OF DENISON UNIVERSITY. 
13 
Sp. 4. Lingula ATRA. Hemck. (Described beyond) 
Medium size, oblong, length to width as 9 to 5, beak larger than 
a right angle. Below 2d fall, Cuyahoga Valley. 
Sp. 5 . Lingula cuyahoga. Hail. 
Medium size, elongate oval, length and width as ii to 6, beak 
nearly a right angle. Below 2d fall, Cuyahoga Valley. 
Sp. 6. Lingula MEEKI Herrick. (Described beyond.) 
\ 
Medium size, rather broadly oval or lepidiform, length to width 
as 12 to 8.5. Below 2d fall, Cuyahoga Valley. 
Sp. 7. Lingula MELiE. Hail. 
Small acutely oval, length as 1 2 to 8, beak acute, with a depressed 
median line extending from the beak. 
Shale above Berea grit. ^ , 
We thus have an unusually large number of species, when it is remembered 
that the vastly thicker Chemung group in New York has not furnished a single 
species. (We 'have found a poorly preserved Lingula in Chautauqua Co., how- 
ever.) 
A". Arthropomata. 
Valves thick, unlike, with hinge-teeth. 
I. Fam. Terebratulid^. 
Shell puctuate under a lense, more or less ovoid, smooth or 
striate, with a circular perforation of the the beak of ventral valve. 
Dorsal valve with an internal loop. Genera Terehratula^ Cryp- 
tonella, Centronella only distinguishable by internal characters. 
II. Fam. Rhynchonellid^. 
Shell not punctate, more or less triangular in outline and longi- 
tudinally plated, beak with a foramen. 
Genus Rhynchonella^ characters of the family. 
III. Fam. Atrypid.^. 
Shell fibrous, beak with no area, not strongly plaited. 
Genus Atrypa with radiating irregular striae. 
IV. Fam Spiriferid^e. 
Form various, usually with strong radiating plicse, and extend- 
ed hinge line. Internally dorsal valve with calcareous coiled arm 
supports. 
