MARYLAND GEOLOGICAL SURVEY 177 



volutions above five, with their shoulder very obtusely grooved; labrum 

 with the edge arcuated ; labium overspread with a calcserous lamina, and 

 with a single oblique fold or small tooth near the base." Say, 1826. 



This small species is very common. It is an exceedingly variable form, 

 the spire at times being very little elevated while other specimens show 

 this feature in a very marked degree. 



The earliest representatives of this species have been found in the 

 Miocene of Jamaica. It also occurs in the Pliocene of Florida, the Pleis- 

 tocene of New Jersey, Maryland, South Carolina, and Florida and in the 

 Eecent ranges from Cape Cod to the Gulf of Mexico. 



Length, 5 mm.; width, 2.3 mm. 



Occurrence. — Talbot Formation. Wailes Bluff near Cornfield Har- 

 bor, St. Mary's County. 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 and TL S. National Museum. 



subclass STREPTONEURA. 

 order CTENOBRANCHIATA. 



Suborder ORTHODONTA. 



Superfamily TOXOGLOSSA. 



Family TEREBRIDAE. 



Genus TEREBRA Adanson. 



Terebra dislocata (Say). 

 Plate XLII, Figs. 7, 8. 



Cerithium disloeatum Say, 1822, Jour. Acad. Nat. Sci. Phila., vol. ii, 1st. 



ser., p. 235. 

 Terebra disloeatum Emmons, 1858, Rept. N. C. Geol. Survey, p. 257. 

 Terebra dislocata Holmes, 1859, Post-PL Fos. S. C, p. 70, pi. xi, fig. 12. 

 Terebra (Acus) dislocata Dall, 1889, Bull, U. S. Nat. Mus., No. 37, p. 94. 

 Terebra (Acus) dislocata Dall, 1890, Trans. Wagner Free Inst. Sci., vol. iii, 



pt. i, p. 24. 



Description. — "Shell attenuated, acute at the apex; volutions with 

 numerous, minute, revolving impressed lines, and from fifteen to eigh- 

 teen transverse, elevated costse to each volution, which are dislocated near 

 13 



