r 



Grabau — Faunas of the Hamilton Group. 



261 



Genus Glyptocardia, Hall. 



69. Glyptocardia speciosa, Hall. 



= Cardiola retrostriata, Von Buch. 



1885, Hall, Pal. N. Y., vol. 5, pt. 1, p. 426, pi. 70, 80. 



A fragment of the left valve of this strongly marked species was found 

 in the Strophalosia bed. The height of the specimen is 10 mm. and the 

 surface characters are well preserved. 



BRACHIOPODA. 



Genus Lingula, Bruguiere. 



70. Lingula Lean a, Hall. 



1867, Hall, Pal. N. Y., vol. 4, p. 9, pi. 2. 



This species occurs in the Lower shales where I have found specimens at 

 a depth below the Encrinal, ranging from eight to fourteen feet. A single 

 specimen has been obtained as low as twenty feet at Section B. The specimens 

 are usually much flattened, and seldom show the faint radiating stria?. Two 

 specimens from a depth of nine feet measured:- length, 12 and 13 mm.- width 

 9 and 10 mm. respectively. 



71. Lingula Delia, Hall. 



1867, Hall, Pal. N. Y., vol. 4, p. 12, pi. 2. 



The few specimens obtained show the usual outline and size of this 

 species, together with the mark of the median septum, characteristic of the 

 brachial(?) valve. The species occurs below the Encrinal limestone. 



72. Lingula spatulata, Vanuxem. 

 1867, Hall, Pal. N. Y., vol. 4, p. 13, pi. 1. 



At Section B, at a depth of from twelve to fourteen feet below the 

 Encrinal limestone, I found six specimens which show the characteristics of 

 this species. Another specimen was found in the S. demissa bed. The sides 

 of these specimens regularly curve to the beak, and the front is evenly 

 rounded. The specimens are rather more convex than the ordinary forms 

 from the Genesee beds, and the slope of the sides is consequently a more 

 abrupt one. The surface is gently arcuate from beak to base, and near the 

 beak the slope of the lateral margin is somewhat more abrupt. Concentric 



