196 PROCEEDINGS Of THE NATIONAL MUSEUM vol.93 



GLYPHEPITHEMA,* new genus 



Shell globose, spire short, whorls smooth, except for subobscurs, 

 axial, retractively curved furrows on the upper portion of the penulti- 

 mate whorls; last whorl flattened below the suture, covered by a thin 

 brownish periostracum, which is strongly wrinkled below the suture. 

 Color pale gray-brown to white, encircled by four narrow bands of 

 deep chestnut spots on a white ground. Umbilicus broad, with a 

 stout funicle. Operculum with a variously shaped nuclear callus, 

 after which comes a broad rib formed by the rather complete fusion 

 of two or three smaller ribs. Between this rib and the outer margin 

 lie several smaller, unequal ribs, the outer ones usually variously 

 sculptured and often joined at the top by a sculptured calcareous de- 

 posit roofing over the interspaces. 



Genotype: Natwa idiopoma Pilsbry and Lowe, 1932. 



This naticid genus is closest to Stigmmdax Morch, having a rather 

 similar operculum and umbilical region. The operculum does differ, 

 however, and the shell is not strongly sculptured as in Stigmaulax. 

 This group has a fossil history parallel to that of Stigmaulax, for 

 Woodring (Miocene Mollusks from Bowden, Jamaica, pt. 2, Carnegie 

 Inst. Washington Publ. 385, p. 382, pi. 30, tier. 9, 1928) figures an 

 operculum that undoubtedly belongs to an as yet undiscovered species 

 of this genus occurring in the Miocene of the Antillean region. 



Besides the genotype, which occurs from Cape St. Lucas to Panama, 

 this group includes the closely related G. floridana, described below, 

 and Xatica turtoni E. A. Smith from St. Helena. Natica alapapilionis 

 Roeding from the Philippines and India also seems to belong here, a 

 fresh specimen from Ho Ho agreeing generically in every particular 

 except for a slightly atypical operculum. Natica broderipiana Recluz 

 from the Gulf of California to Panama may also be placed here, 

 although it more strongly sculptured and the operculum is not 

 quite normal. The presence of a Philippine species in this otherwise 

 zoogeographieally homogeneous group seems anomalous, and perhaps 

 a study of the radulae and anatomy of the species under discussion 

 may reveal a difference in the Indo-Pacific member. 



GLYPH EPITHEMA FLORIDANA, new species 



Plate 19, Fiuuees 19-21 



Shell globose, stout, last whorl very large, spire small, conical. 

 Nucleus of -2\._, whorls sculptured with microscopic spiral lines, the 

 following postnuclear whorls smooth except for rather deep, retrac- 

 tively slanting, axial grooves, which reach only to the shoulder; post- 



* y\ii(j>u.-, to tarve, cngravc+<l;ri0>;Ma, lid. 



