1921] NATURA.L SCIENCES OF PHILADELPHIA, 385 



CALYPTRAEIDAE. 



Crepidula plana Say. 



Crypta fornicata Linn., Gabb, Tr. Am. Philos. Soc, xv, 1873, p. 242. 



There can be no doubt of the identity of the single specimen. 



Crucibulum auricula (Gmel.) 



Crucibulum spinosiim Sby., in part, Gabb, Tr. Am. Philos, Soc, xv, p. 241. 

 Crucibulum auricula Gmel., Dall, Tr. Wagn. Free Inst. Sci., iii, p. 349. 



A large specimen, length 25, alt. 11.7 mm., is seated on the spire 



of a Conus. Another 26 mm. long became smooth after attaining 



a length of 9 mm. 



Crucibulum auricula spinosum Sowerby. 



Crucibulum spinosum Sby., in part, Gabb, I. c. 



Two rather small examples. 



Crucibulium striatum (Say) 



A single small specimen, 5.4 mm. long, is identified with some 

 doubt. The cup is more angular anteriorly than in recent shells. Ex- 

 terior smooth. 



Calyptraea centralis (Conrad) 



Trochitd sp. undet., Gabb, Tr. Am. Philos. Soc, xv, p. 242. 



The single small specimen agrees with recent shells from St. 

 Thomas, identified as C. candeana Orb., a name which Dall con- 

 siders a synonym of centralis (Trans. Wagn. Inst., iii, 353). 



XENOPHORIDAE. 



Xenophora dilecta (Guppy) Plate XXXII, flgs. 7, 8. 



Phorus agglutinans Lam., Gabb, Tr. Am. Philos. Soc, xv, 1873, p. 241. 

 Phorus dilectus Guppy, Q. J. Geol. Soc, xxxii, 1876, p. 529, pi. 28, fig. 10. 



This form was described and figured by Mr. Guppy from a young 

 specimen. The shell is far less profusely loaded with shells and 

 other objects than the recent X. co7ichyliophora, and shows a much 

 greater part of the proper surface, which is copiously sculptured 

 with fine protractive wrinkles. Base as in X. conchyliophora ex- 

 cept that the umbilical chink is larger. The parietal wall is honey 

 yellow. Largest example has a diameter of 68 mm. 



This Xenophora may perhaps be a local race of X. conchyliophora, 

 but its characters indicate at least subspecific distinction. 



Xenophora imperforata (Gabb) Plate XXXI, flgs. 3, 4. 



Onustus imperforatus Gabb, Tr. Am. Philos. Soc, xv, 1873, p. 241. 



The upper surface has the usual sculpture of fine, crowded, pro- 

 tractive wrinkles, which are not granulous. The last 3| whorls 



