486 Mr. A. S. Woodward on 



single pair of transversely elongated supratemporals. These 

 elements are ornamented with rugae and tubercles of enamel, 

 as in Lophiostomus from the English Chalk. One fragment 

 of jaw, possibly maxilla, bears traces of small, slender, 

 conical teeth ; while among other remains in the region of 

 the mouth there are also scattered numerous small blunt 

 teeth, some distinctly cupped at the apex. Below the head 

 there are a few very slender branchiostegal rays. The 

 internal skeleton of the trunk is not observable, and the fins 

 are not remarkably well preserved. The pectoral fins comprise 

 each at least 15 stout rays, and seem to have been as large as 

 represented by Pictet ; but no fulcra can be distinguished on 

 their anterior border. The pelvic fins, each with 8 or 9 

 stout rays, are fringed with fulcra, which rapidly decrease in 

 size distally. The dorsal fin is observed to be much elevated 

 in front, without fulcra; but it is imperfectly preserved, and 

 the number of its rays is uncertain. There is no trace of an 

 anal fin. The caudal fin seems to have been forked, and its 

 upper lobe is fringed with large fulcra, which are erroneously 

 represented as a bifurcating bundle in Pictet's figure. Fulcra 

 seem to have been absent on the lower lobe of the tail. The 

 squamation, so far as distinguishable, is regular. The few 

 scales preserved exhibit a smooth enamelled external face, 

 while those near the dorsal and ventral borders of the fish 

 are clearly much narrowed. 



It thus seems probable that Petalopteryx is an Amioid 

 ganoid of the family Macrosemiidse, as already maintained in 

 the British Museum ' Catalogue of Fossil Fishes ' (part iii. 

 1895, p. 181). Among new points to be added to the generic 

 diagnosis may be mentioned the presence of stout crushing- 

 teeth within the mouth and of well-developed fulcra on the 

 pelvic fins. It now remains to discover new specimens of 

 Aphanepygus from the Cretaceous of Dalmatia, a genus 

 referred to the " Macrosemii " by Bassani * ; for it seems 

 likely that the features in which this fish appears to differ 

 generically from Petalopteryx will prove to be merely 

 imperfections in the unique type specimen. 



2. Coccodus armaius, Pictet, op. cit. p. 51, pi. ix. fig. 9. 



Though the Pycnodont genus Coccodus is now tolerably 

 well known from descriptions by Davis f and the present 

 writer J, the original figure by Pictet has always been 

 difficult to understand. An examination of the type specimen, 



* F. Bassani, " Descrizione dei Pesci Fossili di Lesina," Denksehr. k. 

 Akad. Wiss., matk.-naturw. CI. vol. xlv. (1882), p. 197, pi. i. figs. 1-9. 



t J. W. Davis, loc. cit. p. 546, pi. xxx. fig. 1 ; also Quart. Journ. Geol. 

 Soc. vol. xlvi. (1890), p. 505, pi. xxii. 



% Catal. Foss. Fishes Brit. Mus. pt. iii. (1895), p. 266, pi. xvi. fig. 4. 



