Fig. 1. 
Fig. 2. 
Fig. 3. 
Fig. 4. 
EASTMAN. — Dinichthys. 
PLATE 3. 
Dinichthys (2) intermedius Newb. X 3. Cleveland Shale ; Lindale, Ohio. 
M. C. Z., Cat. No. 1380. External aspect of supposed antero-ventro- 
median plate. 
Dinichthys terrelli Newb. X 1. Cleveland Shale ; Lorain County, Ohio. 
M. C. Z., Cat. No. 1815. Posterior aspect of carinal process belong- 
median, viewed in a vertical position. ‘The 
where it overrode the vertebral axis, its 
massive character, and depth of posterior cavity, are remarkable. It 
projects downward and backward at an angle of about 60° with the 
plane of the dorso-median, traced along the median line of the back. 
Dinichthys eifeliensis Kayser. X 1, Middle Devonian ; Berndorf, near 
Hillesheim, Eifel District. M. C. Z, Cat. No. 1874, Carinal process 
detached from dorso-median plate. 
Dinichthys pustulosus sp. NOV. X 1, Hamilton Limestone ; Cement Quar- 
ries, Milwaukee, Wisconsin. M. C. Z., Cat. No. 1881. Slightly 
abraded antero-dorso-lateral plate, showing single sensory canal, and 
relatively fine tuberculation. 
ing to a large-sized dorso- 
semicircular incision below, 
