■CUBAN ANNULARIIDAE — TORRE AND BAKTSCH 277 



rounded, narrowly, openly umbilicated, marked by the continuation 

 of the axial ribs, which here bear 3 scallops, the last being more acute 

 and marking the outer limit of the umbilicus. The umbilical wall is 

 also marked by the slender continuation of the axial riblets and by 

 five slender spiral threads. The last whorl is solute for about one- 

 tenth of a turn. Aperture subcircular; peristome double, the inner 

 slightly exserted; the outer broadly expanded on the outer and basal 

 lip, less so on the inner and parietal wall, very strongly fluted, the 

 flutings forming denticulation on the inner lip. In addition to this 

 the outer peristome is marked by slender, concentric laminae. Oper- 

 culum typically tudorid. 



The type, U.S.N. M. No. 493485, comes from Silla de Baez, west of 

 Baracoa, Oriente Province. It has 5.1 whorls remaining and measures: 

 Length, 8.6 mm.; greater diameter, 5.0 mm.; lesser diameter, 4.3 mm. 



The elongate-turreted form, the strong angulations on the middle of 

 the turns, and the strong differentiation of the axial riblets, which 

 gives it a somewhat scalariform aspect, differentiate this from all the 

 other Wrightudoras. 



TUDORA (WRIGHTUDORA) GUNDLACHI, new species 



Plate 28, Figure 1 



Shell small, elongate-conic, flesh colored, with a brownish flush. 

 Nuclear whorls 2, inflated, well rounded, microscopicjally granulose, 

 forming a small, almost muc^onate, apex, the last portion of the last 

 turn showing the beginning of the postnuclear sculpture. Postnuclear 

 whorls inflated, well rounded, marked by slender axial riblets, of which 

 62 occur on the first, 82 on the second, 144 on the third, and 172 on 

 the last. These riblets are expanded into auricles at the summit and 

 at the periphery, and where these two elements meet they sometimes 

 fuse. The spiral sculpture consists of mere indications of threads too 

 feebly expressed to be counted. Suture strongly constricted. Periph- 

 ery weakly angulated. Base short, well rounded, marked by the con- 

 tinuation of the axial riblets and by a single spiral thread, which is 

 a little nearer the umbilicus than the periphery. A strong spiral 

 thread marks the junction of the base and the periphery, and its 

 junction with the axial riblets renders these strongly scaUoped. The 

 umbilical wall is marked by the feeble continuation of the axial riblets 

 and by 8 rather strong spiral threads. Last whorl solute for one-fifth 

 of a turn. Aperture very broadly oval, almost subcircular; peristome 

 double, the inner moderately, strongly exserted but not reflected; the 

 outer narrowly expanded, strongly scalloped on the inner and basal 

 lip, and marked by a series of concentric lamellae. Operculum typi- 

 cally tudorid. 



