1899.] NATURAL SCIENCES OF PHILADELPHIA. 175 



T. viridaria Dall — wh. 16, with bluut, sinistral nucleus ; ribs about 

 25; spirals = 5 coarse and a few fine lines. 11 X 2.25 mm. 



T. elegans YerriW, 1874 (?) variety (?)— not Ch. elegam d'Orb., 

 1853, nor 0. elegans A. Ad., 1860, nor Monterosato, 1869— 

 wh. 8 + nucleus wanting; ribs 22; spirals = 5 coarse and 2 fine 

 Hnes. 6 X 1| mm. 



T. sp. (young) — wh. 6 + nucleus wanting; ribs about 24; spirals 

 = 6 coarse and 2 fine lines. 3^ X li mm. 



T. sp. (young) — wh. 6 + nucleus wanting; ribs about 20; spirals 

 = 6 coarse and several fine lines. 4f X 1^ mm. 



C. SPIRALS FINE, EQUAL OR NEARLY SO. 



T. exilis C. B. Adams, 1850— not 0. exilis Garrett, 1873 — wh. 



10 + the transverse, nearly flattened nucleus; ribs 15-18; 



spirals numerous, not on base. .165 X .037 inch. 



C. — Transverse ribs reaching below periphery of body-whorl. 

 Spirals = incised lines and raised, rounded threads. 

 T. textllis Kurtz (?) — wh. 6 + the oblique, flattened nucleus; ribs 



20-26; spirals = wide, deep grooves on whorls, and raised, 



rounded threads on base. 3i X li- mm, 

 T. fasciata d'Orbigny, 1847 (?) — not Carpenter, 1857, nor 0. 



fasciata Dunker, 1860, nor Tenison- Woods, 1875 — wh. 9 + 



nucleus (?); ribs about 20; spirals = strise on whorls and raised 



threads on base. 24 X li mm. 



D. — Transverse ribs extending over base. Peritreme not con- 

 tinuous. 

 T. fiavocinda C. B. Adams — 8-9 + the very obUque nucleus; ribs 



28; spirals = exceedingly minute lines, coarser and traversing 



the ribs anteriorly. .145 X .04 inch. 

 T ornata d'Orbigny,* 1853— not Gould, 1861— wh. 10, with tilted 



nucleus ; ribs about 24 ; spirals fine on all intercostal spaces. 



6X1 mm. 

 T. Stimpsoni Bnsh — wh. 9 + the slightly oblique, flattened nucleus; 



ribs about 36 ; spirals = several on all intercostal spaces. 5f X 1 



mm. 



D'. — Transverse ribs extending over base. Peritreme continuous. 



* (I'Orbigny's types were presented to the British Museum. 



