A1;N()I,1) TllK PAI.F.ONTOLOOY AND STRATIfiliAPIIV OK SAN PEDRO. 207 



176. Drillia merriami, sp. nov. 



Platk VIII, Fu;. 7. 



Shell small, fusiform, rather thin; apex bUiiit; whorls seven, somewhat angular, with about 

 fourteen slitrjitly oblique, prominent, rather sharp transverse ridges; these ridges are most prominent 

 on angle of whorl, and become obsolete near anterior margin and at about one-third width of whorl 

 Irom [)Osterior margin; a narrow sutural band occupies upper one third of whorl; incremental lines 

 \isil)le; suture deeply im|)ressecl, distinct; body-whorl somewhat ventricose and narrowed anteriorly, 

 with transverse ribs sometimes obsolete; aperture broadly elliptical, narrowed anteriorly to a promi- 

 iKiit sinus; posterior sinus small, near suture; outer lip arcuate, thin; columella smooth. 



Dimensions. — Long. 14.2 mm.; lat. 5.2 mm.; body-whorl 7.6 mm.; aperture, including 

 canal, 6 mm.; canal 1.5 mm.; defl. 31 degrees. 



Tlii.s species somewhat resembles Borsonia barischi, but may be distinguished 

 \)\ lack of columellar plait, longer but less oblique transverse ridges, and narrower 

 sutural band. Distinguishable from D. liempliiUi. by lack of spiral sulcations, less 

 obliijue ribs, much longer body-whorl, and much more prominent canal. Di.s- 

 tingiiishable from I>. torosa by lack of spiral lines, narrower sutural I^and, le.ss convex 

 wIkjtIs, and more and longer ribs. This species is .said by Dr. Dall to be near the 

 Panama species D. pallida Sby. Named in honor of Dr. John C. Merriam, Pro- 

 lessor of Paleontology in the University of California, who has assisted the writer in 

 many ways in the preparation of this paper. 



Rare in Pliocene and lower San Pedro sci"ies of Deadman Island. The 

 specimen figured is the type, which is from the lower San Pedro series at Deadman 

 lsl;ui(], and is now in the United States National ^luseum. 



Pleistocene. — San Pedro (Arnold). 



Pliocene. — San Pedro (Arnold). 



177. Drillia montereyensis Stearns. 



Pleiuutoma (Drillia) ??!oniereyensis Stearns, Proc. Cal. Acad. Sci., Vol. V, 1873, p. So, PI. I, 

 fig. 21. Tkyon, Man. Conch., Vol. VI, p. 184, PI. XII, fig. 30, 1884. 



Shell small, elongate, slender; seven moderately rounded whorls, upper portion of volutions 

 concavely aiigulated and ornamented with fine spiral ribs and furrows; middle of upper whorls and 

 upper part of body-whorl dis])laying fifteen equidistant, longitudinal, nodose, slightly oblique ribs; 

 on the smaller volutions of the spire a puckering at and following the suture suggests a second 

 indistinct series ol nodules; aperture less than half the length of shell; canal short; posterior sinus 

 r.ither broad, rounded and of moderate depth. 



Dimensions. — Long. 15 mm.; lat. 6 mm.; body-whorl S.4 mm.; a[)ertiire 6 mm.; defl. 

 22 degrees. 



Resembles a large D. liempliilli in shape, l)iit has a very distinctive orna- 

 mentation. 



Rare in tlic; lower San Pedro series at Deadman Island; of tiie two specimens 

 fiiiiiid, one was obtained by Mrs. Oldroyd. 



Living. — Monterey (Stearns) . 



Pleistocene. — San Pedro (Oldroyd: .VinoM). 



