60 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 56. 



This little shell is very abundant in the siftings from the mud at 

 the above localities. 



PHILBERTIA (NANNODIELLA) FRATERNALIS, new species, 



Plate 20, fig. 5. 



Shell similar in size and general aspect to the preceding and best 

 described by a comparative diagnosis. The nucleus is shorter and 

 less acute; the peripheral keel is less prominent and more or less 

 nodulous at intersections with axial sculpture; there is a space be- 

 tween the second keel and the succeeding suture, both the interspaces 

 are strongly latticed; the anal fasciole is conspicuously spirally 

 threaded ; the axial sculpture of narrow riblets with wider interspaces 

 extends forward from the peripheral carina which it nodulates and 

 on the last whorl reaches more or less distinctly over the base ; there 

 are three instead of two keels near the periphery on the last whorl. 

 Height, 4.75 ; height of last whorl, 2.5 ; diameter, 1.75 mm. Cat. No. 

 271401, U.S.N.M. 



Range. — Near Cape San Lucas, Lower California, at Station 2822, 

 in 21 fathoms, sandy bottom. U. S. Bureau of Fisheries steamer 

 A Ihatross. 



This would have been regarded as a variety of Tiana had it not 

 been for the constant difference in the nuclear whorls. The sharp 

 angular outlines of nana give it a character very different from the 

 present form at first sight. It is comparatively rare. 



PHILBERTIA (NANNODIELLA) PHYLIRA, new species. 



Plate 20, fig. 6. 



Shell small, slender, thin, waxen white, with a narrow purple- 

 brown band in front of the suture in the later whorls, the pillar and 

 canal more or less similarly tinted ; nucleus very small, rather blunt, 

 with the latter part spirally threaded, of about one and a half whorls, 

 followed by about six subsequent whorls; spiral sculpture of (on the 

 early whorls one, later two, and on the last whorl three) strong, 

 rather widely separated threads which are prominently nodulous 

 where they cross the ribs and on the spire are feeble in the inter- 

 spaces; suture appressed, obscure, the anal fasciole inconspicuous be- 

 hind the first row of nodules ; on the base are 3 or 4 distant threads 

 and on the canal a few feeble spirals; axial sculpture (on the last 

 whorl of about 15) narrow sharp nearly vertical ribs with wider in- 

 terspaces, the general surface between them with more or less prom- 

 inent incremental sculpture; aperture narrow, anal sulcus feeble, 

 outer lip thin, smooth inside, inner lip smooth, canal distinct, short, 

 straight. Height of shell, 7; of last whorl, 4.25; diameter, 2 mm. 

 Cat. No. 274108, U.S.N.M. 



Range. — Panama, in beach drift, James Zetek. 



