158 
The American Geologist. 
March, 1896 
gangue and in many different formations. It has not been 
demonstrated that the silver ores are superficial. In the 
Modock mines the best ore is said to have been obtained at a 
depth of 1,150 feet. The great body of ore at Cerro Gordo has 
apparently been worked out but the exploration is said not to 
have been thorough. 
NOTE ON THE DISCOVERY OF A SESSILE 
CON U LARI A.— ARTICLE I. 
By R. Ruedemann, Dolgeville, N. Y. 
(Plates VIII and IX.) 
In collecting, in a layer of the lower Utica shale, problem¬ 
atic filiform fossils to which Prof. J. M. Clarke had directed 
the writer’s attention, a Conularia was found to which are 
attached several smaller cuneiform fossils by organs which 
at first sight appear like rings. A thorough search in the 
locality has furnished four more specimens of Conularia 
which bear such appendages; also a few impressions of shells 
of Trochonema to which were attached in one case a single in¬ 
dividual of the supposed Conularia (pi. IX, fig. 1), and in 
another case many, but mostly poorly preserved, remains of 
Conularia ; also the ever present Diplograptus foliaceus 
Murch. sp., and the above mentioned problematicum , which 
will be described later. 
That the Conularia , their cuneiform appendages and the 
similar larger bodies attached to shells of Trochonema belong 
together, is a supposition for w T hich this note is intended to 
submit the arguments. 
The Conularia to which the supposed young are attached 
(pi. VIII, fig. 1, in which the interior cast of the shell is partly 
seen), as well as those found without the young in the same 
layer, compare best with Conularia gracilis Ha-11.* This form 
was described from the shaly upper part of the Trenton lime¬ 
stone near Middleville, N. Y., while the specimens of the 
waiter’s collection were found in the lowest Utica shale. 
One specimen (pi. IX, fig. 5) has been figured on account 
of its remarkably well preserved ornamentation and the 
structure of the angular grooves. It expands more rapidly 
than the others, the average angle of which is only 12°. A 
*Pal. of New York, vol. i, p. 224, pi. lix, fig. 5, 1847. 
