233 SYSTEMATIC PALEONTOLOGY 



Genus EULIMELLA Forbes. 



Subgenus ANISOCYCLA Monterosato. 



EULIMELLA (AnISOCYCLA) JIARYLANDICA H. Sp. 



Plate LIV, Figs. 9, 9a. 



Description. — Shell small, elongate, ten-whorled ; whorls slightly con- 

 vex; sutures distinct; surface highly polished; longitudinal ribs absent; 

 sculpture consisting of about twelve sharp incised revolving grooves at 

 somewhat variable intervals. 



This species resembles the English species Eiilimella nitidissiuia, which 

 is the type of Anisocycla, but is much larger. 



Length, 7 mm. ; diameter, 3 mm. 



Occurrence. — St. Mary's Formation. St. Mary's Eiver. 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 Wag-ner Free Institute of Science, Cornell University. 



Genus TURBONILLA Risso. 

 Subgenus CHEMNITZIA d'Orbigny. 



TuKBONiLLA (Chemnitzia) nivea Stimpson. 

 Plate LIV, Fig. 10. 



'? Tiirritella lagueaia Conrad, I80O, Jour. Acad. Nat. Sci. Phila., vol. vi, 1st ser., 

 p. 221, pi. ix, fig. 17. 



? Pasithea exarata H. C. Lea, 1848, New Fossil Shells from the Tertiary, of Vir- 

 ginia, Abst. p. 6. 



? Pasitfiea exarata H. C. Lea, 1S-J5, Trans. Amer. Philos. Soc, vol. ix, p. 351, pi. 

 XXXV, fig. 44. 



Chemnitzia nivea Stimpson, 1851, Proc. Boston Soc. Nat. Hist., vol. iv, p. 114. 



Turbonilla nivea Holmes, 18.59, Post-Pleiocene Fossils of South Carolina, p. 83, 

 pi. xiii, figs. 3, 3a, 3b. 



Turbonilla nivea Dall, 1892, Trans. Wagner Free Inst. Sci., vol. iii, pt. ii, p. 355. 



Description. — " Shell aciculate, sub-cylindrical, white, shining ; whorls 

 eleven, flattened, longitudinally plicate; folds straight, interstices per- 

 fectly smooth." Stimpson, 1851. 



It is possible, and perhaps even probable that this species was descril^ed 

 by Conrad, in 1830, under the name of Turritella laqueata. Conrad's 

 type is not in existence and the description and figure are not sufficient 

 to identify the species with aljsolute certainty. There does not seem to 



