Maryland Geological Survey 417 



TURRIS WELLERI n. sp. 



Plate XIV, Fig. 7 



Description. — Shell moderately large for the genus, fusiform in out- 

 line ; whorls numerous, probably about ten in all; apical angle from 15° 

 to 20° ; apex broken away and nuclear characters lost; external sculpture 

 dominantly axial; costs rounded, rather prominently elevated, and, on the 

 spire, uniform in prominence from the fasciole to the anterior suture, 

 though tending to grow broader, undulatory and irregular in size and 

 spacing upon the body; spiral sculpture of feeble and somewhat irregu- 

 larly spaced, impressed lines approximately nine in number upon the 

 penultima, equally faint upon the costal and intercostal areas; base of 

 body whorl and pillar sculptured with relatively strong, elevated spirals, 

 probably twelve to fifteen in all, rather distantly spaced upon the base of 

 the body, increasingly more crowded toward the anterior extremity of the 

 pillar ; siphonal fasciole sharply differentiated by a deeply impressed 

 linear sulcus, undulated by the costa? of the preceding volution; suture 

 line distinct, closely appressed ; aperture imperfect in the type, pyriform, 

 its altitude probably a little less than half that of the entire shell; 

 siphonal notch as deduced from the growth lines, in front of the fasciole ; 

 outer lip broadly arcuate; a little more gradually constricted anteriorly 

 than posteriorly ; inner lip excavated at the base of the body, non-plicate ; 

 parietal wall washed with callous ; pillar long and straight. 



Dimensions (imperfect individual). — Altitude 40.2 mm., maximum 

 diameter 17.5 mm. 



Turris ivelleri has no very striking diagnostic characters, although no 

 other species described from this area combines the prominent and, with 

 the exception of the body whorl, regular axial sculpture with the irregular 

 and very faint spiral sculpture. 



This species is named for Prof. Stuart Weller, of the University of 

 Chicago. 



Occurrence. — Monmouth Formation. Brightseat, Prince George's 

 County. 



Collection. — Maryland Geological Survey. 



