THE NAUTILUS. 



VOL. XXX. SEPTEMBER, 1916. No. 5 



A NEW CUBAN ZACHRYSIA. 



BY JOHN B. HENDERSON. 



PLEURODONTE (ZACHRYSIA) TORREI n. sp. PI. I. 



Imperforate, depressed, solid, straw color with russet streaks 

 strongly arched forward, darker just behind the aperture. Four 

 whorls, first -| subtly spirally lirate and then malleated ; the 

 rest finely costulate striate, the striae arching forward and 

 becoming wavy and complicated on the last whorl, and especially 

 in the peripheral region, by two sets of revolving striae, one 

 microscopically fine, giving under the lens a wrinkled appear- 

 ance. There is a smooth shining area about the base. Last 

 Avhorl abruptly descending in front, strongly carinated, the 

 carina directed upward, so that the whorl is concave above and 

 convex below except in the last \ whorl, where the carina is 

 less obvious and the whorl becomes swollen and convex above. 

 The outline of the final \ whorl is nearly straight, and bulges 

 out into a gibbous ring about the aperture. Aperture small, 

 very oblique, truncate oval. Peristome thickened, slightly ex- 

 panded, white ; basal margin horizontal, nearly straight, form- 

 ing an obtuse angle with the curved outer lip ; obsoletely 

 toothed near the insertion of the columella. 



Major diam. 31 ; min. diam. 25 ; height 17 ; ap. (inside) 11 

 by 8^ mm. 



Locality: Farallones de Canipu, " Cayo del Rey' : in the 

 Mayari hills of Oriente Province, Cuba. 



The shell has a lop-sided appearance, attenuated on the left, 

 and swollen on the right side. The peculiar shape suggests a 



