250 PROCEEDINGS OF THE NATIONAL MUSEUM Vol.89 



This species is known only from Santa Clara Province. It is tre- 

 mendously variable throughout its range as far as size and sculpture 

 are concerned. There appears to be no constancy in the variation 

 that would show a relationship to the zoogeographic areas occupied. 

 We are therefore refraining from attempting to split it up into sub- 

 species. While the extreme variations in a single locality are much 

 greater than are frequently represented in zoogeographic races of a 

 species, here fixation apparently has failed to become effective. 



Forty lots before us range from the type locality south to Soledad 

 to Guayos eastward to San Isidro and Loma El Capiro, and Loma de 

 Bonachea to Loma de Santa Fe. On the north coast, following the 

 range of mountains from the west eastward we have seen it from 

 Corralillo, Santa Teodosia, Pilar, Ramona, Lutgardita, Zambumbia, 

 Flor de Cuba, Finca Delicia, Capitolio, Jumaguas, Arboleda, Loma 

 de la Viruela, Finca el Miradero, Finca Oriente, Finca Santa Clara, El 

 Purio, Mogote de la Sierra, El Guajen, El Rinc6n, Loma Sola, El 

 Hacha, Loma Murcielagos, El Palenque, La Puntilla, Charco Maja, 

 Mogote de Ramon Martinez, Central San Augustin, Mogote Buena 

 Vista, Cayo Conuco, Cerro de Guajabana, Sierra de Meneses opposite 

 Juncalito, east of Yaguajay, and Sierra de Jatibonica at Los Broqueles. 



Bartsch collected living specimens of this species at Central San 

 Augustin on Mogote de Ramon Martinez, August 6, 1928. He de- 

 scribed it as flesh colored with a slight grayish area between the ten- 

 tacles, showing a pinkish tinge. The upper portion of the side of the 

 body ashy, the tentacles varying from flesh colored to pale yellow. 

 Sole of the foot medially cleft, flesh colored. The animal suspends 

 itself by a mucous thread when it is at rest. 



EuTUDOREX, new subgenus 



Small tudorids of ovate or elongate-ovate outline, with lamellar or 

 sublamellar, wavy axial ribs. The spiral sculpture on the spire may 

 be obsolete or consist of strong cords. The umbilicus may be open 

 or closed. Aperture almost circular; peristome double. The outer 

 peristome may be notched on the inner lip or it may be entire. Oper- 

 culum typically tudorid. A breathing pore is present on the parietal 

 wall near the posterior angle, a little within the edge of the peristome. 



The members of the subgenus are confined to Pinar del Rio Province. 



Type: Tudora (Eutudorex) rotundafa (Poey). 



KEY TO THE SPECIES OP THE SUBGENUS EUTUDOREX 



Outer peristome of inner lip notched and reflected over the um- 

 bilicus. 



Spiral cords of spire very strong, broad, and closely spaced welchi 



Spiral cords of spire not very strong, or broad, or closely spaced. 

 Spiral cords of spire weak or obsolete. 



Axial ribs uniform rotundata 



