690 CRETACEOUS PAI^EONTOLOGY. 



the shell also apparently slight; surface of the shell unknown." 

 (Whitfield.) 



The dimensions of an average-sized adult specimen are: max- 

 imum diameter, 25 mm.; height, 19 mm.; height of aperture, 23 

 mm.; width of aperture, 12 mm. 



' Remarks. — This species is the commonest member of the 

 genus in the New Jersey faunas, and also- has the greatest ver- 

 tical range, although the horizon where it occurs most commonly 

 is the Navesink marl. The species most closely resembles G. 

 ahyssina, but .it is always smaller than adult individuals of that 

 species, and can be distinguished by the conspicuous flattened 

 space at the summit of the volutions, just outside the suture. 



Formation and locality. — ^Merchantville clay-marl, near James- 

 burg (139), Lenola (163); Wenonah sand, near Ci^awfords 

 Corner (126^), near Marlboro (130) ; Navesink marl, Atlantic 

 Highlands (108), Middletown (113^), near Crawfords Corner 

 (126'^), near Holmdel (128^), near Walnford (148^), Cross- 

 wicks Creek (149, 147*, 195), near Jacobstown (150), Mullica 

 Hill (1692); Red Bank sand, Red Bank (116), near Middle- 

 town (112). 



Geographic distribution. — New Jersey, Alabama, Mississippi, 

 Texas. 



Family XENOPHORIDAB. 



Genus Xenophora Fischer. 



J 



Xenophora leprosa (Morton). 



Plate LXVIIL, Fig, 1-3. 



1834. Trochus leprosits Mort., Synop. Org. Rem. Cret. Gr. U. 



S., p. 46, pi. 15, fig- 6. 

 1861. Pkorus leprosus Gabb, Synop. Moll. Cret. Form., p. 124 



(85)- 

 1864. Phorus leprosKs Meek, Check List Inv. Foss. N. A., Cret. 



and Jur., p. 18. 

 1868. Onustus leprosits Con., Cook's Geol. N. J., p. 728. 



