384 PROCEEDINGS OF THE ACADEMY OF [PaRT II 



ing to Tryon). As the exact identity of Adams's species appears 

 to be in doubt, and the correspondence with Gabb 's shell is not ab- 

 solutely exact, we leave open the question of possible identity with 

 a recent species. 



Rissoina bryerea (Mont.), variety? Plate XXXIV, fig. 2. 



Biltium costatmn Gabb, Tr. Am. Philos. Soc. xv, 1873, p. 239. 



The type of B. costatum is an immature shell, lacking a half whorl 

 perhaps, 3.65 mm. long. It agrees with R. bryerea (Mont.) except 

 that there are more ribs, which are therefore somewhat smaller, 

 but not so small as in R. minuta (Gabb), or R. multicostata (C. B. 

 Ad.) The name used by Gabb had already been given to anoth- 

 er species by C. B. Adams. If distinct from bryerea it may be call- 

 ed var. binominis. 



The type is no. 2819 A. N. S. P. 



Rissoa epulata Pils. and Johns. Plate XXXIV, fig. 5. 



Proc. A. N. S. Phila., 1917, p. 172. 

 Rissoa (Alvania) proavita Pils. and Johns. Plate XXXIV. fls. 6. 



Proc. A. N. S. Phila., 1917, p. 173. 



CAPULIDAE. 



Capulus inornatus Gabb. Plate XXX, figs. 11, 12. 



Capulus inornatus Gabb, Tr. Am. Philos. Soc, xv, 1873, p. 242. 



The embryonic shell has 1| whorls, the spire in a plane. It is 

 very close to the columellar margin of the last whorl. The last 

 whorl shows faint, fine and close radial sculpture in some places. 

 The columellar margin is coarsely crenulated, probably due to the 

 supporting object. 



Length, from umbo to opposite margin 14, width 13, convexity 

 7 mm. 



The holotype is no. 2829 A. N. S. P. 



HIPPONICIDAE. 



Hipponix pilosa Desh. 



Scurria milra Esch., Gabb, Tr. Am. Philos. Soc, xv, p. 24.5. 



Two somewhat worn examples agree well with this common West 

 Coast species of the recent fauna. We can find no significant dif- 

 ferences except those of time and space. 



Hipponyx otiosa Pils. and Johns. Plate XXX, figs. 19, 20. 



Proc. A. N. S. Phila., 1917, p. 173. 



