CUBAN ANNULtARIIDAE — TORRE AND BARTSCH 251 



Axial ribs not uniform. 



Axial ribs consisting of alternating strong and les- 

 ser series undosa 



Spiral cords of spire not weak or obsolete. 



Spiral cords absent pulverulenta 



Outer peristome of inner lip not notched or reflected over the um- 

 bilicus. 



Outer peristome decidedly expanded rocai 



Outer peristome moderately expanded. 



Axial ribs uniform complanata 



Axial ribs not uniform. 



Axial ribs consisting of alternating series of strong and 



lesser series troscheli 



TUDORA (EUTUDOREX) WELCHI, new species 



Plate 23, Figure 6 



Shell rather large, elongate-conic, flesh colored with a brownish 

 flush. Nuclear whorls decollated in all our specimens. Postnuclear 

 whorls well rounded, slightly shouldered at the summit, marked by 

 closely crowded, vertebrated axial ribs, of which 221 are present on 

 the last turn. The axial ribs are separated by mere lines; at inter- 

 vals, however, there is a little wider space, which evidently marks a 

 resting period. The spiral sculpture consists of low, broad, rounded 

 cords separated by narrow, impressed lines, which render the axial 

 riblets slightly nodulose. Of these cords, 7 are present between the 

 summit and the periphery. Suture strongly constricted. Periphery 

 well rounded. Base moderately long, well rounded, marked by the 

 continuation of the axial ribs and by 5 spnal cords, which are a little 

 stronger than those on the spire and render the axial riblets nodulose. 

 This type of sculpture extends into the umbUicus, which, however, is 

 covered by the reflected outer peristome of the inner lip. Aperture 

 broadly oval; peristome double, the inner slightly exserted; the outer 

 narrowly expanded on the outer and basal lip, broadly expanded on 

 the inner lip, on the middle of which it is notched, the portion posterior 

 to the notch being reflected to cover the umbihcus. On the parietal 

 wall the outer peristome is broadly expanded and adnate to the pre- 

 ceding turn, forming a slight hood at the posterior angle. Operculum 

 typically tudorid. 



The type, U.S.N.M. No. 493420, was collected by Dr. d'Alte 

 A. Welch at Sierra de Paso Real de Guane. It has 3.6 whorls and 

 measures: Length, 11.4 mm.; greater diameter, 5.9 mm.; lesser 

 diameter, 5.0 mm. 



