150 



AMERICAN JOURNAL 



S. PYRUM. 



Bulla pyrum, Dilhv. Cat., i. 1817, p. 485. 

 Pyrula spirata, Lam, An. Sans Vert., vii., 1822, p. 142. 

 Fulgur pyruloides, Say, Journ, Ac. N. Sc. Phil., ii. 237. 

 Busycon p)lagosum, Conr. Proc. Ac. N. Sc. Phil., 18G2, p. 

 588. 



Recent. — Gulf of Mexico and East Coast U. S., northward to 

 Cape Hatteras. 



d^ 



S. EXCAVATUS. 



Fulgur excavatus, Conr. Am. Journ. Sc, xxxix., 1840, p. 387, 



(Fossils Tert. U. S., pi. 45, f. 12.) 

 Cassidulus caroUnensis, Tuom. and Holmes, Plioc. Fossils S. 



C, 1855, p. 147, pi. 30, f. 1. 

 Busycon excavatum, Conr. Proc. Ac. N. S. Phil., 1862, p. 



560. 

 Busycon carclinense, Con. lb., p. 560, (not 584.) 



Mioc.—N. Car., (Duplin Co.) 



S. ELONGATUS, Gill, n. S. 

 3Iioe. — N. Car. 



SyCOTYPUS ELONGATUS, Gill. 



Description. — Shell fusi-pyri- 

 form, with seven whorls, the 

 spire much evolved and forming 

 more than a fourth of the total 

 length; with the posterior angle 

 obsolete on the last tsvo whorls, 

 which are consequently convex 

 or rounded ; sutural channel 

 moderate, little deeper than 

 wide, triangular in section, with 

 the external wall inclining regu- 

 larly inwards from the defining 

 angle, and forming an acute 

 angle with the inner wall ; surf- 

 ace with rather broad revolving 

 raised lines, which on the body 

 are faint except on the con- 

 stricted portion, but on the spire 

 are very distinct ; first whorls 

 with the angle moniliform. 



* In this group the channel, instead of being bounded on both sides by 

 vertical walls, slopes regularly inwards from the external bounding ridge. 



