CUBAN ANNULtAKiroAE TORRE AND BARTSCH 275 



/ TUDORA (AGUAYOTUDORA) OBESA, new species 



Plate 27, Figure 9 



Shell elongate-ovate, rather stout, ranging in color from flesh color 

 to pale chestnut-brown, ^^dth or without interrupted spiral bands of 

 brown. Nuclear whorls 2, well rounded, microscopically granulose, 

 forming a small apex. Postnuclear whorls marked by retractively 

 curved axial riblets, which are rather irregular in strength and slightly 

 so in spacing. They are about as wide as the spaces that separate 

 them, and those of the early whorls are somewhat wavy or slightly 

 nodulose. On the later turns this character is lost. The axial riblets 

 become slightly exserted at the summit, particularly so on the early 

 turns, where they also become somewhat thickened at the periphery. 

 On the last whorl, however, these characters are lost. Suture strongly 

 constricted. Periphery inflated, well rounded. Base moderately 

 long, well rounded, marked by the continuation of the axial ribs. 

 Umbilicus narrow, open, bearing 9 slender spiral threads, which 

 render the axial ribs nodulose. Last whorl solute for about one- 

 tenth of a turn. Aperture oval, rendered crested by a carina at the 

 posterior angle; peristome simple. Operculum typically tudorid. 



The type, U.S.N. M. No. 493484, comes from the Sierra del Ca- 

 chimbo, that is, between the Sierra de Chorrillo and the Sierra Najaza, 

 Camagiiey Province. It has lost the nuclear turns. The 4.2 whorls 

 remaining measure: Length, 13.6 mm.; greater diameter, 8.2 mm.; 

 lesser diameter, 6.7 mm. 



Wrightudora, new subgenus 



Shell small, elongate-ovate. Nuclear whorls inflated, w^ell rounded, 

 microscopically granulose. Postnuclear whorls with lamellar or sub- 

 lamellar vertebrated axial ribs, which may or may not be gathered 

 into tufts at the summit. Umbilicus open. Aperture subcircular; 

 peristome double. Operculum typically tudorid. No breathing 

 device is present. 



Type: Tudora {Wrightudora) enode ([Gundlach] Pfeiffer). 



KEY TO THE SPECIES OF THE SUBGENUS WRIGHTUDORA 



Axial ribs gathered into tufts at the summit enode 



Axial ribs not gathered into tufts at the summit. 



Whorls strongly angulated in the middle arcticoronata 



Whorls not strongly angulated in the middle. 



Axial ribs uniform in strength and spacing gundlachi 



Axial ribs not uniform in strength and spacing. 



Axial ribs scalloped semicoronata 



Axial ribs not scalloped garridoiana 



223580 — iO 10 



