﻿TALiEONISCID^:. 



511 



] 865. Gyrolepis tenuistriatus, II. Eck, Form. bunt. Sandst. u. Muschelk. 



Oberschlesien, p. 122. 

 1872. Gyrolepis maximus, H. Eck, Riidersdorf u. Umgegend, p. 114. 

 1872. Gyrolepis tenuistriatus, H. Eck, ibid. pp. 118, 121. 

 1872. Gyrolepis albertii, R. Etheridge, Proc. Cardiff Nat. Soc. vol. iii. 



pi. ii. fig. 18. 

 (?) 1878. Gyrolepis albertii (?) and G. tenuistriatus, B. Lundgren, 



Minneskr. Kongl. Fysiogr. Sallsk. Lund, no. v. p. 33, pi. ii. figs. 02, 



65-67. 

 1880. Amblypterus decipiens, T. C. Winkler, Archiv. Mus6e Teyler, 



vol. ii. p. 129, pl.viii. figs. 28-30. 



1888. Gyrolepis albertii, W. Dames, Palaeont. Abhandl. vol. iv. p. 143, 

 pi. xi. fig. 1, pi. xii. fig. 1, pi. xv. fig. 1. 



1889. Gyrolepis albertii, A. S. Woodward, Trans. Leicester Lit. & Phil. 

 Soc. n. s. pt. xi. p. 20. 



Type. Scales. 



The type species, of relatively large size, the head measuring not 

 less than 0*07 in length. Head as deep as broad, and the external 

 bones ornamented with delicate wavy striae, sometimes subdivided 

 into tuberculations, as upon the cranial roof and the anterior por- 

 tion of the maxilla ; striae of dentary bone obliquely directed down- 

 wards and forwards. Laniary teeth very long, slender, and acutely 

 pointed. Operculum about three times as deep as broad, marked 

 with delicate, horizontal, wavy striae and elongated tuberculations. 

 Scales with smooth posterior margin, ornamented with numerous 

 obliquely-directed delicate striae, often wavy, branching or anasto- 

 mosing, and in the larger anterior flank-scales subdivided into elon- 

 gated tubercles. 



The precise form and proportions of the trunk of this species are 

 as yet unknown, and, so far as Muschelkalk fossils are concerned, 

 the synonymy and definition given above are based upon the re- 

 searches of W. Dames, he. cit. (1888). The typical scales are 

 referable to the trunk proper ; the scales named G. maximus occur 

 in the first vertical series immediately behind the pectoral arch ; and 

 those termed G. tenuistriatus pertain to the upper caudal lobe. The 

 detached scales from the Rhaetic formation are provisionally placed 

 here, because they exhibit no distinctive features. 



Form. Sf Loc. Upper Muschelkalk : Germany and East France. 

 Rhaetic : Wiirtemberg, South England, and North Ireland. 



1583 a. Scale in Muschelkalk, Laineck, near Bayreuth, Bavaria. 



Braun Coll. 



P. 6301. Small associated scales; Muschelkalk, Weimar. 



Presented by C. Westendarjj, Esq., 1884. 



