Fig. 1. 
Fig. 2. 
Fig. 3. 
Fig. 4. 
Fig. 5. 
Fig. 6. 
Eastman. — Dinichthys. 
PLATE 2. 
Dinichthys terrelli Newb. X 4. Cleveland Shale; Lindale, Ohio. M. C. Z., 
Cat. No. 1379. Fragment showing internal surface of antero- and 
postero-dorso-lateral plates preserved in natural association with each 
other. Their union by pegs and sockets, the sinuous lateral boundary 
of the posterior plate, and the base of articulating condyle of the 
antero-dorso-lateral, are noteworthy features. 
Postero-ventro-median plate of an indetermined Dinichthyid species, from 
the Cleveland Shale of Lorain County, Ohio. X $ (approximately). 
M. C. Z., Cat. No. 1300. The external surface, shown here, bears im- 
pressions of overlapping plates, and is notched in front for reception 
of the antero-ventro-median. 
Dinichthys bohemicus (Barr.). X 2, Middle Devonian (Étage Gg"); 
Svagerka, Bohemia. M. C. Z., Cat. No. 1377. Tuberculated dorso- 
median plate. The posterior portion of the specimen, which was 
fractured obliquely downward, has been ground smooth and polished, 
so as to show the inferior carina in section. 
Dinichthys pelmensis sp. nov. X j. Middle Devonian ; Pelm, Eifel Dis- 
trict. M. C. Z., Cat. No. 1375. Dorso-median plate with perfectly 
preserved carinal process, and faint indications of sensory canals. 
Dinichthys terrelli Newb. X 4. Cleveland Shale; Lorain County, Ohio. 
M. C. Z., Cat. No. 1301. Antero-ventro-median plate, seen from the 
external surface. Thickness at posterior tip less than 2 mm. ; the 
plate has every indication of being entire, or very nearly so. 
Same specimen as shown in Fig. 5, viewed from the internal or visceral 
side. The thickened T-shaped ridge seen on this surface is very 
characteristic. 
