NEW YORK STATE MUSEUM 



Phragmostoma diopetes Clarke 



Plate 12, figures 9-13 



Phragmostoma diopetes Clarke. N. Y. State Mus. Bui. 107. 1907. p. 192 



A small bellerophontid with well developed slit band and apparently 

 smooth surface save for regular concentric growth lines. The shell expands 

 rapidly to an explanate mouth which involves the spire and forms a broad 

 flat plate on the posterior region with the callus about the spire extending 

 into the aperture, making a structure altogether similar to that of P. 

 natator (Portage group), the type of the genus. 



Locality. Matagamon lake, Me. ; on east side i mile above dam. 



Aviculopecten alcis Clarke 



Plate 13, figure 5 



Aviculopecten alcis Clarke. N. V. State Mus. Bui. 107. 1907. p. 195 



Shell slightly oblique with anterior beak and short anterior wing. 

 Hinge and posterior wing not extending as far back as the body outline. 

 Curvature of the margin gently convex in front and anterolaterally, nar- 

 rowed and slightly produced behind. Body of the shell gently convex ; 

 length and hight equal. Surface covered by fine radial riblets of unequal 

 size, close together, generally with some tendency to fasciculation behind, 

 fine and fainter and closely crowded in front. These are all crossed by very 

 fine concentric lines and coarse concentric wrinkles which are quite irregu- 

 larly spaced. This description is based wholly on a left valve to which it 

 has seemed unsafe to refer any associated right valves. Though there are 

 ribbed Aviculopectens in all the formations here brought under considera- 

 tion I know none which agrees with or approaches this. 



Locality. Moosehead lake, 7 miles north of Kineo, Me. 



Aviculopecten cf. gebhardi (Hall) 



Plate 14, figures 8, q 



See Palaeontology of New York. 1859. 3: 466, pi. 110, fig. i ; pi. in, fig. 2 



This is a large Aviculopecten of which we have both valves in rather 

 inferior preservation, but showing coarse radial ribs and having the 

 outline and contour of the species cited, which is from the Oriskany of 

 Schoharie. 



Locality. Cunningham's camp. 



