1921] NATURAL SCIENCES OF PHILADELPHIA. 399 



We think that the suture might become curved or tangential with 

 further groAvth. 



Teinostoma vitreum (Gabb^ Plate XXXVII. flgs. 3, 3a, 36. 



Utnbonmni vitreum Gabb, Tr. Amer. Philos. Soc, xv, 1873. p. 243. 



Parkeria vitrea Gabb, Journ. Acad. Nat. Sci. Phlla. viii, p. 368, pi. 47, fig. 69. 



This is an Umbo7iiuni-like shell of 3f whorls. Faint, close spiral 

 striae may be seen on the upper part of the last whorl under strong 

 magnification. The basal callus is like that of Helicina, its outer 

 edge rather indistinct. There is a thick parietal callus somewhat 

 exaggerated in Gabb's figure. 



Alt. 1.1, diam. 1.85 mm. 



Type no. 2833 A. N. S. P. 



This species belongs to the subgenus Pseudorotella. It is type 

 of Parkeria Gabb, not Parkeria Carpenter & Brady, 1869 (Protozoa). 



FISSURELLIDAE. 



Diadora alternata henekeni Maury. 



Lucapina alternata Say, Gabb, Trans. Amer. Philos. Soc, xv, 1873, p. 244. 

 Fissuridea henekeni Maury, Bull. Ainer. Pal. V, p. 157. 



The four specimens, no. 3163, differ somewhat from recent F. 

 alternata; the concentric cords are closer, rising into higher scales 

 on the radial ribs, and the orifice is relatively a little longer, one- 

 sixth the total length. 



SCAPHOPODA. 



As the Scaphopoda have been already described and illustrated 

 in a special paper, it is not necessary to repeat the matter here. 



Dentalium rudis Gabb, Trans. Amer. Philos. Soc, xv, p. 244, ap- 

 pears to be a worm tube. It has been figured in Proc. A. N. S. 

 Phila., 1897, p. 471, pi. 10, figs. 4, 8. 



DENTALIIDAE. 



Dentalium cossmannianum Pilsbry and Sharp. 



Dentalium cossmannianum Pilsbry & Sharp, Proc. A. N. S. Phila. 1897, p. 

 467, pi. 10, fig. 11; pi. 11, figs. 10, 11. 



Type no. 2709 A. N. S. P. 



Dentalium callioglyptum Pilsbry and Sharp. 



Dentalium callioglyptum P. and S., Proc. A. N. S. Phila., 1897, p. 468, pi. 10, 

 figs. 11, 12; pi. 11, fig. 21. 



Type no. 2713 A. N. S. P. 



Dentalium tryoni Pilsbry and Sharp. 



Dentalium tryoni P. and S., Proc. A. N. S. Phila., 1897, p. 468, pi. 10, figs. 5, 

 9; pi. 11, fig. 22. 



Type no. 2710 A. N. S. P. 



