﻿416 CROSSOPTERYGl 1 . 



denticles ; [supplementary caudal fin " rudimentary or absent"]. 

 Operculum and jugular plates ornamented -with hollow spinous 

 tubercles ; the scales with a large median spinous tubercle flanked 

 by one or two pairs of similar but smaller tubercles. 



There are no examples of this genus in the Collection, but the 

 following species are recognized : — 



Heptanema paradoxum, C. Bellotti, in A. Stoppani, op. cit. 1857, 

 p. 435 ; W. Deecke, Palaeontogr. vol. xxxv. (1889), p. 112, 

 pi. vii. fig. 3. — Upper Keuper ; Perledo, Lake of Como. 

 [Imperfect fish ; Milan Museum. The type species.] 



Heptanema willenioesi, 0. M. Reis, Palaeontogr. vol. xxxv. (1888), 

 p. 64, pi. iii. figs. 20, 21 : Macropoma willemoesii, B. Vetter, 

 Mittheil. k. mineral.- geol. Mus. Dresden, pt. iv. (1881), p. 1, 

 pi. i. fig. 1. — Lower Kimmeridgian (Lithographic Stone) ; 

 Bavaria. [Royal Mineralogical Museum, Dresden.] 



An undetermined Coelacanth, possibly of this genus, from the 

 Keuper of Coburg, is also noticed and figured by H. A. C. Berger, 

 Verstein. Sandst. Coburg. Gegend (1832), p. 18, pi. i. fig. 2. 



Genus MACROPOMA, Agassiz. 

 [Poiss. Foss., Feuilleton, 1835, p. 55.'] 



Maxilla provided with irregularly-arranged large and small coni- 

 cal teeth ; vomerine and palatine teeth large and clustered ; pterygo- 

 suspensorium covered internally with granules, passing into small 

 conical teeth on the inferior margin of the bone ; splenial with small 

 conical teeth. The rays of all the fins robust and straight, not 

 expanded, and only articulated for a relatively short extent distally ; 

 a double series of small, upwardly -pointing denticles on almost all 

 the rays of the first dorsal and caudal fins ; [supplementary caudal 

 fin unknown]. Cranial roof-bones externally pitted and tubercu- 

 lated ; the other membrane-bones externally tuberculated, and the 

 scales ornamented with elongated prickles. 



The supplementary caudal fin in this genus is sometimes stated 

 to be rudimentary or absent ; but the condition of preservation of 

 known specimens does not as yet justify a definite assertion. 



Macropoma mantelli, Agassiz. 



[Plate XIY. fig. 3.] 



1822. Amia ? kioesiensis, G. A. Mantell, Foss. South Downs, p. 239, 



pis. xxx vii., xxxviii. 

 1835. Macropoma mantellii, L. Agassiz, Poiss. Foss., Feuill. p. 55. 



