376 PROCEEDINGS OF THE NATIONAL MUSEUM Vol.89 



for the last portion of the last turn, which shows the beginning of the 

 postnuclear sculpture. Postnuclear whorls strongly rounded, the 

 first one marked by 42 rather distantly spaced axial threads, while 

 on the second there are 64. On this turn intercalated ribs between 

 the stronger are making their appearance. These become much more 

 strongly developed on the last turn, where 112 are present. Suture 

 deeply channeled. Periphery strongly rounded. Base well rounded, 

 openly umbilicated, marked by a strong spiral cord at the junction 

 of the base and umbilicus. The umbilical wall is marked by the 

 continuation of the axial riblets, which here become considerably 

 enfeebled, and 5 feeble spiral threads. Last whorl solute for one- 

 fourth of a turn. Aperture broadly oval; peristome double, the outer 

 broadly expanded, forming a conspicuous auricle at the posterior 

 angle; the inner moderately exserted, strongly reflected all around 

 except at the posterior angle and almost appressed to the outer 

 peristome. Operculum typically annularid. 



The type, U.S.N.M. No. 356284, collected by Arango, comes 

 from the ancient Ingenio El Coco, Sagua de Tanamo, Oiiente Province. 

 It has 4.9 whorls and measures: Length, 9.4 mm.; greater diameter, 



10.3 mm. ; lesser diameter, 7.4 mm. A topotype, U.S.N.M. No. 356285, 

 has 4.3 whorls and measures: Length, 8.8 mm.; greater diameter, 



10.4 mm.; lesser diameter, 9.6 mm. 



This species can easily be distinguished from the others by the 

 conspicuous reddish coloring of the tip. 



ANNULARIA (ANNULARELLA) LIBANOENSIS. new species 



Plate 53, Figures 7-9 



Shell rather large, broadly turbinate, flesh colored. Nuclear whorls 

 a little more than 2, strongly rounded, forming a well elevated apex, 

 which conforms with the outline of the rest of the spire, and which 

 has the whorls microscopically granulose. Postnuclear whorls well 

 rounded, marked by retractively curved axial riblets, in which the 

 stronger elements are scarcely differentiated from the intercalated 

 riblets. Of these riblets 41 occur on the first turn, 69 on the second, 

 and 174 on the third and two-tenths whorls completing the spire. 

 These riblets terminate at the summit in slender cusps. Suture 

 narrowly but rather deeply channeled. Periphery slightly angled. 

 Base short, well rounded, and marked by the continuation of the axial 

 riblets and by a weak spiral thread posterior to the strong cord, limiting 

 the umbilicus. The base is openly umbilicated, and shows many 

 spiral threads, as well as the closely crowded axial riblets, on the 

 umbilical wall. The last whorl is solute for about one-tenth of a turn. 

 Aperture almost circular; peristome double, the inner peristome quite 

 strongly exserted and reflected to fuse with the outer on the outer lip ; 

 outer peristome moderately, broadly expanded on the outer lip, more 



