PALiEOXISCIDiE. 
511 
] 865. Gyrolepis tenuistriatus, H. 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. yoI. iii. 
pi. ii. fig. 18. 
(P) 1878. Gyrolepis albertii (?) and G. tenuistriatus , B. Lundgren, 
Minneskr. Kongl. Fysiogr. Sallsk. Lund, no. v. p. 33, pl.ii. figs. 62, 
65-67. 
1880. Amblypterus decipiens, T. C. Winkler, Arcbiv. Musee Teyler, 
vol. ii. p. 129, pi. Yiii. figs. 28-30. 
1888. Gyrolepis albertii , W. Dames, Pakeont. Abliandl. yoI. iv. p. 143, 
pi. xi. fig. 1, pi. xii. fig. 1, pi. xy. 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 waxy 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. Lamary 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, Joe. 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 KhaBtic formation are provisionally placed 
here, because they exhibit no distinctive features. 
Form. Sf Loc. Upper Muschelkalk : Germany and East France. 
Bhaetic : Wiirtemberg, South England, and North Ireland. 
p/ y /Ft&sycAi"i-SAct-CA. GLcryr'bp* 
1583 a. Scale in Muschelkalk, Laineck, near Bayreuth, Bavaria. 
Braun Coll. 
P. 6301. Small associated scales; Muschelkalk, Weimar. 
Presented by C. Westendarp, Fsep, 1884. 
