Welter — Kinderhook Faunal Studies. 191 



and the external markings, have been observed. The speci- 

 men illustrated is a good example of the species. In the 

 University of Michigan collection this specimen is designated 

 as one of the types of Murchisonia qitadricincta Win., but is 

 probably not even cogeneric with this species. 



Pleurotomaria ? quinquesulcata Win. 



PL XVII. f. 10-11. 



Original description. " Shell of medium size, depressed 

 conical, consisting of three or four rapidly enlarging whorls. 

 Outer whorl nearly as wide as all the others, having a nearly 

 circular section, and presenting on its exterior about five 

 longitudinal furrows, covering the space from the suture above 

 to the base below ; shell otherwise apparently smooth." 



"Diameter of last whorl 27 mm.; height of spire about 

 18 mm." 



Remarks. The specimen here illustrated is believed to be 

 the type of the species although it is not so marked. It is 

 the only specimen so labeled in the University of Michigan 

 collection, and agrees exactly with the measurements given by 

 Winchell. The specimen is a very imperfect one, and it is 

 impossible to determine its generic relations. The revolving 

 furrows mentioned by Winchell seem to be wholly imaginary. 



Pleurotomaria ? sp. undet. 



PL XVII. f. 12. 



A single specimen of a small coiled shell with a low spire, 

 has been observed. Its generic relations cannot be deter- 

 mined and so it is only referred provisionally to the genus 

 Pleurotomaria. 



Straparollus obtusus (Hall). 



PL XVII. f. 6-8. 



Original description. " Shell discoid, planorbiform. Spire 

 little elevated, consisting of five or six volutions which 

 increase in size very gradually from the apex; largest outer 

 volution very obtusely angular on the upper side towards the 

 outer margin, and below this somewhat flattened to the peri- 

 phery of the shell below, where it is very regularly and 

 symmetrically rounded; upper side, from the obtuse angle 



