Mr. A. S. Woodward — Palceichthyological Notes. 2S7 



The genus as thus defined is evidently to be placed in the 

 group of Palasoniscidae comprising Acrolepis, Elonichthys^ 

 Gyrolepis^ and their allies *. 



Ganohpis gracilis, sp. n. (PI. X. figs. 7-9.) 



The type and only known species, of diminutive size, 

 apparently not exceeding 0"05 metre in length. Length of 

 head with opercular apparatus about equal to the maximum 

 depth of the trunk and one fourth of the total length of the 

 fish ; external ornament very conspicuous. Dorsal fin arising 

 slightly in advance of the middle point of the back and much 

 larger than the anal fin. Scales marked by fine parallel 

 horizontal or oblique ridges, terminating in serrations at the 

 hinder border and often flexed upwards in front parallel to 

 the anterior border. 



The least fragmentary and distorted specimen of this species 

 is shown of the natural size in fig. 7. It exhibits apparently 

 the original form of the trunk, the attenuated upper caudal 

 lobe, the thick squamation, t!ie prominent lateral line, and 

 parts of the median fins. The form, proportions, and orna- 

 ment of the maxilla are well seen in a detached specimen, 

 enlarged twice, in fig 8, and the characters of the scale- 

 ornament are indicated in fig. 9. 



EXPLANATION OF PLATE X. 



Fig. 1. Ceratodus kevissimics, Miall ; left upper tooth, oral aspect. Lower 

 Keuper, Coten End, Warwick. Collection of Rev. P. B. 

 lirodie, M.A., F.G.S., Rowington. 



Fig. 1 a. Ditto ; outer aspect of a " horn " or denticle. 



Figs. 2-4. Phcebodus Brodiei, sp. n. ; teeth in series from the anterior 

 aspect, twice nat. size (2), one imperfect tooth viewed from 

 above, twice nat. size (3), and restored tooth from the anterior 

 aspect, thrice nat. size (4). Upper Keuper, Shrewley, Warsvicif- 

 shire. Coll. of Rev. P. JB. Brodie. 



Fig.!), Hyhodont ^n-STpine {'^ Ilghodiis keKperinus, Murch. and Strickl."), 

 lateral aspect. Ibid. Coll. of Kev. P. B. Brodie. 



Fig. 5 a. Ditto; posterior view of extremity of spine. 



Figs. 5 1>, c. Ditto ; transverse sections of spine. 



Fig. G. NemacanlJuis moni/ifer, Ag. ; dorsal fin-spine, lateral aspect. 

 RhiBtic, Aust Clitfi British Museum, No. P. 28o4. 



Figs. 7-9. Ganolepis gracilis, gen. et sp. n. ; lateral view of fish (7), right 

 maxilla, twice nat. size (8), and scale of tlaiik, thrice nat. size (9). 

 Permian (':'), Medwiusko, near Atjinsk, Government of Jeuissei, 

 Liberia. Roy.il State Museum, Stockholm. 



Figs. 10- 12. Gyrulijns dubius, sp. n. ; internal impression of squamation 

 of flank (lOj, an imperfect scale (11), and purtiou of dorsal tin- 

 rays (12). Rhietic, Scania. Museum of Swedish Geological 

 Sur\ey, Sweden. 



[Unless otherwise stated, all the figures are of the natural size.] 

 * Cat. Foss. Fishes Brit. Mus. pt. ii. (1891) p. 42'.>. 



2:i* 



