1916.] NATURAL SCIENCES OK PIflLA DKI.IMI I A . ! I, | 



acute, broken away, but protoconch as indicated by the scar probably 

 very small; whorls of spire slightly flattened dorso-ventrally, con- 

 stricted posteriorly, ultima merging smoothly into a wide pillar; 

 external ornamentation quite coarse and elaborate: axial sculpture 

 of rounded quite strongly elevated costae waving backward along 

 the shoulder, 11 to 14 to the volution, costae becoming shorter and 

 less prominent on approaching the aperture, on young whorls costae 

 reach from posterior fasciole to anterior suture, but become shorter 

 anteriorly and occur only along the shoulder of the whorl: posterior 

 part of whorl constricted and marked by a narrow posterior fasciole 

 set with closely spaced spinose, varix-like processes, most of these 

 processes broken away in type; spiral sculpture absent on first three 

 apical whorls, becoming more prominent anteriorly until conspicuous 

 on body whorl; more than thirty strongly elevated spirals on body 

 whorl, spirals more widely spaced on medial portion of body whorl ; 

 spirals along medial portion of body somewhat arcuate on type with 

 most gentle slope anteriorly; body w T horl sloping gently into a broad 

 pillar; aperture lenticular and produced anteriorly into a canal; 

 inner lip calloused, parietal wall thinly washed; fold in front of one 

 or two less prominent folds, all of which become obsolete before 

 reaching the opening of the aperture. 



Dimensions. — Imperfect specimen: Altitude, 85 mm.: maximum 

 diameter, 32 mm.; spiral angle, 30°. 



This magnificent species is represented in the present collection 

 from Coon Creek by two individuals, both of which, while imperfect, 

 yet show the essential characters of the shell. It is well characterized 

 by the elaborate axial and spiral ornamentation, the very acuminate 

 spire and further by the spinose varix-bearing posterior fasciole. 



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

 Creek, McNairy County, Tennessee. 



Family FUSID^E. 



Genus FUSUS Lamarck. 



Subgenus A.NOMALOFUSUS subgen. nov. 



Etymology: avatpLaXos, irregular; fusus, a gastropod. 



Type: Fusus (Anomalofusus) substriatus sp. nov. 



Shell of medium size and elongate, fusiform in outline: spire 

 acuminate and of approximately the same length as the aperture; 

 protoconch naticoid and smooth, coiled about three times; axials 

 most prominent ornamentation, costae irregular in size and spacing; 

 spiral sculpture consisting of many fine elevated line of different 



