28 PROCEEDINGS OF THE NATIONAL MUSEUM. vou C5 



farther removed from the median pit than from its neighbor, while 

 the second is closely approximated to the second pit. The space 

 between the medium-sized pit and the peripheral pit is crossed by 

 two lines, of which the first divides the space between the two, while 

 the last is separated from the peripheral pit by a mere hair line. 

 Periphery of the last whorl well rounded. Base marked by the 

 feeble continuations of the axial ribs, which evanesce before reach- 

 ing the umbilical chink, and 18 incised spiral lines of varying 

 strength and spacing. Suture moderately constricted. Aperture 

 broadly ovate; posterior angle acute: outer lip tliin ; inner lip con- 

 cave, reflected over and appressed for half its length to the preceding 

 turn, bearing a weak fold a little anterior to its insertion. 



Type.— Cdit. No. 333508, U.S.N.M., has lost the nucleus. The 

 8.75 whorls remaining measure: 6.4 mm.; diameter, 2 mm. The 

 nuclear whorls were described from specimen. Cat. No. 352509 

 U.S.N.M. 



Three additional specimens are in the Oldroyd collection. 



This species belongs to the group of Turbonilla {Pyrgiscus) 

 miricoma Dall and Bartsch and T. (P.) castanea Keep. 



TURBONILLA (MORMULA) EPIPHANEA, new species. 



Plate 1, fig. 12. 



Shell very large. (Nuclear whorls decollated in all the specimens 

 seen.) Postnuclear whorls almost appressed at the summit, well 

 rounded, marked by rather strong, almost vertical axial ribs, of which 

 14 occur upon the first of the remaining turns, 16 upon the second, 

 18 upon the third and fourth, 20 upon the fifth to seventh, 22 upon the 

 eighth to tenth, 24 upon the eleventh, while on the succeeding turns 

 they become enfeebled and finally obsolete. In addition to the axial 

 ribs, low rounded varices, the result of the fusion of several ribs, 

 occur at regular intervals. Intercostal spaces about twice as wide 

 as the ribs, crossed by 8 almost equal, incised spiral lines, which., 

 however, do not enclose equal spaces. The space between the first 

 and second, second and third and sixth and seventh is about twice 

 as wide as the space between the summit and the first, and those 

 between the third and fourth and fourth and fifth, while the space 

 between the fifth and sixth and seventh and eighth stand halfway 

 between these in width. In addition to this, there are very finely 

 incised lines in the spaces between the coarse incised lines. On the 

 last turn, where the axial sculpture becomes obsolete, the spiral 

 sculpture is also very irregular and many more incised lines are 

 apparent. Periphery of the last whorl well rounded. Base short, 

 well rounded, marked by the feeble continuations of the irregular 

 axial ribs, which form mere threads, and in that fashion extend to the 

 umbilical chink, and numerous closely spaced spiral striations. 



