272 PROCEEDINGS OF THE NATIONAL MUSEUM Vol.89 



TUDORA (AGUAYOTUDORA) ASPERATA, new species 



Plate 27, Figure 5 



Shell elongate-ovate, white. Nuclear whorls 2, inflated, strongly 

 rounded, forming a small mammillated apex. Postnuclear whorls 

 inflated, strongly rounded, and marked by lamellar axial ribs, between 

 which 1 or 2 finer axial ribs may be present. The lamellar ribs are 

 decidedly scalloped, having the appearance of being rendered so by 

 the spiral cords, which are not present in the intercostal spaces. Five 

 of these scallops are present between summit and the periphery. 

 The scallops at the periphery and the expanded riblets at the summit 

 of the succeeding turns interlock on the early turns. Suture strongly 

 constricted. Periphery weU rounded. Base short, narrowly, openly 

 umbilicated, marked by the continuation of the axial ribs, which bear 

 3 scallops. The umbilical wall also bears the continuation of the 

 axial ribs and 4 feeble threads on the exposed portion. Last whorl 

 slightly solute. Aperture very broadly oval, almost circular, peri- 

 stome simple. Operculum typically tudorid. 



The type, U.S.N.M. No. 493448, comes from El Cacaotal in the 

 Sierra de Najaza. It has 6.2 whorls and measures: Length, 12.8 

 mm.; greater diameter, 6.9 mm.; lesser diameter, 5.3 mm. 



The strong scallops on the ribs differentiate tliis at a glance from 

 all the other Aguayotudoras. 



TUDORA (AGUAYOTUDORA) TUBERCULATA. new species 



Plate 27, Figure 2 



Shell elongate-ovate, varying in color from flesh colored to chestnut- 

 brown. The paler forms show conspicuous, interrupted spiral bands 

 of brown. Nuclear whorls decoUated in all our specimens. Post- 

 nuclear whorls strongly inflated, marked by retractively curved axial 

 riblets, which are not all of the same strength; heavier ones are inter- 

 spersed with 1 or 2 finer elements. The axial ribs are tuberculated, 

 but no spiral threads appear to be present in the intercostal spaces. 

 The tubercles are best developed on the early whorls, 6 being present 

 between summit and sutiu-e on the second, and 7 on the third. On 

 the last whorl they become enfeebled. Suture strongly constricted. 

 Periphery inflated, wefl rounded. Base short, inflated, strongly 

 rounded, broadly, openly umbilicated, marked by the continuation 

 of the axial ribs and by 3 rows of tubercles, which here almost con- 

 stitute spiral tlu-eads. The umbilical waU has 10 spiral threads, 

 which render the ax-ial ribs nodulose. The last whorl is solute for a 

 tenth of a turn. Aperture broadly oval; peristome simple. Oper- 

 culum typically tudorid. 



