244 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



1920. Chondrothyni {Chondroihiiretcs) sinuosa Henderson and Bartsch, Proc. 

 U. S. Nat. Mus., vol. 58, p. 64. 



Pfeifl'er, in his Novitates concliologicae, plainly tigures the large 

 shell of pale ground color with conspicuous interrupted dark bands, 

 which occupies the %yest side of the Puerta de la Ancon. We have 

 here collected hundreds of specimens that in every way agree with 

 Pfeifl'er's description and figure. 



The specimen here figured, U.S.N.M. no. 57614, was collected by 

 Arango at Vinales. It has 5.0 whorls remaining and measures: 

 Length, 25.5 mm; greater diameter, 14.5 mm; lesser diameter, 11.0 

 mm. 



TURRITHYRA (TURRITHYRETES) SINUOSA OPPOSITA, new subspecies 



Plate 14, Figure 15 



This race occupies the opposing wall of the Puerta de la Ancon 

 from that inhabited by typical T. (T.) sinuosa sinuosa, that is, the 

 west wall of the Sierra de la Chorrera at the Puerta. It resembles 

 typical T. (T.) sinuosa sinuosa but differs from it in being much 

 smaller. 



The type, U.S.N.M. no. 492723, has 4.6 whorls remaining and meas- 

 ures: Length, 21.7 mm: greater diameter, 12.0 mm; lesser diameter, 

 8.4 mm. 



TURRITHYRA (TURRITHYRETES) SINUOSA RHACHITICA, new s^ubspecies 



Plate 14, Figure 6 



This race occupies Mogote Puertecitas, the block of limestone a little 

 east of the southeastern end of the Sierra de la Chorrera. It is the 

 smallest subspecies and it is likewise slenderer and practically alwaj^s 

 white: only an occasional specimen shows indicatious of interrupted 

 spiral bands. 



The type, U.S.N.M, no. 468733, is a complete specimen having 8.5 

 whorls and measures: Length, 21.3 mm; greater diameter. 8.5 mm; 

 lesser diameter, 7.0 nmi. 



TURRITHYRA, new subgenus 



Those Turrithyras that possess a breathing pore and have the re- 

 flected inner lip uncut. 



Type: Turrifhi/ra {Turrifhi/ra) canaliculata (Gundlach) Pfeiifer. 



KEY TO THE SPECIES OF SUBGENUS TURRITHYRA 



Outer peristome broadly expanded. 

 Axial sculpture threadlike. 



Spiral sculpture stronger than the axial mendax 



Spiral sculpture not stronger than the axial canaliculata 



