454 Systematic Paleontology 



about twice as far apart as the revolving ribs, these varices do not cross the 

 flattened band above, and at their junction with the revolving ribs they 

 are elevated into rounded nodes; entire surface of the shell also marked 

 by somewhat irregular, transverse lines of growth. On the internal casts 

 the transverse varices are well marked, but the revolving ribs are faint 

 except at the junction with the varices ; the columellar cavity narrow. 



" This species most closely resembles P. whitfieldi, but, besides being con- 

 fined to an entirely different geologic horizon, the flattened upper margin 

 is more distinct, the vertical markings are mere remote varices in the outer 

 half of the last volution of the adult shells rather than regular ribs cover- 

 ing the entire shell with a distance apart about equalling the spaces 

 between the revolving ribs. Furthermore, the vertical varices in P. leno- 

 lensis end at the outer margin of the upper flattened spiral band, while 

 in P. whitfieldi the ribs apparently continue to the suture, judging from 

 the internal casts alone." — Weller, 1907. 



Type Locality. — Lenola, New Jersey. 



Occurrence. — Matawan Formation. Chesapeake and Delaware Canal 

 (exact locality unknown) . 



Collections. — Maryland Geological Survey, New Jersey Geological 

 Survey. 



Outside Distribution. — Matawan Formation. Merchantville clay marl, 

 New Jersey. 



Genus SERRIFUSUS Meek 

 [U. S. Geol. Survey, Territories, vol. ix, 1876. p. 373] 



Type. — Fusus dahotensis Meek and Hayden. 



" Shell short-fusiform ; body volution large, and bicarinate or tri- 

 carinate, with carinse more or less nodose ; spire and canal moderate, the 

 latter bent and more or less twisted ; outer lip broadly but slightly sinuous 



in outline, between the upper carina and the suture The type for 



which the subgeneric name Serrifusus is here proposed seems to be 

 entirely destitute of any traces of such plaits on the columella, and in other 

 respects more nearly related to the genus Fusus, though its shorter, bent 



Etymology: Serra saw; Fusus, a gastropod genus. 



