Number 78 March i, 1920 



OCCASIONAL PAPERS OF THE MUSEUM OF 

 ZOOLOGY 



UNIVERSITY OF MICHIGAN 



Ann Arbor, Michigan Published by the University 



A NEW SPECIES OF GONIOBASIS 



By Anson A. HinkeEy 



Goniobasis goodrichi, new species. 



Description : Shell acutely conical, solid ; the last half whorl 

 rather thin; color light brown. Apex of shell eroded, leaving 

 six whorls entire (probably a perfect specimen would have ten 

 or twelve whorls). Suture well defined. Surface of whorl 

 marked with twelve to fourteen plications, slightly curved and 

 covering all except the last half whorl. Whorls with many 

 microscopical revolving lines which on some of the earlier 

 whorls amount to carinse. Body whorl angular or subangular 

 (in young specimens the angle of the periphery is sharp). 

 Aperture is ovate, with sinus below; acutely angled above; 

 outer lip a little sinuate; columella curved, a little reflected; 

 parietal wall with a thin callus, darkly colored. Operculum 

 ovate, thin, brown ; polar point close to the base on the left side. 



