78 
BULLETIN OF THE LABORATORIES 
I. 
Brachiopoda. 
Leptsena prolongata. 
\ 
n. sp. 
11 . 
Strophomena patenta. 
Hall. 
III. 
— rhomboidalis. 
Wilckens. 
IV. 
Orthis biforata, var. lynx. f. reversata. 
V. 
— biforata, var. lynx. f. Daytonensis. 
VI. 
— flabella, .... 
Sowerby. 
VII. 
— hybrida. 
Sowerby. 
VIII. 
— elegantula, .... 
Dal man. 
IX. 
— elegantula, var. parva. 
n. var. 
X. 
— fausta, .... 
n. sp. 
XL 
— Daytonensis, 
n. sp. 
XIL 
Meristella umbonata, 
Billings. 
XIII. 
Triplesia Ortoni, 
Meek. 
XIV. 
triplesiana, .... 
. n. sp. 
XV. 
Rhynchonella scobina, . , 
Meek. 
XVI. 
Zygospira modesta. 
Hall. 
XVII. 
Atrypa nodostriata. 
Hall. 
XVIII. 
Eichwaldia reticulata. 
Hall. 
The Brachiopoda of the Clinton Group of Ohio seem to have their 
nearest relatives in the Niagara formations of other States. Eichwal- 
dia reticulata is characteristic of the Waldron beds of Indiana. Or- 
tJiis hybrida and O. elegantida are widely distributed Niagara forms. 
Orthis flabella and Atrypa 7iodostriata recall the Niagara fossils of New 
York. Rhynchojiella scobina is closely related to R. iieglecta, a Niagara 
fossil of considerable distribution. Leptcp.na prolongata recalls L. 
traasversalis of New York. Orthis fausta finds its nearest relative, 
perhaps, in O. JVisis, of Kentucky strata, equivalent to Niagara for- 
mations. Meristella umbonata is found in the Middle Silurian of An- 
ticosta. Strophomena pate^ita^ however, is found in New York, in 
rocks undoubtedly Clinton. Three species, Strophomena rhomboidalis, 
Orthis biforata var. lynx, and apparently also Zygospira 77iodesta extend 
from the Lower Silurian into the Clinton rocks of Ohio. 
Of these, St7'opho77ie7ia rho77iboidalis and 07ihis biforata, var. Iy7ix, 
have a great range vertically. Stropho77ie7ia pate7ita differs from the 
New York types of this species in the finer and more numerous radi- 
ating striae. ZygospRa 77iodesta, as stated, has its relations in lower 
strata. The testimony of the other fossils seems to be more or less 
decidedly in favor of a relationship with Niagara forms. 
