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445 



An imperfectly known species of moderate size. Trunk robust ; 

 dorsal margin gently arched in advance of dorsal fin. Head-bones 

 marked with coarse vermiculating ridges; teeth of mandible in 

 regular close series, very slender. Dorsal fin arising opposite the 

 hinder portion of the pelvic pair. Scales relatively smaller and 

 thicker than those of A. decorus, scarcely deeper than broad on the 

 middle of the Hank, those of the anterior ventro -lateral region 

 feebly crenulated and serrated. 



Form. Sf Loc. Permian : Prussia. 



P. 3461. Type specimen, displaying the mandibular teeth ; Gold- 

 lauter. EnnisJcillen Coll. 



P. 3462. More imperfect, larger head and abdominal region ; Gold- 

 lauter. Ennishillen Coll. 



Amblypterus reussi (Heckel). 



18(31. Palcconiscus reussii, J. J. Heckel, Denkschr. k. Akad. Wiss., 



math.-naturw. CI. vol. xix. p. 61, pi. vii. 

 1877. Amblypterus reussii, R. H. Traquair, Quart. Joiirn. Geol. Soe. 



vol. xxxiii. p. 558. 



Type,. Nearly complete fish ; Eoyal Bohemian Museum, Prague. 



Trunk short and deep, the maximum depth in advance of the 

 dorsal fin contained about three and a half times in the total length. 

 Head and opercular apparatus occupying less than one quarter of 

 the total length ; external bones marked with fine striae and ruga?. 

 Pelvic fins well developed, inserted halfway between the pectorals 

 and the anal ; dorsal arising behind the middle of the back, high, 

 triangular, and short-based, directly opposed to the slightly smaller 

 anal. Scales large, those of the middle of the flank deeper than 

 broad ; all smooth, except two or three anterior series, which 

 exhibit delicate fiutings and crenulations at the free margin. 



Form. $ Loc. Lower Permian : Semil, Bohemia. 



Not represented in the Collection. 



Amblypterus blainvillei (Agassiz). 



1818. Palcsothrissum incequilobum, H. D. de Blainville, Nouv. Diet. 

 d'Hist. Nat. vol. xxvii. p. 321 (imperfectly defined). 



1818. Palceothrissum parviwi, H. D. de Blainville, ibid. p. 321 (imper- 

 fectly defined). 



1833. Palceoniscus blainvillei, L. Agassiz, Poiss. Foss. vol. ii. pt. i. pp. 4. 

 48, pi. v. 



