74 Nl'-W YORK STATE MUSEUM 



structure with those which have been referred to the genus from the Lower 

 Siluric yet it is possible that differences may be found and Beushausen's 

 recognition of the validity of Cyrtodonta which has commonly been regarded 

 a synonym of Conrad's term Cypricardites, has been indorsed by Ulrich 

 [Pal. of Minn. 1897. 3 : 534] who has elaborately illustrated the Siluric 

 species. Cyrtodonta beyrichi in Germany occurs in the Spiriferen- 

 sandstein of the Pfartz mountains at the Kahleberg. 



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



Cyrtodonta muscula Clarke 



Plate 15, figures 1-3 



Cyrtodonta muscula Clarke. N. Y. State Mus. Bui. 107. 1907. p. 215 



Much more elongate than the preceding, retaining the pterineoid form, 

 narrow in front, widening backward and with a broad anterior sinus. Hinge 

 as in the other species. 



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



Palaeopinna flabellum Hall 



Plate 17, figures 5, 6 

 See pt i. p. 159 



This species, which we have already observed, is common at Grande 

 Greve and in the lower limestones of the St Alban division at Cape Rosier 

 cove, as well as occasional in the Oriskany of New York, from which it 

 was described, occurs here in characteristic specimens. 



Localities. On Moosehead lake, 7 miles north of Kineo and at Cun- 

 ningham's camp, 4 miles from Matagamon lake. 



Modiomorpha odiata Clarke 



Plate 15, figures 14, 15; plate 16, figures 1-5 



Modiomorpha odiata Clarke. N. Y. State Mus. Bui. 107. 1907. p. 218 



Shells elongate, depressed, convex and of considerable size ; beak at 

 the anterior third, hinge short, anterior curvature relatively narrow, the 

 valves widening backward in a low very broad curve, umbonal ridge low but 

 clearly defined making a flat or depressed posterior slope and rather straight 

 posterior margin. Length about twice the hight ; actual length of a 

 full sized example 60 mm, hight 35 mm. Surface with concentric lines 

 only. 



Casts of interiors show sharp triangular umbonal tooth and socket, a 

 low posterior ridge and tooth, sharp muscle scars and pallial impressions. 



This species is hardly to be brought into comparison with any elsewhere 

 described in this work, those of Chapman Plantation and the Grande Greve 



