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Bashford Dean Memorial Volume 



redrawing of Newberry's reconstruction with 

 the one difference that the above mentioned 

 plate, the post-maxillary, is here called hyo- 

 mandibular. 



Next, Claypole (1892.2) published a paper 

 on Dinichthys with a very good figure of its 

 head from outside and inside (Text'figure 2). 

 The limits between the single plates are cor- 

 rectly drawn, but he, like Newberry, has 

 divided the ''centraF' into two plates,"frontar' 

 and ''parietal.'' Claypole's section ot the head 

 is especially interesting since he correctly 

 shows the strong curving of the head shield. 



Dean, in his 'Tishes Living and Fossil" 



ADL, 

 dorsal; 



Text-figure 3. 

 Dean's reconstruction of Dinichthys 



intermedius Nwb. (1895). 

 antero-dorso-lateral; CI, clavicular; MD, median- 

 Md, mandible; Mx, maxilla; PrM, premaxilla; 

 SO, sub-3rbital. 



Text-figure 4. 

 Eastman's reconstruction of Dinichthys 

 intermedins Nwb. (1897)- 

 ADL, antero-dorso-lateral; e, ethmoid; eo, external- 

 occipital; /, frontal; M, marginal; MD, median-dorsal; 

 mo, middle -occipital; n, nasal; p, parietal; PDL, postero- 

 dorso-lateral; PrO, pre-orbital; PtO, post-orbital; SO, 

 sub-orbital. 



(1895) reproduces a photograph of the first 

 more complete reconstruction of Dinichthys 

 intermedius Nwb. (Text-figure 3). This re- 

 construction consists of the whole head shield 

 with sub-orbital and jaw elements and the 

 median-dorsal, antero-dorso-lateral and antero- 

 lateral of the body carapace. Because of im- 

 perfect knowledge of the osteology of Dnuch- 

 thys, this reconstruction shows many mistakes. 

 The head shield is not strongly enough curved. 

 The orbit openings are too large. All the 

 jaw elements, especially the mandibles, are 

 taken from larger examples than are the other 

 parts of the carapace. The maxilla is incor- 

 rectly placed in relation to the sub-orbital. 

 The median-dorsal, congruent with New- 

 berry's drawing, is set too far forward. The 

 contact between median-dorsal and antero- 

 dorso-lateral is too short and too weak. The 

 antero-dorso-lateral itself is placed too hori- 

 zontally. The antero-lateral, which also is 

 taken from larger specimens, touches the 

 antero-dorso-lateral from the underside. (As 

 know in reality the antero-lateral over- 



we 



