1921] NATURAL SCIENCES OF PHILADELPHIA. 337 



Olivella nivea (Gmelin). 



One specimen is reforal)le to this recent species. 

 OliveJla rosalina (Duclos). 



Two specimens having entirely the form of this recent species. 



HARPIDAE. 



Harpa americana n. sp. Plate XXIII, fig. 13. 



H. rosea Lam., Gabb, Tr. Am. Philos. Soc. xv, p. 214. 



The shell is ovate, of about 6 whorls, of which three smooth ones 

 form the nipple-shaped embryonic shell, the last whorl of which, 

 together with part of the first sculptured whorl, are very narrow. 

 The last whorl has about eleven low and narrow axial ribs w^hich 

 rise into small spines where they pass over the angle bounding a 

 narrow flattening below the suture. The whole surface below this 

 angle is spirally striate, the striation strongest in the concavity of 

 the sides below. The aperture is narrow for this genus. A thin 

 callus spreads forward over the ventral convexity. 



Length 33.3, diam. 28.6 mm. 



This form is very similar to the recent Harpa rosea Lam. (H. 

 doris Bolt.), but specimens of that species of the same size have 

 more ribs and a wider aperture. 



Type no. 4061 A. N. S. P. 



MARGINELLIDAE. 



Marginella sowerbyi Gabb. Plate XXIII, jBg. 14. 



Marginella sowerbyi Gabb, Tr. Am. Philos. Soc. x\, 1873, p. 221. 



A markedly biconic species. The second and third columellar 

 plaits have flattened and slightly furrowed summits, the fourth 

 being flattened. 



Length 14.5, diam. 8.1, length of aperture 10.5 mm. 



A much smaller example, length 8.2 mm., with the type, shows 

 traces of coloration. There are 5 spiral zones, the upper, middle 

 and lower vertically lineolate with white, the other two having spot- 

 ted borders and uniform median bands. 



Type no. 2498 A. N. S. P. 



Marginella nugax Pils. and Johns. Plate XXIV, fig. 14. 



Proc. A. N. S. Phila., 1917, p. 165. 



Marginalia coniformis Soweiby. 



Marginella coniformis Sowb., Q. J. Geol. Soc. vi, 1849, p. 4,5. Guppv, I. c. 

 xxii, 1866, p. 288, pi. 17, fig. 2. Dall, Proc. U. S. Nat. Mus. xix, 1896, p. 

 309. 



