﻿C(elacantiiidj:. 415 



Genus COCCODERMA, Quenstedt (emend. Reis). 

 [Der Jura, 1858, p. 810 (Kolchoderma).'] 



Supplementary caudal fin stout and prominent, the rays of all 

 the fins broad and robust, often expanded, and closely articulated 

 in the distal portion ; small granulations on the preaxial rays of 

 the first dorsal and caudal fins. External ornament consisting of 

 sparse tubercles, which become numerous and spinous on the scales ; 

 parafrontal and circumorbital bones plate-like, without superficial 

 excavations. 



This genus was founded upon a detached pterygo-suspensorial 

 bone, described as a problematical fossil by Quenstedt. The definition 

 here given is based upon the researches of 0. M. Reis (Paloeontogr. 

 vol. xxxv. 1888, p. 60), who recognizes three species, of which 

 there are no specimens in the Collection : — 



Coccoderma gigas, 0. M. Reis, loc. cit. (1888), p. 57, pi. iii. 

 fig. 17-19. — Lithographic Stone (Lower Kimmeridgian) ; 

 Bavaria. [Jaws ; Munich Museum.] 



Coccoderma substriolatum, 0. M. Reis, ibid. p. 51 : Macropoma 

 substriolatum, T. H. Huxley, Figs. & Descrips. Brit. 

 Organic Remains (Mem. Geol. Surv. 1866), dec. xii. 

 p. 39, pis. ix., x. — Kimmeridge Clay ; Cottenham. [Skull 

 and portion of trunk ; Woodwardian Museum, Cambridge.] 



Coccoderma suevicum, F. A. Quenstedt, Der Jura (1858), p. 810, 

 pi. 100. fig. 14 ; O.M. Reis, loc. cit. p. 51, pi. v. figs. 1,2, 

 4, 8, 11, pi. iv. fig. 16 : Undina major, A. Wagner, Abh. 

 math.-phys. CI. k.-bay. Akad. Wiss. vol. ix.(1863), p. 697 : 

 Coelacanihus major, R. von Willemoes-Suhm, Paloeontogr. 

 vol. xvii. (1869), p. 82. — Lithographic Stone (Lower 

 Kimmeridgian) ; Wiirtemberg and Bavaria. [Pterygo- 

 suspensorial bone ; Tubingen Museum. Type species.] 



Undefined fragments from the Bavarian Lithographic Stone are also 

 named Coccoderma nudum, Reis (loc. cit. p. 60, pi. iii. fig. 16, pi. v. 

 fig. 1), and C. bavaricum, Reis (ibid. p. 60, pi. v. fig. 2). The 

 types are in the Munich Museum. 



Genus HEPTANEMA, Bellotti. 



[C. Bellotti, in A. Stoppani, Studii Geol. e Paleont. Lombardia, 

 1857, p. 435.] 



Fin-rays robust and straight, not expanded, and only articulated 

 for a relatively short extent distally ; the preaxial rays of the first 

 dorsal and caudal fins with a double series of upwardly-pointed 



