Occasional Papers of the Museum of Zoology 9 



19 mm., altitude of the aperture 15.00 mm., at the aperture 

 10 mm. 



36. Planorhis antrosiis (Con.). — Schoolcraft: From logs 

 and sand in Buschwahr Creek. 



2)"/. Planorhis antrosiis striatiis (Baker). — Schoolcraft: 

 From weeds in Beaver Pond. Chippewa : From pond lily 

 leaves in Beaver Pond, a pond on the beach at Vermilion, and 

 leaves in Vermilion Lake. All of this form in the collection 

 tend to have the rounded whorls of var. aroostookensis. 



38. Planorhis hirsutiis Gld. — Chippewa: Four specimens 

 from Beaver Pond, and several from* Vermilion Lake at Ver- 

 milion. 



39. Planorhis dcflccius Say. — Alger: Immature shells 

 from lily leaves. Chippewa : Vermilion Lake, Vermilion. 



40. Planorhis parvus Say. — Chippewa : A good series of 

 this small shell was collected from pond lily leaves in Beaver 

 Pond. Some of the immature specimens are apparently more 

 deeply umbilicated than others and may represent another 

 form ; but all the mature shells are parvus and these are prob- 

 ably also a variation of that species. 



41. Planorhis unthilicafcllus Ckll. ? — Chippewa: Black ash 

 swamp, \'ermilion. One small somewhat deformed specimen. 



42. Scgincntina annigcra (Say). — Schoolcraft: One lot 

 is typical annigcra, and was collected from rotten leaves in a 

 wooded swamj:). 



43. Scgmcntina armigcra (Say) var. — -Schoolcraft: From 

 leaves and sand bottom in wooded pool and from rotten leaves 

 in a wooded swamp. One lot is nearest to S. crassilahris 

 Walker in shape, but the lamellae and aperture approach those 

 cf armigcra. None are typical armigcra in all points. 



