412 Systematic Paleontology 



Cylichna recta Whitfield, 1892, Mon. U. S. Geol. Survey, vol. xviii, p. 164, 



pi. xx, figs. 10, 11. 

 Cylichna recta Johnson, 1905, Proc. Acad. Nat. Sci., Phila., p. 19. 

 Cylichna recta Weller, 1907, Geol. Survey of New Jersey, Pal., vol. iv, p. 



814, pi. xcix, figs. 17, 18. 



Description. — " Shell small, subcylindrical ; spire very much depressed ; 

 mouth nearly straight and narrow. A cast." — Gabb, 1840. 



Type Locality. — Green marl, Burlington County, New Jersey. 



Shell small, involute, subcylindrical in outline; aperture more pro- 

 duced than the body whorl both posteriorly and anteriorly ; external sur- 

 face smooth medially, sculptured with faintly incised lines upon the 

 anterior third and the posterior fourth, the posterior spirals numbering 

 only about half a dozen and more distantly spaced than the twelve or 

 fifteen anterior spirals; aperture narrow, expanding slightly in front and 

 somewhat patulous ; outer lip thin, sharp, approximately vertical, and 

 parallel to the body wall; columella reinforced and slightly reversed at 

 the base of the body ; parietal wall entirely free from callous. 



This small species is exceedingly rare in Maryland. 



Occurrence. — Monmouth Formation. Brightseat, Prince George's 

 County. 



Collections. — Maryland Geological Survey, Philadelphia Academy of 

 Natural Sciences, New Jersey Geological Survey. 



Outside Distribution. — Matawan Formation. Wenonah sand, New 

 Jersey. Monmouth Formation. Navesink marl, New Jersey. 



order CTENOBRANCHI ATA 



Suborder TOXOGLOSSA 

 Family CANCELLARIIDAE 

 Genus PALADMETE n. gen. 

 Type. — Trichotropis cancellaria Conrad. 



Shell rather small and thin, spire more or less scalariform, moderately 

 elevated ; the aperture in the type species approximately half as high as the 

 entire shell; nucleus paucispiral, thrice coiled in the type species, the 



Etymology: 7ra\aios(paleo-), ancient; Admete, a genus of the Cancellariidae 

 characterized by the absence of columellar folds. 



