270 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



CHONDROTHYRETES SHL'TTLKWORTHI (Pfciffcr) 



Pfeiffer, in describing Cyclostoma shuttleworthi, does not mention 

 a type locality for his species, but in his reference to it in the Mono- 

 graphia pneunionopoinorum in 1852, page 295, he states that his 

 specinien was in the Ciimings Museum. His figure in Martini- 

 Chemnitz Conchylien Cabinet, plate 36, figure 7, and also the descrip- 

 tion on pages 265-266, leave no doubt in our minds that this specimen 

 is one of the San Diego Banos complex. Poey, in describing Cyclos- 

 toma verecundum in his Memorias sobre la historia natural de la 

 Isla de Cuba, volume 1, pages 102-103, says that his specimens were 

 received from D. Jose Maria Velasquez who collected them at San 

 Diego de los Banos. 



Henderson and Simpson's exhaustive collecting in the region of 

 San Diego Banos in 1913, Bartsch's in 1928, as well as the more recent 

 collecting by Bermudez, Aguayo, and Natenson, have resulted in the 

 accumulation of a mass of material with definite localities, which en- 

 able us to fairly adequately understand the distribution of this species 

 and its breaking up into a definite series of zoogeographic races, which 

 we are designating as subspecies. 



These here, as elsewhere, have their definite physical limitations 

 and are undoubtedly segregation products, the results of erosion and 

 the isolation caused thereby. 



The species is confined to the Pinar del Rio Province and ranges 

 from San Diego Banos northward to the Sierra la Cumbre and La 

 Catalina, east of the Rio San Diego. It extends westward through 

 the mogotes facing the Sierra la Guira, as well as this sierra, then 

 westward through the Sierra Guacamayas, and from there southward 

 to Mogote Mamey. 



Shell ovate, varying from medium to rather large in size, varying 

 in ground color from flesh-color, through straw-color, through yellow 

 to orange and brown in different individuals, always Avitli soma spiral 

 markings. These may constitute definite bands or interrupted lines, 

 which if seeming absent are at least expressed as rays upon the ex- 

 panded peristome. The interrupted spiral markings are at times 

 so arranged as to constitute axial zones. Nuclear whorls about 2, 

 inflated, strongly rounded, smooth exce^)t the last portion of the last 

 v\'horl, which shows the feeble beginning of the postnuclear sculpture. 

 A small dark patch marks the suture of the first nuclear turn. Post- 

 nuclear whorls inflated, gibbose, marked by numerous, about equal, 

 and equally spaced axial and spiral threads, which in one group of 

 subspecies retain their strength on the last turn, while in another 

 group we find the axial threads decidedly reduced. Suture moderately 



