176 SYSTEMATIC PALEONTOLOGY 



recent state, as may be seen under the habitas, has an enormous range. 

 I have felt myself unwillingly compelled to admit that it ranges from 

 the Arctic Eegions in 74° 48' N. to the Mediterranean, the West Indies, 

 and Cape of Good Hope." Darwin, 1854. 



Fragments of this species are common at Federalsburg. The compart- 

 ments, with their alse more or less broken, are the only portions of the 

 shell that have been observed here. Smaller shells occur at Wailes Bluff 

 where one specimen with its compartment and basis intact was found. 

 The operculum has not been obtained with any of the material. 



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

 bor, St. Mary's County; Federalsburg, Caroline County. 



Collections. — Maryland Geological Survey, Johns Hopkins University. 



MOLLUSCA. 



Class GASTROPODA. 



subclass EUTHYNEURA 



order OPISTHOBRANCHIATA. 

 Suborder TECTOBRANCHIATA. 



Family TORNATINIDAE. 



Genus TORNATINA A. Adams. 

 TORNATINA CANALICULATA (Say). 



Plate XLII, Figs. 5, 6. 



Volvaria canaliculata Say, 1826, Jour. Acad. Nat. Sci. Phila., vol. v, 1st ser., 



p. 211. 

 Volvaria canaliculata Holmes, 1859, Post-Pi. Fos. of S. C, pp. 78, 79, pi. 



xii, figs. 11, 11a. 

 Tornatina canaliculata Dall, 1889, Bull. U. S. Nat. Museum No. 37, p. 84, pi. 



lii, fig. 27. 

 Tornatina canaliculata Dall, 1890, Trans. Wagner Free Inst. Sci., vol. iii, pt. 



1. p. 15. 



Description. — " Shell whitish, immaculate, cylindric, with very minute 

 obsolete wrinkles; spire convex, very little elevated, mammilated at tip; 



