HOLOPTYCHIIDiE. 327 
Holoptychius flemingi, Agassiz. 
[Plate XI. figs. 1 a-dj\ 
1844. Holoptychius Jlemingii, L. Agassiz, Poiss. Foss. V. G. R. p. 71, 
pi. xxii. fig. 1 ( non p. 140, pi. xxxi. a. fig. 25). 
1844. Holoptychius andersoni , L. Agassiz, ibid. p. 72, pi. xxii. fig. 3. 
[British Museum.] 
1844. Platygnathus jamesoni, L. Agassiz, ibid. pp. 61,77, pi. xxv. [Tail; 
British Museum. 1 
1855. Holoptychius andersoni , F. M‘Coy, Brit. Palseoz. Foss. p. 594. 
1859. Holoptychius andersoni and H. Jlemingii, J. Anderson, Dura Den, 
p. 57, pi. i. fig. 3, pi. vii., pi. viii. figs. 1, 2. 
1859. Platygnathus jamesoni, J. Anderson, ibid. p. 56, pi. i. fig’. 2. 
1863. Holoptychius Jlemingii, R. AY alter, Ann. Mag. Nat. Hist. [3] 
yol. xi. p. 73, pi. ii. (lettered Glyptolepis ), woodc. figs. 1-4. 
1863. Glyptolepis Jlemingii, H. Mitchell, Geologist, vol. vi. p. 43. 
1863. Glyptolepis Jlemingii, J. Powrie, Geologist, yol. vi. p. 96. 
1861. Glyptopomus, T. H. Huxley ( errore ), Figs, and Descrips. Brit. 
Organic Remains (Mem. Geol. Surv.), dec. x. p. 4, woodc. fig. 4. 
1866. Glyptopomus, T. H. Huxley {errore), ibid. dec. xii. yl. i. fig. 2. 
1888. Holoptychius Jlemingii, M. Lohest, Ann. Soc. Geol. Belg. vol. xv. 
p. 143, pi. iii. figs. 2, 4, pi. vi. fig. 1. 
1888. Holoptychius Jlemingii, R. H. Traquair, Geol. Mag. [3] vol. v. 
p. 513. 
1890. Holoptychius femingi, Woodward & Sherborn, Cat. Brit. Foss. 
Vertebrata, p. 96. 
1890. Holoptychius Jlemingii, R. H. Traquair, Proc. Roy. Soc. Edinb. 
vol. xvii. p. 388. 
Type. Group of scales. 
A species somewhat smaller than the type. Head and opercular 
apparatus occupying nearly one-fifth of the total length ; first dorsal 
fin relatively small; second dorsal fin partly opposed to the space 
between the anal and the caudal. Scales externally ornamented 
with well-spaced delicate antero-posterior ridges, often bifurcating 
and sometimes anastomosing anteriorly; the ridges not interrupted, 
except rarely upon the ventral aspect of the abdominal region, but 
often continued upon the overlapped portion of the scale bj shoit, 
delicate, radiating lines of inconspicuous tubercles. 
Form. Sf Log. Upper Old Red Sandstone: Dura Den, Fifeshire. 
Upper Devonian: Chevremont and Strud, Belgium. ,*V/V, ev.hr. 
26117 b. Skull, mandible, and portion of the branchiostegal ap¬ 
paratus, ascribed to Glyptopomus by Huxley, loc. cit. ; 
Dura Den. The woodcut, exhibiting the upper aspect 
one-half the natural size, is reproduced in the accompany¬ 
ing fig. 49. Posteriorly is a broken median element 
