26 BULLETIN 68, UNITED STATES NATIONAL MUSEUM. 



Three specimens of this species, all with decollated apex, are in the 

 collection of the U. S. National Museum (Cat. no. 59321). They 

 were collected at Acapulco, Mexico. The one fio^ured is the largest 

 fragment. It has eight wdiorls, (if complete it would prohablj have 

 fourteen) and measures: Length 11.5 mm., diameter 4.6 mm. The 

 Dunker collection of the K. K. Zoological Museum of Berlin contains 

 two specimens of this species. 



PYRAMIDELLA (PHARCIDELLA) PANAMENSIS, new species. 



Plate 1, fig. 8, 8". 



Shell slender, elongate-conic, horn-yellow, excepting the last whorl 

 which is suffused with, pale rose-purple. Nuclear whorls small, two 

 and one-half, forming a depressed helicoid spire, whose axis is at 

 rio-ht angles to that of the succeeding turns, in the first of which it is a 

 little more than half immersed. Post-nuclear whorls flattened, flatly 

 shouldered at the summit, which is crenulated and decidedly chan- 

 neled at the periphery, marked on the posterior half )\y feeble riblets 

 which disappear before reaching the middle of the whorl. Sutures 

 strongly channeled. Periphery of the last whorl with a deep sulcus, 

 which is crossed by numerous very slender and closely spaced axial 

 riblets. Base well rounded, with a strong fasciole about the colu- 

 mella. Aperture oval; posterior angle acute, slightly channeled 

 anteriorly; outer lip thin; columella slender, revolute, provided with 

 a lamellar posterior fold at the insertion of the columella, and two 

 equally slender, very oblique ones anterior to it. 



The type and another specimen (Cat. no. 122792, U.S.N.M.) were 

 dredged at U. S. Bureau of Fisheries station 2805, in 51 fathoms, mud 

 bottom, in Panama Bay. It has twelve post-nuclear whorls and 

 measures: Length 8.S mm., diameter 3 mm. 



PYRAMIDELLA (PHARCIDELLA) MOFFATI Dall and Bartsch. 



Plate 1, fig. 11. 



Obeliscus clavulus A. Adams, Sowerby Thes., 1854, p. 811, pi. 171, fig. 33, not 

 Obeliscus clavulus (Ferussac) Beck, Index Moll., 1838, p. 62. =PyramiMla 

 (Pharddella) moffati Dall and Bartsch, Proc. V. S. Nat. Mus., vol. 30, 

 1906, p. 323. 



Shell moderately large, strong, early part of the spire broadly conic, 

 later subcylindric, white, marked diversely with various shades of rust 

 brown. (Nuclear whorls decollated.) Post-nuclear whorls moder- 

 ately rounded, scarcely at all contracted at the periphery, narrowly 

 shouldered at the summit, which is finely crenulated, marked by many 

 lines of growth, some of which are a little stronger than the rest, the 

 stronger corresponding to the crenulations at the summit and lend 

 the surface the appearance of being obsoletely ribbed. Periphery of 

 the whorls marked by a slender well-impressed spiral channel, which is 



