46 THE NAUTILUS. 



borders. I notice that in the Kautilus for November, 1891, p. 78, 

 Mr. G. W. Dean says that Anthony's distaiis is the female form of 

 U. luteolus Lam. Call (loc. cit.) also refers U. distans to luteolus. 

 Lea, however, refers it to radiatus. 



U. ranglainis Lea. Fighting Island, Detroit river, and the River 

 Raisin, Monroe Counties, are the only localities where this species 

 has yet been found to my knowledge. Credited to Michigan by 

 Call (loc. cit.) 



U. rectus Lam. Not uncommon in the southern part of the State. 

 A form from the Detroit river was described as U.Sagerihy Conrad 

 and another variety from the Huron river, Livingstone county, as 

 U. leprosus by Miles. Specimens from the River Rouge, Wayne 

 county, are fully as wide as any from the Ohio river, but longer, 

 more compressed and not so heavy, the nacre being either white or 

 purple. Detroit river specimens are only about half as large as 

 Rouge river examples, with the nacre tinged with purple toward the 

 hinge, or occasionally of a beautiful salmon color. 



U. rahiginosus Lea. Common in the southern part of the State. 



TJ. Schoolcraftii Lea. Not a common species, but cited in nearly 

 all the lists. 



U. spatulatus Lea. Very abundant in many localities. 



U. subovatus Lea. Cited by Miles, Currier and De Camp. Spec- 

 imens sent to correspondents as U. ventrieosus Bar., have been 

 referred by them to this form. 



U. subrotundus Lea. Cited by Sager and Miles only. As it has 

 not been found by later collectors it is to be considered a doubtful 

 inhabitant of the state. 



U. sulcatus Lea. Detroit river. Specimens from that locality 

 were described as U. perobliquus by Conrad. 



U. Tappanianus Lea. " Have this from Monroe County, Mich- 

 igan, that agrees well with Lea's figure and description ; but think 

 it the same as siliquoides, only a variety of luteolus. The beaks are 

 eroded on the specimens I have, so that I cannot decide well on the 

 undulations " — De Camp. I know nothing of the occurrence of this 

 species in the State, beyond the above note from Dr. De Camp, 

 which seems to leave the identification somewhat in doubt. 



U. tenuissvnus Lea. Cited by De Camp from the Grande river. 

 Also by Miles and Currier. 



U. trigonus Lea. Cited by De Camp from Black Lake, Ottawa 

 county ; also by Miles and Currier. 



