THE >:autilus. 43 



U. asperhnus Lea. Cited by Miles, Currier and De Camp. The 

 latter in a recent letter says : " I do not believe that it belongs to 

 the State." 



U. canadensis Lea. Three ]Mi]e Lake, Oakland County, identi- 

 fied by the late Dr. James Lewis. 



U. cariosus Say. Cited by Sag-er and Miles ; evidently an error, 

 as the species does not occur so far west. The citation is probably 

 based on some form of U. occidens Lea. 



U. ecelatus Con. Cited by Sager and Miles. In all probability 

 a case of mistaken identity. 



U. ctrculus Lea. Common in southern part of the State. Speci- 

 mens from the River Rouge are referred to U. lens Lea by Dr. De 

 Camp. 



U. coccineus Hild. Apparently quite common. A specimen 

 from the Detroit River has a pink nacre. 



U. coviplanatus Say. Northern part of the State. For an 

 account of the re-discovery of this species in this State, see the 

 Nautilus III, p. 16 and V, p. 93. 



U. cornutus Bar. Cited by Currier and De Camp. Dr. De 

 Camp writes me that this species, formerly common in the Grand 

 River, has entirely disappeared. 



U. cuneolas Lea. Cited by De Camp from Monroe County. 



U. donacifornis Lea. Mouth of Otter Creek, Monroe County, 

 collected by Jerome Ti'ombly. Cited also by Call. 



U. elegans IjQdi. Southern part of the State. Monroe and Kent 

 counties. 



Jj. ellipsis Lea. Detroit River and Grand Rapids. 



U. ellipsiformis Con. The type specimens are stated by Conrad 

 to have been received from Michigan. Were it not for the explicit 

 statement that the beaks were simple, the figure and description 

 would apply to U. spaiulatus Lea. It would seem possible that it 

 was described from specimens of that form in which the undulations 

 of the beaks, usually quite light, had so nearly disappeared as to 

 escape attention. The species has not been found by recent 

 collectors. 



U. fabalis HiQB.. The River Rouge near Detroit. Cited also by 

 Sager and Miles. 



U. gibbosus Bar. Abundant all over the State. A small variety 

 is found in the Detroit river, in which the nacre varies from a deep 

 purple to pure wliite. There is almost always, however, a trace of 

 purple along the hinge. 



