to corroborate Dr. Miles’ supposition that the two had been 
confounded by the early collectors. It should be stated, how- 
ever, that Dr. Miles’ note was written before the discovery of 
P. clausa in Kent county had been made and when the speci- 
men in the Lathrop collection was the only known Michigan 
specimen of either species. 
18. PoLyGyrRA HIRSUTA (Say). 
Common where found, but apparently local in its distri- 
bution. Macomb, Wayne, Washtenaw and Monroe in the 
southeastern part of the state and Kent in the western are 
the only counties thus far to be credited with it. 
19. PoLyGyrA MONODON ( Rack.) 
This is one of the few /o/ygyre reported from the upper 
peninsula and the returns indicate that it is found generally 
over the whole state, ‘‘Not abundant in Kent county,” 
Streng. 
19a. PoLYGYRA MONODON ALBIDA N. V: 
Pale greenish-white. Charlevoix and Grand Rapids. 
The latter example is peculiar in having a double parie- 
tal tooth. The last half of the body whorl was ev idently 
badly crushed just as the parietal tooth had begun to be 
formed. In rebuilding the shell, the new lip was formed 
slightly behind where it normally should have been, and a 
new parietal tooth deposited diverging from the first one at a 
slight angle, so that the two make ar. 
19b. PoLyGyRA MONODON FRATERNA (Say). 
Appears to be of general distribution south of the Sagi- 
naw-Grand Valley, but as yet has not been reported further 
north. 
‘* Not abundant in Kent county,” Streng. 
19c. POLYGYRA MONODON Rack. var. 
In the DeCamp collection are two examples of a small 
form of this species which deserve special mention. Unfortu- 
nately no exact locality is mentioned, simply ‘* Michigan.’ 
They are imperforate like »onodon alici@, but have the spire 
more depressed with the suture less impressed, and the last 
whorl is inclined to be obtusely angled rather than regularly 
rounded as in that form. Their dimensions are as follows: 
3%, mm. Lesser diam. 
2 
IZ iad 66 
4 
Abt. 54% mm. Greater diam. 7 
th 
1702. 
be 434 ee sé 66 
~] ~I 
