCHER, Coq. Viv., p. 358, t. Ill, f. l.T.pyri- 

 formis GOULD, Proc. Bost. Soc. A r . H., 1853, p. 382. 



The above description applies to the typical form ; the sculpture 

 of the surface is superficial and very variable, as is the distribution of 

 the color markings, which is dependent upon the sculpture. It is 

 sometimes difficult to separate this from C. funebrale. See remarks 

 under that species. 



Var. TINCTA Hemphill. 



In this form the longitudinal markings and sculpture are obsolete 

 and the spiral grooves generally scarcely visible above ; the color is 



