MOLLUSCA. 761 



Serrifusus crosswickensis Whitfield. 

 Plate LXXXIX., Figs. 14-17. 



1892. Serrifusus ? Crosswickensis Whitf., Pal. N. J., vol. 2 

 (Monog. U. S. G. S., vol. 18), p. 63, pi. 5, figs. 24-25. 



Description. '"Shell small or of medium size, biturbinate in 

 form, shorter below than above the middle, exclusive of the 

 beak, the extension of which is unknown, casts only having been 

 observed; spire broadly conical, the apical angle measuring 

 about 55; volutions about four and a half or five on the inter- 

 nal cast; angularly ventricose, vertical or concave on the 

 periphery, the latter character particularly a feature of the body 

 volution ; upper side of the volutions obliquely sloping, the slope 

 being somewhat greater than the angle of the spire, so as to 

 reveal the vertical portion of each volution ; lower side rounded ; 

 aperture nearly as broad as high, as seen in a transverse section, 

 the outer lip slightly biangular, corresponding to the narrow 

 vertical band of the periphery; columella strong, indicating a 

 rather robust beak; surface features unknown." (Whitfield.) 



Remarks. This species is an uncommon form in the Nave 

 sink marl fauna, only a single specimen, aside from the type, 

 having come under the observation of the writer. Both these 

 specimens are internal casts, so the external characters of the 

 shell are wholly unknown. 



Formation and locality. Navesink marl, Atlantic Highlands 

 (108), Crosswicks Creek (Whitfield). 



Geographic distribution. New Jersey. 



Genus ODONTOFUSUS Whitfield. 



Odontofusus medians Whitfield. 

 Plate XC., Figs. 1-6. 



1892. Odontofusus medians Whitf., Pal. N. J., vol. 2 (Monog. 



U. S. G. S., vol. 18), p. 67, pi. 5, figs. 18-21. 

 1892. Pyrifusus turritus Whitf., Pal. N. J., vol 2 (Monog. U. 



S. G. S., vol. 18), p. 54, pi. 5, % 4 (not figs. 1-3). 



