62 SCURRIA. 



Numerous specimens of all the following species have been exam- 

 ined by the author. 



S. scuRRA Lesson. PI. 39. figs. 16, 23, 24, 25, 26, 27. 



Shell solid, straightly conical, elevated, the outline short oval, or 

 nearly round, apex sub-central. Surface smooth, having fine incon- 

 spicious radiating stride and concentric lines of growth. Color light- 

 brown or buff, outer layer with a waxen translucency. 



Specimens are not infrequent in which the growth has been inter- 

 rupted, producing an abrupt change in the color, or giving the steep, 

 volcano-like cone, a terraced appearance. The apex, when retained, 

 has the shape of a tiny Lottia gigantia. It lacks radiating striae, 

 but is colored with several brown stripes, as shown in figs. 23, 24 

 of PI. 39. The interior is pure white. 



Length 32, breadth 28, alt. 18 mill. 



Length 27, breadth 22, alt. 22 mill. 



12° to 41° S. Lat. West Coast of South America. 



Patella scurra Less., Voy de la Coquille, ZooL, p. 421, 1830. — 

 Acmcea scurra Orb. Voy. Amer. Merid. v, p. 478, t. 64, f. 11-14. — 

 Gay, Hist. Chile, Zool. viii, p. 252, Atlas t. 4,.f. 11.— Scurria 

 scurra Gray, P. Z. S. 1847, p. 171. — Dall, Amer. Jour. Conch, vi, 

 263.— ivo«ia^9a^^tdaSBY., Moll. Beechey's Voy. p. 147, t. 39, f. 1, 

 1839.— Lottia conica Gld., Moll. U. S. Expl. Exped. p. 346,— 

 Acmcea cymbula Hupe in Gay, Historia de Chile, Zool. viii p. 252, 

 Atlas, t. 4, f. 12, 1.854. 



This straightly conical species resembles the Californian Acmcea 

 mitra Esch. in form. It differs in being of a buff" color, in the acute, 

 anteriorly directed apex, etc. 



S. zebrina Lesson. PI. 1, figs. 10, 11. 



Shell ovate, elevated, apex in front of the middle ; slopes some- 

 Avhat convex. Surface having 12 strong radiating ribs, about as 

 wide as their interstices or narrower ; these ribs making the margin 

 strongly notched, when their ends are not eroded. Ground color 

 greenish, the intervals between the ribs (or sometimes the whole sur- 

 face) closely marked with triangular black blotches. 



Inside smooth, muscle-scar white, scarcely impressed, the area 

 within it chestnut colored with a darker border, becoming lighter 

 with age, until in old shells it is almost entirely concealed by the 

 white layer. The area outside of the muscle-scar is white or slightly 



