148 STREPTOSTYLA. 



Much smaller than 8. shuttleworthi and the varieties sub- 

 ordinated thereto by Dr. von Martens, short in the spire, 

 markedly cylindrical, with the columella only weakly twisted. 

 The region around Monterey is very different in physical 

 characteristics from that inhabited by 8. shuttleworthi. It is 

 considerably further north than Streptostyla has heretofore 

 been found. 



10. S. CYLINDRACEA (Pfr.) Vol. I, p. 48. 



11. S. STREPTOSTYLA (Pfr.). Vol. I, p. 47, as 8. pfeifferi 



C. & F. 



110. S. STREPTOSTYLA Var. CONIFORMIS (Shuttl.). Vol. I, p. 



47 (includes 8. blandiana C. & F., I, p. 47). 



12. S. CONULUS v. Martens. PI. 28, fig. 60. 



Shell narrowly coniform, solid, very lightly striatulate, yel- 

 low, glossy. Spire moderate, obesely conic, the apex rather 

 obtuse. Whorls 7, a little convex, the penult, whorl double 

 the height of the preceding, the last whorl narrowing down- 

 wards, not deflexed at the aperture. Suture simple, marked 

 with a pale gray band, but no groove. Aperture narrowly 

 linear, a little dilated below; outer lip slightly arching for- 

 ward below the middle; columella thick, strongly twisted, 

 open. Length 14, diam. 5, aperture 9.5 mm. long, .66 mm. 

 wide above, 1.5 below (Marts.). 



Western Mexico: Sayula, State of Jalisco (Hoge). 



Streptostyla conulus MARTS., Biologia Centrali Amer. Moll., 

 p. 94, pi. 5, f. 15. 



"Only one specimen. Resembles in many points 8. coni- 

 formis, but is much smaller and yet very thick, so that it 

 cannot be young. It is also considerably more slender, with 

 proportionately longer spire" (Marts.). 



13. S. GRACILIS Pilsbry, n. sp. PL 28, fig. 66. 



Shell very narrow and slender, glossy, of a rather bright- 

 yellow color, weakly wrinkle-striate, biconic, widest at the 

 upper third of the length. Spire conic, the apex obtuse. 

 Whorls 6, but slightly convex, regularly increasing, the last 



