Turritella felteri

The apical angle is 10 and the sutural angle is 6.  The shell is small, slender, elongated, and the whorls are numerous with seven or more in number.  The suture is poorly defined, and the sides of the whorls are straight.  The arrangement of the whorls are stereotypical with two large tuberculated ribs in front of which are two plain lines, followed by a space with fine plain threads followed by three finely tuberculated ribs close together (the middle one smaller than the other two).  Posterior to these is a pair of large tuberculated ribs separated by a thread.  The anterior of the last pair of ribs is more elevated and the posterior is double.  This specimen was found in the Buda limestone, Shoal Creek, Austin, Texas.