294 PROCEEDINGS OF THE NATIONAL MUSEUM Vol.89 



them nodulose. Aperture circular ; peristome double, the imier slightly 

 exserted; the outer very broadly expanded on the inner lip and the 

 parietal wall, less so on the outer and basal lip, deeply notched on the 

 middle of the inner lip, and reflected posterior to this over the umbihcus 

 as a strong callus. Operculum typically annularid. 



This species ranges through the Organ Mountains and adjacent 

 mogotes from Sumidero and Pan de Azucar east to the Sierra de 

 Galalon. 



The following key and brief diagnoses will help to differentiate the 

 three subspecies here recognized : 



KEY TO THE SUBSPECIES OF ANNULARIA (ANNULAROPS) SEMICANA 



Shell large, height more than 12 mm. 



Shell flesh colored semicana 



Shell reddish organicola 



SheU small, height less than 11 mm nana 



ANNULARIA (ANNULAROPS) SEMICANA SEMICANA (Morelet) 



Plate 30, Figure 10; Plate 31 



1851. Cyclostoma semicanum Morelet, Testacea novissima insulae Cubana et 

 Americae Centralis, pt. 2, p. 20. 



Morelet cites the southern part of the Isle of Pines as type locality 

 for this species. All the intensive subsequent collecting in this island 

 by de la Torre and Bartsch and others has failed to produce anything 

 corresponding to Morelet's fine description. Dr. de la Torre examined 

 Morelet's 3 cotypes in the British Museum, and he and Bartsch agree 

 that the name should be applied to the present race. Thanlis to the 

 kind helpfulness of the authorities of the British Museum, it is possible 

 to reproduce photographs of Morelet's specimens and thereby to 

 dispel any doubt that might be entertained about the authors' con- 

 tentions that semicanum belongs to the Organ Mountain fauna and 

 not to that of the Isle of Pines. We are restricting the name A. (A.) 

 semicana semicana to the race occupying the southern border of the 

 Sierra Galalon. 



It differs from the neighbor to the west, A. (A.) semicana organicola 

 in being shorter, which gives it a more rotund appearance, and in 

 being flesh colored instead of reddish. 



The specimens figured on plate 31 are photographs of Morelet's 

 cotypes in the British Museum, while figure 10, plate 30, shows one 

 of a series coUected by Natenson north of Ceja de Galalon, U.S.N.M. 

 No. 493460. This specimen has 3.4 whorls remaining and measures: 

 Length, 15.0 mm.; greater diameter, 11.8 mm.; lesser diameter, 9.2 

 mm. A smaUer specimen from the same locality having 3.3 whorls 

 measures: Length, 12.6 mm.; greater diameter, 9.9 mm.; lesser 

 diameter, 7.9 mm. 



