NO. 2193. WEST AMERICAN MARINE MOLLUSKS—BARTSCH. 645 



This species is quite unlike any of the other Imown west American 

 forms. It recalls somewhat Turbonilla {Stnoturhonilla) panumen^sis 

 C. B. Adams, from Panama, in the very regular and oblique disposi- 

 tion of its axial ribs. 



TURBONILLA (PYRGOLAMPROS) HANNIBALI. new species. 



Plate 43. fig. 7. 



Shell elongate conic, yellowish white. Nuclear whorls decollated, 

 Postnuclear whorls almost flattened, narrowly shouldered at the 

 summit, marked by ill-defined indications of axial ribs, which are 

 entirely too poorly developed to permit counting. The spiral sculp- 

 ture consists of slender, closel}^ spaced striations. Sutures strongly 

 impressed. Periphery of the last whorl obtusely angulated. Base 

 moderately long, well rounded, marked like the spire. Aperture 

 broadly oval; posterior angle acute; inner lip almost vertical, some- 

 what sinuous, and slightly reflected. 



The type and two additional specimens. Cat. No. 252428, U.S.N.M., 

 were collected by Mr. Harold Hannibal in the Upper Pliocene " Elk 

 Eiver beds," at the mouth of Elk River at Port Orford, Oregon. 

 The type has nine postnuclear whorls and measures — length, 9 mm.; 

 diameter, 2.5 mm. 



The present species recalls Turhonilla {Pyrgolampros) oregonen- 

 ds Bartsch, but is larger in every way than that species and has the 

 summit of the whorls appressed, not tabulated ; the spiral sculpture 

 also is much more strongly developed. Turhonilla {Pyrgolampros) 

 hannibali differs from Turhonilla {Pyrgolampros) lituyana Dall and 

 Bartsch in being smaller and in having the ribs much less strongly 

 indicated than in that species. 



TURHONILLA (PYRGOLAMPROS) FRANCISCANA. new species. 

 Plate 42, fig. 2. 



Shell elongate conic, flesh colored, excepting a broad chestnut 

 band which covers the median third of the last whorl. This dark 

 band really consists of two chestnut-colored zones, the anterior of 

 which embraces half of the band while the posterior is equal to 

 one-fourth of the width of the dark area, the two being separated 

 by a zone of a little lighter shade which is as wide as the posterior 

 zone. Nuclear whorls decollated in all the specimens seen. Post- 

 nuclear whorl rather high between the sutures, feebly shouldered at 

 the summit, and slightly constricted at the periphery. Early post- 

 nuclear whorls marked by low, rounded, broad, almost vertical axial 

 ribs which are wider than the shallow impressed spaces that separate 

 them. On the later whorls the axial ribs become quite obsolete. On 

 the first of the postnuclear whorls there are eighteen of these ribs; 



