416 
CR0SS0PTERYGI1. 
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 :— 
Hept cinema par ado xum, 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 willemoesi , 0. M. Reis, Paleeontogr. 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 IVIACIIOPOIVIA, Agassiz. 
[Poiss. Foss., Feuilleton, 1835, p. 55.] 
Maxilla provided with irregularly-arranged large and small coni¬ 
cal teeth ; vomerine and pglatineTeeth 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 XIV. fig. 3.] 
1822. Amia? lewesiensis, G. A. Mantell, Foss. South Downs, p. 239, 
pis. xxxvii., xxxviii. 
1835. Macropoma mantellii, L. Agassiz, Poiss. Foss., Feuill. p. 55. 
