Notes on Cincinnatian and Lexington Fossils 323 
Clitambonites diversus — rogersensis, var. nov. 
\ {Plate VII, F'igs. 14, A, B.) 
This is an extremely variable species and it is difficult to deter- 
mine from the specimens at hand whether it is to be regarded as 
identical with Clitamhomtes diversus^ Shaler, or as new. The 
pedicel valves vary between forms which are quite symmetrical 
in shapCj and which appear to predominate, to others in which 
not only the beak is excentric, but the entire valve is more or less 
irregularly contorted. The area of this valve is broadly triangular 
and varies from 7 to 8 millimeters in height; it usually forms an 
angle of about 100 to 115 degrees with the plane of junction of 
the valves, but may be inclined forward so as to form an angle 
of 70 degrees. The brachial valve is flat, with a broad, shallow, 
median depression anteriorly. The most conspicuous feature 
of this valve is its great width, considering its length. Several 
specimens 24 millimeters wide had a length of only 14 or 15 milli- 
meters. In these specimens, the posterior adductor scars and 
the depressions between the cardinal process and the crural 
plates are considerably shorter from front to rear than in the 
Trenton specimens of Clitamhonites vernetitliy Billings. The 
anterior adductor impressions are distinctly indicated and either 
equal or exceed in size the posterior ones. The number of radiat- 
ing stri^ varies from 4 to 5 in a width of 3 millimeters. 
Geological position. In the lower part of the Eden formation 
at Rogers Gap and also north of Ford, a quarter of a mile before 
reaching the second tunnel, Kentucky, associated with Plector- 
this (Eridorthis) nicklesiy Plectorthis (Eridorthis) rogersensis^ and 
a Leptcena similar to that found at Boyd, Kentucky. 
Smaller specimens of Clitamhonites j apparently belonging to 
the same variety as the preceding, occur in the coarse-grained 
limestone quarried about a mile and a quarter west of Carlisle, 
and in contorted fine-grained argillaceous limestone exposed east 
of Carlisle, both before reaching the so-called Tunnel cut, along 
the railroad, and also at the exposures immediately beyond the 
cut. At the latter locality the following section is seen, described 
in descending order: 
Hard blue limestone layers, cross-bedded .4 ft. 
Hard limestone with a nodular base ............................... .2 ft. 3 in. 
Nodular argillaceous limestone with Clitamhonttes . . • • - 3 4 
