462 PROCEEDINGS OF THE ACADEMY OF [July, 



sizes which override axials; suture impressed, aperture lenticular 

 and produced anterior^ into a canal; outer lip thickened and dentate 

 within, broadly notched between suture and medial part of outer 

 margin of aperture; inner lip thinly calloused, columella smooth and 

 slightly sinuous. 



The nuclear characters, the sharp cancellate sculpture, and inter- 

 mediately thickened outer lip which is broadly notched in front of 

 the suture seem to assign this form to the rank of a subgenus under 

 Fusus. This form bears some resemblance to Phos in general outline, 

 but is much more slender. Phos is characterized by a columella 

 which is much more sharply twisted. Anomalofusus has a longer 

 canal than any of the Buccinidse and lacks the abruptly excavated 

 columella, plicate in front, which is characteristic of Phos. Besides 

 nuclear characters, Anomalofusus differs from Fusus in its shorter 

 canal, and further by its thickened and notched outer lip. 



Fusus (Anomalofusus) substriatus sp. nov. PI. XXIII, figs. 9, 10, 11. 



Description. — Shell of medium size and elongate, fusiform in 

 outline; spire acuminate and of approximately the same length as 

 the aperture; whorls roundly shouldered, three to five in number on 

 conch; protoconch naticoid and smooth, coiled about three times; 

 external sculpture elaborate, axials predominating, costse well rounded 

 and elevated, irregular in size and spacing, reaching from anterior 

 to posterior suture on spiral whorls, but evanescing on anterior part 

 of body ; spiral sculpture consisting of about 14 small primary elevated 

 lirse and in each interspace there are from one to three very fine 

 primary lirse, primary lirse lacking on a narrow band just in front of 

 suture, both primary and secondary lirse override costse; suture 

 impressed; aperture lenticular and produced anteriorly into a canal; 

 outer lip thickened and dentate within, broadly notched between 

 suture and medial part of outer margin of aperture; inner lip cal- 

 loused; columella smooth and slightly sinuous. 



Dimensions. — Immature individual: Altitude, 17.5 mm.; length 

 of aperture, 9.5 mm. ; maximum diameter, 7.5 mm. ; spiral angle, 35°. 



This elegantly sculptured gastropod is abundant at Coon Creek. 

 There is a wide range in the maturity of individuals, some have only 

 one whorl of the conch, while the older ones have five whorls. The 

 protoconch is preserved and conspicuous on most specimens. 



Occurrence. — Ripley Formation: Dave Weeks Place, on Coon 

 Creek, McNairy County, Tennessee. 



