Raymond : Gastropoda of the Chazy Formation. 203 



Description. 



Shell small, loosely coiled, apex acute, incurved, but not making a 

 closed volution. The shell is roughly quadrangular in cross-section, 

 flattened on top, sloping outward and downward on the side and 

 obtusely angulated at the lower angle ; rounded below and on the 

 inside. The specimen is a cast and does not show any surface mark- 

 ings. This species may be separated from both Eccyliomphalus fred- 

 ericus and E. proclivis by its quadrangular cross-section. Eccyliom- 

 phalus fredericus is circular in cross-section and Eccylio7nphalus pro- 

 clivis triangular. 



Locality. — A very rare fossil in the Chazy Limestone at Sloop Bay, 

 Valcour Island, New York. Named for the explorer and naturalist, 

 Pehr Kalm, who visited this region in 1749. 



The type is in the collection at the Yale University Museum. 



Eccyliomphalus proclivis Raymond. 

 (Plate LIII, figure 5.) 

 Eccyliopterus proclivis Raymond, 1906, Annals of the Carnegie 

 Museum, Vol. Ill, p. 576. 



Description. 



Shell loosely coiled, apex acute, scarcely incurved. Cross-section 

 of cast triangular. Upper surface flat, the lower side acutely angulated. 

 Both inside and outside are gently convex. The cross-section of this 

 shell easily separates it from either of the preceding species. 



Locality. — A very rare fossil in the Chazy at Crown Point, New 

 York. 



The type is in the collection of the Carnegie Museum. 



Eccyliomphalus sp. ind. 

 (Plate LT1I, figure 6.) 

 On the surface of a fragment of sandstone from the basal beds of 

 the Chazy at Valcour Island are three small specimens of a species of 

 Eccyliomphalus. The shell is small, nearly circular in cross-section, 

 regularly and evenly coiled, the whorls almost touching. This form 

 is more like Eccyliomphalus fredericus than any of the other species, 

 but differs from that shell in its more regular and more closely coiled 

 whorls. 



