. The Bashford Dean memorial volume : archaic fishes. Fishes; Sharks; Fishes, Fossil. 142 Bashford Dean Memorial Volume orbital impression. Stensio correctly let the sensory canal from PrO continue onto "L" and placed the nostril impressions between ""L" and the rostral. Jaekel mentioned this plate in many of his papers and figured it in all his reconstruc tions of Arthrodira from Wildungen (1902, , 1907, 1925). According to him, the P7s[ has a deep nostril impression or is even perforated by nostril openings. The sensory canal from PrO is continued on it. He cal
. The Bashford Dean memorial volume : archaic fishes. Fishes; Sharks; Fishes, Fossil. 142 Bashford Dean Memorial Volume orbital impression. Stensio correctly let the sensory canal from PrO continue onto "L" and placed the nostril impressions between ""L" and the rostral. Jaekel mentioned this plate in many of his papers and figured it in all his reconstruc tions of Arthrodira from Wildungen (1902, , 1907, 1925). According to him, the P7s[ has a deep nostril impression or is even perforated by nostril openings. The sensory canal from PrO is continued on it. He called it in 1902 ""Lacrymale'', later '; The first author to mention this plate in Dinichthys was Claypole. In his paper on Dimchthys in 1892 (p. 206) he described it briefly, and promised to describe it in detail in a later article, but I have not been able to find this description in any of his papers. In all probability it was never done. Here follows his brief description: The pre-maxillary [post-nasal], which has been hitherto unknown, is not found in the specimen here described, but its presence has been established from others. . For the present it must suffice to say, that it com- pleted the outline of the fore part of the head, enclosing the nasal openings and filling up the recess observable between the nasal and pre- orbital plates. The next author was Branson (, .2, 1911), who described the post'nasal as a fore part of the sub-orbital and was of the opinion (, p. 364) that: "The notched anterior end of it (SO) has not been figured or described. ... In the interior of the notch the bone is 15 mm. thick and apparently artic- ulated with some other bone. The anterior slimc'canal seems to be continuous with the anterior slime-canal of the top of the ; In the collections of the American Museum, P^i is to be found as a badly preserved specimen and as a plaster cast. The cast is of a big SO, probably of Dinichthys terrell
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