CUBAN SUBFAMILY CHONDROPOMINAE TORRE AND BARTSCH 287 



subspecies have this tendency. Nuclear whorls about 2, well rounded, 

 smooth, the last portion of the last turn showing the beginning of 

 the postnuclear sculpture. The postnuclear whorls are inflated, well 

 rounded, appressed at the summit, which is feebly denticulated and 

 marked by numerous, closely spaced, axial riblets and spiral threads 

 e(iualing the riblets in strength. This combination gives to the sur- 

 face the reticulated pattern responsible for this subspecific name. 

 Aperture broadly ovate. Peristome double; the inner somewhat 

 exserted and slightly reflected; the outer broadly flaringly expanded, 

 somewhat fluted, and marked by feeble concentric lamellae. The 

 outer peristome is cut in the middle of the inner lip, and the por- 

 tion posterior to the cut is reflected over the umbilicus as a heavy 

 callus, which also extends over the parietal wall. The breathing 

 pore is a conspicuous perforation on the parietal wall about as far 

 removed from the edge of the inner lip as it is from the posterior 

 angle. The operculum is thin, paucispiral, with submarginal nu- 

 cleus covered on the outside with a thin deposit of fine calcareous 

 granules which are arranged in a somewhat radiating pattern. 



The animal of G . reticulata encinarensls is flesh-color, with ashy 

 suffusions. Tentacles orange, tipped with brown at the slightly ex- 

 panded end; white at base. Feelers paler at edge. Foot deeply 

 medially cleft, flesh-color. Motion of the two sides alternate. 



The animal of G. reticulata reticulella is ashy gray with the fore- 

 head at the base of the tentacles white. The space between the 

 tentacles is marked by numerous very fine dark dots. Tentacles 

 orange-red, tipped with buff. Sole of foot short, light ash gray, 

 medially cleft. Motion alternate on the two sides. 



This subspecies ranges through the central part of the Organ 

 Mountains of Pinar del Rio Province, that is, from Hoyo San An- 

 tonio through La Mina west of Pan de Azucar and south to the 

 Kilometer 14 region between Vinales and Pinar del Rio, embracing 

 not only the main blocks of limestone, but also the isolated lumps 

 of the Laguna Piedras region and the blocks southwest of Vinales. 



As in the case of the other widely distributed species, this com- 

 plex breaks up into a series of zoogeographic races, each more or less 

 sharply delimited in its distribution. Thirteen of these we are here 

 designating as subspecies. 



Distribution of the subspecies of C. reticulata is shown in figure 94. 



KEY TO THE SUBSPECIES OF CHONDROTHYRETES RETICULATA 



Shell large, length more than 25 mm. 



Dark spiral band at summit present. 



Axial and spiral threads fine encinarensls 



Axial and spiral threads less fine costanerensis 



