INSTITUTE OF SCIENCE. PHILADELPHIA. 235 



Family BUCCINID/E (supplementary). 



Genus PISANIA. 



Subgenus Celatoconus Conrad. 



Celafoco7ms Cox\ra.A (n. g.), Cat. Mioc. Shells, Proc. Acad. Nat. Sci., Dec, 1862, p. 566. 



(No diagnosis or figure.) Meek, Checklist Inv. Foss. Miocene, p. 17, No. 570, 1864. 

 Caelaioconus Conrad, Am. Jour. Conch, iii. p. 267, 1S68. (No diagnosis.) 



Type Celatoconus protractus Conrad. 



Bucciniim protractum Conr., Proc. Acad. Nat. Sci. Phila. i. p. 30S, Oct., 1S43. (Calvert 



Cliffs, Md. Unfigured.) 

 Celatoco7ms protractus Conrad and Meek, op. cit. supra. 

 Caelatoconus protractus Conr., Am. Jour. Conch, iii. p. 267, pi. 20, fig. 6, 1868. 



The genus Celatocomis was never described by Conrad, who listed it as a 

 genus in the family ConidcB, and a quarter of a century later published a fig- 

 ure of the type specimen, which is a fraginent comprising the last whorl of a 

 shell without the spire. This fragment is 33 mm. long. An examination of 

 it satisfied me that it belonged to a shell closely related to Pisania, and the 

 reception of specimens of another species of the same group from North 

 Carolina enables me to constitute the group. It is hardly more distinct from 

 Pisania proper than is Triionidea, and in some respects is intermediate be- 

 tween them. Celatocotms, like Metida, differs from all the Pisanias in want-- 

 ing the subsutural callus and contracted notch of the posterior commissure 

 of the aperture; in its thinner shell, larger nucleus, and thin and smooth cal- 

 lus on the body and pillar. All the other characters of the shell may be ob- 

 served in Pisania or Tritonidea. The type belongs to the Chesapeake Mio- 

 cene of Maryland. 



This group differs from Lcnzdhiccimini (^prorsnm Conr.) by being some- 

 what stouter, with a less flexuous outer lip, and in having cancellated instead 

 of only spiral striation. Both are separated from Pisania proper chiefly by 

 the absence of the subsutural callus. This can hardly be regarded as of 

 generic significance. From the point of view of descent it looks as \{ Lcsvi- 

 buccinuvi led the way, was succeeded by Cedatocomts, which in turn gave way 

 to Pisania proper. The relations of Metida with Celatoconus stand in need 

 of investigation. 



Pisania (Celatoconus) nux n. s. 

 Plate 13, figure 6. 

 Miocene of the Cape Fear River, Johnson ; one fragment from Mrs. Guion's 

 marl-bed, another from Purdy's; also at Natural Well, Duplin Co., Burns. 



Shell small, not heavy, subfusiform, with a rather short, pointed spire 

 and about seven whorls ; nucleus of two and a quarter smooth whorls, apex 

 moderately pointed, whorls rapidly enlarging beyond it ; spiral sculpture of 

 about five revolving, strap-like elevated bands on the earlier whorls, with 

 wider interspaces, especially that next the suture ; later whorls show an 



