Notices of Memorrs. 373 
Numerous remains of the ordinary Upper Devonian fishes occur in 
the typical Old Red at the top of the series in association with fossil 
plants which have already been described by Professor A. G. Nathorst. 
Fragments of dermal armour of two new species of Psammosteus exhibit 
well the microscopical structure, of which fine illustrations are given. 
Dr. Kier also describes for the first time the microscopical structure 
of the plates of Drepanaspis, which he shows to be closely similar to 
that of Psammosteus. He agrees with Bashford Dean that the dorsal 
and ventral surfaces of Drepanaspis are wrongly identified by Traquair, 
the one being mistaken for the other. A Coccostean fragment and 
typical remains of Bothriolepis are described, and several large scales 
are referred to a new species of Holoptychius. Dendrodont and 
Rhizodont teeth alsooccur. The illustrative plates, by a photographic 
process, are especially beautiful. 
ITV.—On toe Generic Position oF ‘‘ ASTEROLEPIS ORNATA, VAR. 
AUSTRALIS”’, McCoy; wira Descrivprion or A New. Variety. 
By Frepprick Cuapmay, A.L.S. Proc. Roy. Soc. Victoria, n.s., 
vol. xxvill, pp. 211-15, pls. xx, xxi, 1916. 
\ R. CHAPMAN shows that the so-called Asterolepid fish from 
ivf the Devonian of Gippsland, Victoria, described in 1876 by 
McCoy, is really a Coccostean. A new specimen from the same 
locality seems to prove that it belongs to Phlyctenaspis or to a closely 
related genus. Other specimens represent a new variety in which 
the ornament is very dense, with smaller and more prominent 
tubercles. 
V.—Norice sur ta Nature vE w’Oreane Hexicorat pu HzLICOPRION. 
By A. Karpinsxy. Bull. Soc. Ouralienne Sci. Nat. Ekatérinebourg, 
vol. xxxv, pp. 117-45, pl. i, 1915. 
Hernicoprion Onerct, n.sp. By A. Karpinsxy. Bull. Acad. 
Inip. Sci. Petrograd, pp. 701-8, text-figs. 5, 1916. [In Russian. | 
R. KARPINSKY, who first described the remarkable spiral of 
Elasmobranch teeth, Helicoprion, from the Permo-Carboniferous 
of Russia in 1899, is still making valuable contributions to our 
knowledge of this fossil. He now describes new specimens from 
Krasnoufimsk, one of them not less than 350mm. in diameter. 
He refers to Hay’s discovery of Hdestus in direct association with the 
cartilages of the jaw, and concludes that there cannot any longer be 
doubt as to the true nature of Helicoprion. The inner part of one 
new spiral seems to have been broken during life, Dr. Karpinsky 
thinks through shock. The teeth in the new species, H. Clercz, are 
thicker than usual, and exhibit a slight crimping or plication at the 
base. They are therefore interesting for comparison with those of 
the new English species of Hdestus described by Dr. Smith Woodward 
at the last meeting of the Geological Society of London.’ 
1 See Reports and Proceedings Geol. Soc., infra, p. 381. 
