2 University of Michigan 



regularly rounded. The apex not very acute. The growth lines 

 are fine, numerous, interrupted by several rest scars which give the 

 operculum the appearance of an opening fan. The nucleus is 

 sunken and in the lowermost third of the operculum, being a little 

 closer to the left margin than to the right. Two widely coiled 

 whorls of the spiral development are easily traceable, the whole 

 number of whorls being three. The area of attachment takes up 

 about half of the anterior side. 



Measurement of the type: Altitude, 23 mm.; diameter, 8| mm.; 

 height of aperture, 8 mm. 



Type locality: Little ]Muddy Creek, Dubois, Washington Co., 

 111. Mr. A. A. Hinkley, collector. 



Type: No. 10587, Musevmi of Zoology, University of Michigan. 



Remarks: Mr. Hinkley has distributed these shells under the 

 name Pleurocera neglectum Anth. upon the identification of Tryon. 

 In a letter to me in 191 5 Mr. Hinkle}- says he has long questioned 

 this determination. P. hinkleyi is apparently an offshoot of 

 P. acuta Raf., the Melania subularis of Lea. It differs from that 

 species in its uniform thinness and delicacy, the generally con- 

 stricted appearance of the whorls and, if such a characteristic has 

 right to a standing, in the bright smoothness of the surface. I 

 think it is a good local race and is entitled to specific distinction. 



Goniobasis vanhyningiana, new species 



Description: Shell small, narrow, attenuate. Apex eroded, 

 six whorls remaining; a perfect adult specimen would probably 

 have eight or nine whorls. The whorls are slightly flattened, 

 angulated at the base save in the case of the last whorl, which is 

 rounded. Shell folded to base of last whorl. Where the folds 

 intersect carinae at the base of each whorl slight nodules are formed, 

 giving a beaded effect. Two fine, raised, revolving fines appear 

 on the body whorl below the periphery. Suture deeply impressed. 

 Color dark, rusty brown. Peristome sinuous, a little produced 



