MARYLAND GEOLOGICAL SURVEY 183 



" A single specimen only was found, which appears to be a mature 

 shell, and is most nearly allied to B. canaliculatum. The spire is more 

 elevated than in that species, and differs also in being without tuber- 

 cles." Conrad, 1862. 



This species has been found at the St. Mary's Kiver by no one else 

 and so the occurrence is considered doubtful. 



Genus LIROSOMA Conrad. 



LiROSOMA suLCOSA Conrad. 

 Plate XLVII, Fig. 1. 



Pyrula nulcosa Conrad, 1830, Jour. Acad. Nat. Sci. Phila., voL vi, 1st ser., p. 330, 



pL ix, tig. 8. 

 Fums sulcosus Conrad, 1833, Fossil Shells of the Tertiary No. 1, p. 18, pi. iii, tig. 3. 



(Reprint, 1893, p. 18 (p. 32).) 

 Fusus sulcosus Conrad, 1843, Proc. Nat. Inst., Bull, ii, p. 187. 

 Fasciolaria sulcosa Conrad, 1861, Fossils of the Medial Tertiary, No. 4, p. 86, pi. 



xlix, flg. 7. 

 Fasciolaria (Lirosoma) sulcosa Conrad, 1863, Proc. Acad. Nat. Sci. Phila., vol. xiv, 



p. 286. 

 Fasciolaria (Lyrosoma) sulcosa Conrad, 1863, Proc. Acad. Nat. Sci. Phila., vol. xiv, 



p. 561. 

 Fasciolaria (Lyrosoma) sulcosa Meek, 1864, Miocene Check List, Smith. Misc. Coll. 



(183), p. 31. 

 Lirosoma sulcosa Conrad, 1867, Amer. Jour. Conch., vol. iii, p. 367, pi. xxiii, tig. 3. 

 Lirosoma sulcosa Tryon, 1881, Manual of Conchology, vol. iii, p. .50, pi. xix, fig. 53. 

 Not Fasciolaria (Lyrosoma) sulcosa Whitfield, 1894. 

 Lirosoma sulcosa Cossmann, 1901, Essais de Paleoconch. Comp., vol. iii, p. 79, pi. 



iv, fig. 4. 



Description. — " Shell pyrif orm ; ventricose ; transversely ribbed, and 

 longitudinally sulcated; summit of the whorls flattened, and subcanali- 

 culate; right lip striated within; channel much contracted; beak straight 

 or slightly recurved at the base." Conrad, 1830. 



"Pyriform, body whorl rounded; spire short; summit of the volutions 

 flattened, subcanaliculate ; ribs prominent, revolving, crossed by longi- 

 tudinal curved lines; labrum striated within; beak straight or slightly 

 recurved at the base; channel much contracted; columella with a fold at 

 base." Conrad, 1861. 



Length, 25 mm.; diameter, 15 mm. 



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



Collections. — Maryland Geological Survey, Philadelphia Academy of 

 iSTatural Sciences, U. S. National Museum, Cornell University. 



