﻿PALJEONISCIDJE. 5 ] 5 



Genus MYRIOLEPIS, Egerfcon. 



[Quart. Journ. Geol. Soc. vol. xx. 1864, p. 3.] 



Trunk fusiform, but robust. Head large, suspensoriura oblique 

 and gape wide ; dentition comprising a series of large, well-spaced 

 laniaries. Fins well developed, with small fulcra, the rays branch- 

 ing distally and all [except possibly the anterior rays of the pec- 

 toral fin] closely articulated. Pectoral fins relatively large ; dorsal 

 and anal fins high and triangular, the former opposed to the space 

 between the pelvic pair and the anal ; caudal fin deeply cleft, equi- 

 lobate. Scales very small, obliquely striated, enlarged upon the 

 sides of the upper caudal lobe ; ridge-scales of upper caudal lobe 

 prominent. 



Myriolepis clarkei, Egerton. 



1864. Myriolepis clarkei, Sir P. Egerton, Quart. Journ. Geol. Soc. 



vol. xx. p. 3, pi. i. fig. 1. 

 1890. Myriolepis clarkei, A. S. Woodward, Mem. Geol. Surv. N. S. 



Wales, Paheont. no. 4, p. 8, pi. ii. figs. 3, 4, pi. iii. fig. 1. 



Type. Imperfect fishes, wanting tail ; destroyed by accidental 

 fire, Museum of Geol. Survey, N. S. Wales. 



The type species, attaining a length of about 0'45. Maximum 

 depth of trunk nearly equal to the length of the head with opercular 

 apparatus, and contained about five times in the total length. Pelvic 

 fins half as large as the pectoral pair, situated midway between the 

 latter and the anal ; dorsal fin somewhat longer than deep ; anal 

 fin smaller than the latter, but equally elevated. Scales extremely 

 small, those of the flank in an individual 0435 in length not 

 measuring more than 0-0015 in depth and breadth. 



Form. § Log. Hawkesbury Beds (Upper Trias) : ¥ ew South 

 Wales. 



Not represented in the Collection. 



A shorter and stouter species of Myriolepis, with relatively larger 

 scales, also from the Hawkesbury Beds, is named M. lata, A. S. 

 Woodward, op. cit. p. 10, pi. iii. figs. 2, 3. The type specimen is in 

 the Museum of the Geol. Survey of N. S. Wales, Sydney, and there 

 are no examples in the British Museum Collection. 



In this genus, perhaps, may also be placed the so-called Palceo- 

 niscus antipocleus, Sir P. Egerton, Quart. Journ. Geol. Soc. vol. xx. 

 (1864), p. 4, pi. i. fig. 4, and woodc. An imperfect specimen appa- 

 rently referable to M. clarkei has lately been noticed under the 

 same name by O. Eeistmantel, Mem. Geol. Surv. N". S. Wales, 

 Palaeont. no. 3 (1890), p. 72, pi. xxx. fig. 1. 



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