1908.1 



NATURAL SCIENCES OF PHILADELPHIA. 



47 



strongly developed constitutes Succinea ohliqua Say. Succinea 

 ovalis of Messrs. Gould, Adams, Mighels and Sager is not the ovalis 

 of Say, but a species which was unknown to him. As, however, the 

 ovalis of Gould is that now most commonly known under the name 

 of Succinea ovalis, we propose to retain it, and to appl}^ to Mr. Say's 

 species his second name, ohliqua." 



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Fig. 1. — Tablet bearing Succinea 

 ovalis, mounted -and labelled by 

 Thomas Say. Nat. size. 





Fig. 2. — Say's tablet of Succinea 

 ohliqua. Nat. size. 



The tablet of three specimens of S. ovalis labelled by Say is photo- 

 graphed, fig. 1. A series of modern specimens from Fairmount Park 

 is shown, fig. 3. These show a considerable amount of variation in 

 contour, some being as long as Say's types of S. oUiqun, shown in fig. 2. 

 Philadelphian examples do not attain a large size, rarely exceeding 16 

 or 18 mm. in length. It is a region of crystalline metamorphic rock, 

 deficient in lime, where the land shells generally run under the size 

 usual in New York or the West. The color is yellowish green, and the 

 shell very thin. 



This type of shell is widely distributed, from Ontario to the mountains 

 of North Carolina and west to Minnesota and Missouri. 



Fig. 3. — Succinea ovalis Say. Fairmount Park, Pliiladelphia. Nat. size. 



In the examples of S. ovalis taken at Chittenango Falls the upper part 

 of the spire in living animals is whitish with a papery appearance, the 

 last whorl is pale buff, becoming olivaceous and dusky over the lung. 

 This is in some examples more or less obscured by a gray network, 



