EASTMAN : THE DINICHTHYIDS. 37 



mens figured in the accompanying plates. That shown in Plate 3, Fig. 3, 

 represents without doubt the carinal process of a large dorsal shield, such as 

 could well have belonged to a species as large as D. eifeliensis. Two or three 

 additional specimens of the process, and several detached plates that are refer- 

 able to the same species, also form a part of the Schultze Collection. One 

 of these, identifiable as the right antero-ventro-lateral, is shown in Plate 5, 

 Fig. 4. 



Formation and Locality. — Middle Devonian; Gerolstein, Berndorf, and else- 

 where in the Eifel District. 



Dinichthys bohemicus (Barrande). 



Plate 2, Fig 3 ; Plate 5, Fig. 3. 



1872. Asterolepis bohemica, J. Barrande, Systeme Silurien de la Boheme, Vol. I. 

 Suppl., p. 637, Plate XXIX. Figs. 9-13. 



1880. Asterolepis bohemica, A. von Koenen, Abhandl. Ges. Wissensch. Gottingen, 

 Vol. XXX. p. 4. 



1895. Anomalichthys bohemicus, A. von Koenen, Abhandl. Ges. Wissensch. Got- 

 tingen, Vol. XL. pp. 8, 21. 



There can be no difficulty in recognizing the form commonly known as 

 Asterolepis bohemica Barr., since fossil fishes are not numerous in the Devonian 

 of Bohemia, and this one is distinguished by its peculiar ornamentation. The 

 tubercles are rather closely set, conical, and their summits, instead of being 

 smooth, are finely punctate. The plates are of relatively large size, and usu- 

 ally exhibit considerable convexity. 



There are two specimens of the dorso-median preserved in the Schary Col- 

 lection, now the property of the Museum of Comparative Zoology, besides the 

 impres-sion ot a third plate supposed to be one of the ventro-laterals. They 

 are all from the same horizon, and two are from the identical locality as 

 Barrande's type specimens. As has already been pointed out by von Koenen 

 (loc. cit., 1895, p. 8), it is extremely improbable that the figures ^ven by Bar- 

 rande are of the dorso-median. Their lack of bilateral symmetry, and their 

 relative thinness, compel us to locate them elsewhere, perhaps on the ventral 

 surface. 



Certain it is, however, that the specimens shown in the accompanying 

 figures represent the median dorsal plate. Not only do they fulfil the 

 requisite conditions of shape, symmetry, and thickness, but both of them 

 present fractures on the posterior end, where the carinal process has been 

 broken off, leaving a cross-section of the inferior longitudinal ridge. On the 

 strength of this evidence we are obliged to assign the species to Dinichthys. 

 One of the plates has the inferior ridge much more strongly deA'eloped than 

 the other, and differs considerably in form. But the ornamentation is essen- 

 tially the same, and we are content to refer them both to D. bohemicus, since 

 the coinage of new specific titles to include uncharacteristic fragments is 



