Raymond : Gastropoda of the Chazy Formation. 191 



Height of shell 14 mm., greatest diameter, n mm. 



Locality. — A very rare shell in the Chazy Limestone on Isle La 

 Motte, Vermont, where it is associated with Bucania sulcatina, Raph- 

 istoma stamineiwi, Scenella montrealensis, Clisospira bassleri, and 

 Clionychia montrealensis. Named for Professor H. M. Seely, of 

 Middlebury College, to whom, with President Brainerd, we are in- 

 debted for our knowledge of the stratigraphy of the Calciferous and 

 Chazy formations. The holotype is in the United States National 

 Museum. 



Genus Hormotoma Salter. 

 Hormotoma infrequens (Billings). 

 (Plate LV, figure 4.) 

 Murchisonia infrequens Billings, 1859, Canadian Naturalist and Geolo- 

 gist, Vol. IV, p. 457. 



In Billings' article on the "Fossils of the Chazy Limestone" this 

 species was described with other species of gastropods, but it has not 

 been figured. Only one specimen has been found, so our knowledge 

 of the species must be drawn from the type now figured for the first 

 time. 



Description. 



Shell elongate, slender, consisting of five smooth, flattened whorls. 

 The body whorl is large, making up about half the height. The 

 sutures are wide and deep and the shell thick. The body whorl is 

 somewhat flattened, abruptly deflected in a sort of carina near the 

 lower part of the whorl. The aperture is apparently entire. There 

 is no umbilicus. On the surface of the cast of the second whorl are 

 several impressed revolving lines. The body whorl retains a fragment 

 of the outer shell, but it is devoid of surface markings. 



The height of this shell is 25 mm.; the diameter of the body whorl 

 8 mm. 



Locality. — From the upper part of the Chazy at Grand Isle, near 

 Cornwall, Canada. 



The type is in the Museum of the Canadian Geological Survey. 



Hormotoma sp. 

 (Plate XLIX, figure 9.) 

 While no good specimens of this species have been found, the sec- 

 tions of long shells of the type of Murchisonia gracilis Hall are com- 



