INSTITUTE OF SCIENCE, PHILADELPHIA. 229 



lina are fully as large as M. lineolata Heilprin, from which they are hardly to 

 be distinguished. The young of the two forms differ much more than the 

 adults, and it cannot be doubted that the lineolata is the Pliocene descendant 

 of the species in question. 



Mitra Millingtoni Conrad. 

 Part i. p. 94. 

 This species was described, with most of the other forms figured in 

 Wailes's Geological Report of Mississippi, in the Proceedings of the Academy 

 of Natural Sciences, Philadelphia, page 261, vol. vii. for 1855. 



Family TURBINELLID^E (supplementary). 



Genus TURBINBLLA Lamarck. 



Turbinella scolymoides Dall. 



Part i. p. 98, pi. 3, figs. 2, 5, 1890. 



A number of specimeais of this species were obtained at Shell Creek by 



Mr. Willcox, which appear to diminish the gap between it and T. scolymus. 



It is possible that the Pliocene form may eventually rank no higher than a 



sub-species. 



Family FASCIOLARIID^ (supplementary). 



Genus FASCIOLARIA Lamarck. 



Pasciolaria (Sparrowi var. ?) acuta Emmons. 



Plate 13, figure 2. 



F. Sparrowi Emmons, N. C. Geol. Surv. Rep., p. 253, fig. 115, 1858. 

 F. acuta Emmons, N. C. GeoL Surv. Rep., p. 254, fig. 117, 1858. 



F. subtenta Conrad, Proc. Acad. Nat. Sci., 1S64, p. 211 ; Am. Journ. Conch, vi. p. 314, pi. 

 13. fig- 3 (broad variety). 



Miocene of Duplin Co., N. C, at the Natural Well and vicinity, Willcox; 

 and Cape Fear River, Emmons. 



Shell large, solid, eight- whorled ; nucleus small, at first smooth, later 

 transversely ribbed with small arched riblets ; whorls somewhat compressed 

 behind the periphery, suture distinct, deep on the later whorls ; transverse 

 sculpture of eight or nine wave-like peripheral ribs which are variable in 

 strength, sometimes obsolete and absent from the terminal whorl ; also of 

 fine impressed, wavy lines, covering the whole surface and sometimes regu- 

 larly spaced so as to crenulate the minuter spirals ; as the shell grows old it 

 has at the last a tendency to resting stages or varicosity of the outer lip, 

 which in some specimens gives the effect of obscure varices or irregular, 

 wavy, narrow ribs on the periphery of the last half of the last whorl, but 

 these may be wholly absent; spiral sculpture of fine striae covering the whole 

 surface, and of strong carinated ridges more or less alternated in size on the 

 earlier and nearly uniform on the later whorls; canal long, wide, quite 



