CUBAN ANNULAEIIDAE TORRE AND BARTSCH 141 



interdigitate. These riblets are less elevated on the later turns; 

 they are more distantly spaced on the early turns, and they become 

 increasingly more approximated. Thirty-three are present on the 

 first of the remaining turns, 44 on the second, 69 on the third, 103 on the 

 fourth, and 102 on the last. The early whorls show by their slight 

 waviness and scalloping indications of spiral sculpture, which evanesces 

 on the later turns. Suture moderately constricted. Periphery well 

 rounded. Base rather long, well rounded, and marked by the continu- 

 ation of the axial riblets and by 4 spiral cords, which are of equal 

 strength and spacing. The third of these marks the periphery of the 

 closed mnbilicus, while the last one is on the umbilical wall. These 

 spiral cords render the axial riblets crenulated at their junction. 

 Aperture broadly ovate; peristome double, the outer flaringly expanded, 

 pinched in on the columellar wall to close the umbilicus, and narrower 

 on the parietal wall than on the rest of the peristome ; the iimer slightly 

 exserted, slightly reflected and appressed to the outer. The siphon 

 and operculum of this species are described under the genus. 



The type, U.S.N.M. No. 535480, was collected by Torre at El 

 Purio, Encrucijada, Santa Clara Province. It has 5 whorls remaining 

 and measures: Length, 12 m.m.; greater diameter, 15.7 mm.; lesser 

 diameter, 5.1 mm. 



A young, half-grown specimen shows a wide-open umbilicus. 



This species is rather widely distributed in Santa Clara Province. 

 In addition to the type locality and the regions adjacent to this, we 

 have seen it from Loma Batey del Ingenio Santa Clara, near Cala- 

 bazar; Cueva Galana, Finca Miradero, Loma Ortiz, La Viruela; La 

 Sierra, Loma Sola, Potrero Penton, Loma Chicharron near Vega Alta, 

 and Las Jumaguas near Sagua. 



Description of the animal of specimens collected by Bartsch at 

 Potrero Penton is as follows: The upper portion flesh colored, with 

 many fine dots of gray, with a pinkish area behind the tentacles, 

 which are grayish flesh colored tipped with pale lemon yellow; the 

 sides of the body are pale olivaceous, which is also the color of the tip 

 of the snout and of the deeply cleft sole of the foot. The animal 

 moves either with a direct motion or with a lateral jerk of the shell. 



OPISTHOCOELICUM (OPISTHOCOELICUM) LAMELLICOSTATUM (Torre and Henderson) 



Shell elongate-ovate, ranging in color from pale yellow to pale 

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

 forming a somewhat truncated apex. Postnuclear whorls inflated, 

 strongly rounded, marked by lamellar or sublamellar axial ribs, 

 which are slightly or decidedly fluted. This fluting is best expressed 

 on the early whorls. The ribs become expanded at the summit into 

 conspicuous auriclelike denticles, which usually touch the axial ribs 

 of the preceding turn. The intercostal spaces are much wider than 



