14. PoLYGYRA ELEVATA (Say). 
Very rare. Until recently Niles, Berrien county, was the 
only locality known. A fine specimen from Grand Rapids 
has lately been submitted for examination by Mr. W. Miller 
of that city, who also reports it from Reed City, Osceola 
county. It has been reported as fossil in the recent deposits 
at Ann Arbor by Beecher. 
15. PoLYGYRA THYROIDES (Say). 
Generally distributed through the southern part of the 
state. It also occurs in the marl deposits at Traverse City. 
16. PoLYGYRA CLAUSA (Say). 
Very rare. A single specimen from Grand Rapids col- 
lected by Mr. W. Miller has recently been submitted for 
examination and is the only authentic record of the occur- 
rence of the species in the state. It was first cited by Sager 
and subsequently by Miles. Currier included it in his first 
catalogue (1859), but omitted it in his later lists. This 
would indicate that he was not satisfied that his first citation 
was correct. I have not been able to verify any of the earlier 
citations for this species. It is not to be found among the 
remnants of the collection of the Flint Scientific Institute 
now deposited in the High School at Flint, nor in the Miles 
collection at the Agricultural College. The following note 
by Dr. Miles in his annotated report to the Census is the only 
information accessible. 
‘*Sager’s listing of AZ. clausa as a Michigan species was 
repeatedly verified in the early collections of shells in Gene- 
see county by members of the Flint Scientific Institute. 
Unfortunately these specimens have been scattered and lost. 
As Binney in Terr. Moll. I], p. 109, makes HZ. mztchelliana a 
synonym of //. c/ausa, no attempt was made to separate the 
two forms and it may be that we labeled c/ausa in some cases 
that would now be placed under mez/chelliana.” 'The fact that 
the specimen of mzfche/iana in the Lathrop collection was 
labeled ‘‘c/ausa”’ would seem to substantiate this view as Dr. 
Lathrop was in quite intimate relations with the Flint 
naturalists. 
17. PoLYGYRA MITCHELLIANA (Lea).. 
A single specimen from Armada, Macomb county, in 
the Lathrop collection, now in my possession, is the only 
recorded occurrence of this species in Michigan. It was 
labeled ‘‘c/ausa.” The fact that this species has been found 
in the eastern part of the state would to a certain extent tend 
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