174 Annals of the Carnegie Museum. 



Description. 



Shell small, aperture narrowly elliptical in outline. Height about 

 equal to the greater diameter of the aperture. Beak small, pointed 

 forward but not incurved. Anterior slope nearly straight. Posterior 

 slope convex above, becoming straight below. Surface smooth, except 

 for a few low concentric undulations near the base. Beak a little in 

 in front of the middle. 



The greater diameter of the aperture is 1 1 millimeters, the lesser is 

 6.5 millimeters, height 11.5 millimeters. 



Locality. — This shell occurs rarely in the Lower Chazy south of 

 the lime kilns at Chazy, New York. The specimen selected as the 

 type is from the Middle Chazy at Lenoirs, Tennessee, and is in the 

 Yale University Museum. 



Scenella robusta Raymond. 



(PlateXLVII, figures 1-2.) 

 Scenella robusta Raymond, 1905, American Journal of Science, Series 



4, Vol. XX, 376. 



Description. 



Shell large, aperture nearly circular. Beak obtuse, rather high, a 

 little in front of the center. All slopes about equal and all convex. 

 The whole shell is somewhat hemispheric. The specimens are all 

 casts, showing no surface markings of any sort. This species some- 

 what resembles Scenella superba (Billings), but has a more depressed 

 form, and a blunter apex. 



The only perfect specimen is 17 millimeters in greater and 16 milli- 

 meters in lesser diameter. A much larger specimen is represented by 

 a fragment 27 millimeters long, but, when complete, it was evidently 

 considerably larger. 



Locality. — Valcour Island in the Middle Chazy beds. Rare. 

 Type in the Carnegie Museum. It occurs also at Lenoirs, Tennessee, 

 and figure 1, Plate XLVII, is from a specimen obtained at that 

 locality. 



Genus Palaeacmaea Hall and Whitfield. 



Palaeacmaea irregularis Raymond. 

 (Plate LIV, figures 10-12.) 

 Palaacmcea irregularis Raymond, 1905, American Journal of Science, 

 Series 4, Vol. XX, p. 376. 



