34 
BELACHII. 
Genus ECHINORHINUS, Blainville. 
[Faune frangaise — Poissons, 1828, p. 60.] 
Syn. Goniodus, L. Agassiz, Poiss. Foss. Tol. iii. 1838, p. 04. 
Dorsal fins very small, without spine, the first opposite to the 
pelvics. Tooth equal in both jaws, very oblique, the point being 
turned outwards, and having one, two, or three strong horizontally 
directed dentieulations on each side. Skin with scattered largo 
round tubercles. 
An extinct species {E. ricliiardii) is founded by K. Lawley (op- 
cit. 1876, p. 41, pi. i. fig. 8, pi. ii. fig. 0) upon teeth and dermal 
tubercles from the Pliocene of Orciano aud Volterra, Tuscany. 
An indeterminable fragment of a fish apparently referable to the 
Spinacidas, from the Upper Cretaceous of Pictraroja, Naples, has 
been described under the name of Centroptei-us lividm by 0. G. 
Costa, Paleont. Regno Napoli, pt. iii. (1857-63), p. 123, pi. xii. 
fig. 13. The unsatisfactory nature of the specimen has already 
been commented upon by F. Bassani, Donkschr. math.-naturw. Cl. 
kais. Akad. Wiss. Wien, vol. xlv. (1882), pt. ii. p. 37. 
Family PETALODONTID^. 
Body moderately depressed; pectoral fins largo, continued for- 
wards towards the head. Teeth compressed antero-posteriorly, with 
root often relatively large ; crown more or less bent backwards, 
either with a sharp cutting-edge, or very obtuse. When arranged 
in the mouth the teeth form a close pavement. 
The genus Janassa affords the most complete insight into the 
characters of this famil)', the other genera, associated with it on 
account of the form of their teeth, being only known by these 
detached fragmentary fossils. 
Genus JABJASSA, MUnster. 
[Bcitr. Petrefakt. Heft i. 1832, p. 67.] 
Syn. Eictea, G. Jliinster, Beitr. Petrefakt. iii. 1840, p. 124. 
llyzenos, G. Munster, Beitr. Petrefakt. vi. 184.3, p. 60. 
CKmaxodus, F. McCoy, Ann. & Mag. Nat. Hist. [2] vol. ii. 1848, 
p. 128. 
Pdtodvs, J. S. Newberry & A. H. Worthen, Pal. llHnois, vol. iv. 
1870, p. 302. 
TanavduK, O. St. John & A. II. Worthen, Pal. Illinois, vol. vi. 
1876, p. 367. 
Striyilina, E. D. Cope, Proc. Anier. Phil. Soc. vol. xvii. 1876, p. 62. 
