CUBAN AN:N'ULARIIDAE TORUE AND' BARTSCH 203 



lamellar axial ribs, which are separated by spaces a little wider than 

 the ribs. Some of these ribs become fused to form hollow cusps at 

 the summit. Of these ribs 118 are present on the last whorl. These 

 ribs have indications of fine scallops, which would lead one to believe 

 that spiral threads were present. Under the microscope the fact is 

 revealed that the mtercostal spaces are free of spiral threads. Of these 

 scallops 15 are present between summit and peripheiy on the last 

 turn and 5 are on the base. In the latter place they become increas- 

 ingly stronger from the periphery toward the umbilicus. Within the 

 umbilicus stronger spiral threads are present, which render the axial 

 ribs decidedly scalloped. Suture strongly impressed. Periphery 

 well roimded. Base rather short, well rounded, narrowly, openly 

 umbilicated. Aperture very broadly oval, almost subcircular; peri- 

 stome double, the inner rather strongly exserted and straight; the 

 outer broadly expanded and obliquely reflected, notched in the middle 

 of the inner lip and reflected over the peristome posterior to the notch 

 as a broad flap, which extends over and is adnate to the preceding turn 

 at the parietal wall. The outer peristome forms a fairly conspicuous 

 auricle at the posterior angle, and it is marked by concentric lamellae. 

 The siphon is at the posterior angle, behind the peristome, and is 

 reflected into the suture. 



The type, U.S.N.M. No. 535472, has 4.3 whorls remaining and 

 measures: Length, 14.1 mm.; greater diameter, 8.8 mm.; lesser 

 diameter, 7.0 mm. 



This species was collected by Bartsch on Signal Hill, Turiguan6 

 Island, on the north coast of Camagiiey. It is named for A. A. 

 Quint, who was very helpful to him durmg his stay on Turiguan6. 



OPISTHOSIPHON (CUBIT ASIPHONA) M AN ATIENSE, new species 



Plate 16, Figure 4 



Shell elongate-ovate; early whorls pale brown, the rest almost white 

 in the type, which is a dead specimen. Nuclear whorls decollated. 

 Postnuclear whorls well rounded, marked by slightly retractively 

 curved axial ribs, which are sublamellar and rather distantly spaced 

 on the first turn, and which gradually change as the whorls progress to 

 low, rounded, closely approximated elements. These ribs are gathered 

 into hollow tufts at the summit, at irregular intervals. There are 

 52 on the first of the remaining turns and 93 are on the last whorl. 

 Suture strongly constricted. Periphery inflated, well rounded. Base 

 moderately long, well rounded, marked by the continuation of the 

 axial ribs and by several spiral threads. Spiral threads apparently are 

 also present within the umbilicus. These spu-al threads render the 

 axial riblets scalloped at their junctions. Aperture broadly oval; 

 peristome double, the inner well exserted; the outer expanded, being a 



