CEPHALOPODA. 
469 
This species has no analogous forms in the New York formations. It may 
be compared with Goniatites tuberculoso-costatus, d’A. and de V., as illustrated by 
the Doctors Sandberger in Versiein. des Rhein. Schiehtensystems in Nassau, pi. 1, 
fig. 1; pi. 8, fig. 2. 
Formation and locality. In the Chemung group, near Owego, N. Y. 
Goniatites Chemungensis, var. equicostatus. 
PLATE LXIX, FIG 10. 
Goniatites Chemungensis, var. equicostatus , Hall. Descriptions of New Species of Goniatidae, p. 3. 1S74. 
“ “ “ " “ Twenty-seventh Rep. State Mas. Nat. Hist., p. 135. 1875- 
“ “ “ “ “ Illustrations of Devonian Fossils: Cephalopoda, pi. 69, 
fig. 10. 1876. 
This variety was indicated chiefly on account of the uninterrupted and more 
prominent annulations crossing the volutions, which are more closely arranged, 
being about as four or five to three in the typical specimen. The exterior 
volution is more slender, and there is a ridge or carina extending along the 
middle of the lateral face, connecting the annulations. 
The umbilicus is wide, but. the inner volutions are not preserved. The septa 
and suture-lines are very imperfectly preserved, and it is only possible to say 
that the septa describe numerous small lobes and saddles which are similar to 
thos'e of the typical form, but which cannot be described in detail owing to the 
imperfection of the specimen. 
Surface-markings undetermined. 
Formation and locality. The specimen was found in a bowlder of arenaceous 
shale containing several species of Brachiopoda, which indicate its origin to be 
from the lower beds of the Chemung group. 
The following species are from the Goniatite limestone of Rockford, Indiana; 
and having been originally described in the Thirteenth Report on the N. Y. State 
Cabinet of Natural History, in 1860, are here introduced for comparison with 
those of the New York formations: 
