758 CRETACEOUS PALEONTOLOGY. 



Remarks. The type specimen is the only individual of this 

 species which has been seen, and it forms an exception to most of 

 the gastropods of the Navesink marl, in that the form of the shell 

 itself is preserved. The internal cast of the species has not been 

 recognized. 



Formation and locality. Navesink marl, Holmdel (Whitfield). 



Geographic distribution. New Jersey. 



Fusus lorillardensis n. sp. 

 Plate LXXXIX., Figs. 9-10. 



Description. The dimensions of the type specimen are : height, 

 53 mm.; height of spire, 23 mm.; greatest diameter, 18 mm.; 

 apical angle about 34. Shell elongate-fusiform, with six or seven 

 volutions, the outer volution produced into an elongate anterior 

 canal ; suture moderately impressed ; the surface of the volutions 

 of the spire regularly convex from suture to suture. Surface of 

 the shell marked by a revolving ridge or shoulder of moderate 

 size just below the suture; each volution marked by from 15 to 

 1 8, or less upon the smaller volutions, rather sharp, elevated, 

 vertical, slightly curved ridges, the concave side of the curve 

 towards the aperture; on the volutions of the spire the ridges 

 continue from suture to suture but on the outer volution they 

 become obsolete a little less than half way from the suture to 

 the anterior extremity of the canal; surface also marked by fine 

 revolving costse, three or four of which occupy the space of one 

 millimeter, and by distinct transverse lines of growth which have 

 ,a broad but slight sinuosity below the suture, following the di- 

 rection of the transverse ridges. 



Remarks. This shell somewhat closely resembles F. (Exili- 

 fusus} kerri Gabb, from North Carolina, 1 but it is less slender 

 with a less extended anterior canal, giving to the spire a relatively 

 greater height. The type is a partial internal cast with the nearly 

 complete external mould, from which a plaster cast has been taken. 

 The transverse ribs are clearly visible on the internal cast, but they 

 are broadly rounded and much lower than on the shell itself. 



'Proc. Acad. Nat. Sci. Phil. (1876), p. 279, pi. 17, fig. i. 



