296 PROCEEDINGS OF THE ACADEMY OF [Sept.,. 



which he questionably referred to the genus Siomatia. This form, 

 Stoynaiia ohstricta White,^^ although it is represented by a cast, pre- 

 sents an outline together with a spiral ornamentation and an indica- 

 tion of an umbilical chink which suggest the genus Paramorea.^ 

 Until more perfect specimens of the California species are known its 

 generic position will probably remain uncertain. 

 Paramorea lirata n. sp. PI. XVII, figs. 9, 10. 



Description. — Shell small and porcellanous, ovate-conic in outline;, 

 spire acute, its elevation a little less than the length of the aperture; 

 whorls closely appressed and shouldered; increasing in size with a 

 fair degree of rapidity; protoconch scar small; sculpture sharply 

 spiral, consisting of six well defined lirse on the penult and thirteen 

 on the ultima, lirae strongest and most widely spaced on the posterior 

 edge of the whorls, on the anterior portion of the body the spiral 

 threads are closely spaced, the interspaces being narrower than the 

 lirae, lirae intersected and slightly interrupted by incremental lines; 

 suture distinct; body abruptly constricted posteriorly, forming a 

 narrow shoulder, body convex medially and well rounded in front; 

 aperture ovate, deeply notched anteriorly; outer lip evenly rounded,, 

 very slightly crenulated along the margin, subangular and a little 

 thickened at the entrance of the anterior canal; inner lip excavated, 

 parietal wall washed with a thin callus; columella slender, marked 

 by a very feeble and oblique fold or twist of the pillar near the 

 anterior extremity; umbilical chink very narrow and oblique, the 

 last of the body spirals abnormal and constituting an obtuse umbilical 

 keel; anterior canal short and open. 



Dimensions. — Altitude 7.3 mm.; maximum diameter 4.7 mm. 



Only two individuals of this elegant little species, which is the 

 type of the genus, are known. They are well characterized by their 

 spiral ornamentation, deeply notched aperture and further by the 

 very oblique and narrow umbilical chink. The shell material is 

 porcellanous and hard. One of the specimens has a brownish axial 

 banding fixed in the shell material which seems to be a remnant of 

 an ancient color pattern. 



Family CERITHID^. 



Genus NUDIVAGUS n. gen. 



Etymology: Nudus, unadorned; vagus, a straggler. 

 Type: Nudivagus simplicus n. sp. 



31 White, C. A., 1889, Bull. U. S. Geol. Survey, No. 51, p. 18, PI. IV, figs. 10, 11 



