10 PROCEEDINGS OF THE NATIONAL MUSEUM Vol.70 



moderately rounded, narrowly shouldered at the summit, crossed 

 by strong, slightly protractively slanting axial ribs, of which 14 

 occur upon the fourth and fifth of the remaining turns, 16 upon the 

 sixth, 18 upon the seventh, 22 upon the eighth, and 28 upon the last 

 whorl, upon which they are somewhat enfeebled and less regularly 

 developed and spaced. The intercostal spaces are about twice as 

 wide as the ribs and are crossed by six equally spaced incised spiral 

 lines, of which the second is about three times as wide as the first, 

 third, and fourth, while the fifth and sixth have about double the 

 width of the narrow ones. Suture strongly constricted. Periphery 

 of the last whorl well rounded, somewhat inflated. Base, short, mod- 

 erately rounded, marked by somewhat irregularly spaced and ir- 

 regularly developed fine spiral lines, of which there are more than 

 15. The exact number can not be determined on account of the 

 erosion of the base. Aperture short, almost subquadrate; posterior 

 angle obtuse; outer lip thin, showing the external sculpture within; 

 inner lip almost vertical, reflected over and appressed to the base 

 for almost half its length. 



The type, Cat. No. 340818, U.S.N.M., was dredged by A. G. Smith 

 in 10 fathoms off Del Monte, California. It has nine postnuclear 

 whorls and measures, length, 9.7 mm.; diameter, 2.7 mm. This 

 species is nearest related to TurboniUa {Pyrgiscus) auricoma Car- 

 penter and Turhonilla {Pyrgiscus) castanea Keep. 



TURBONILLA (MORMULA) ENNA. new species 



Plate 2, fig. 8 



Shell elongate-conic, pale brown. Nuclear whorls decollated. 

 Postnuclear whorls marked by very slightly restractively slanting, 

 low, poorly developed, axial ribs which are a little broader than the 

 spaces that separate them. Of these ribs, 18 occur upon the second, 

 22 upon the third and fourth, 24 upon the fifth and sixth, 26 upon 

 the seventh, while upon the remaining turns they become more irreg- 

 ular and more numerous and ill-defined. In addition to this the 

 whorls are marked by five spiral lines of pits in the intercosaal spaces 

 which extend up on the sides of the ribs but scarcely cross them. 

 These pits are a little narrower than the spaces that separate them. 

 There are also at irregular intervals indications of varices. Aperture 

 moderately large, oval, posterior angle obtuse; outer lip fractured, 

 showing six strong spiral folds within, of which three are anterior 

 and three posterior to the periphery ; columella slightly expanded and 

 reflected over the umbilicus; parietal wall covered by a rather thick 

 callus. 



The type, Cat. No. 362440, U.S.N.M., was collected by Dr. R. H. 

 Tremper, in 6 fathoms, off Dead Mans Island, San Pedro, California, 



