34 
SELACHII. 
Genus ECHINORHINUS, Blainville. 
[Faune frangaise—Poissons, 1828, p. 66.] 
Syn. Goniodus , L. Agassiz, Poiss. Foss. yoI. iii. 1838, p. 94^ 
/*s Jj ^rS. I» 7 f'S - 
Dorsal fins very small, without spine, the first opposite to the 
pelvics. Teeth equal in both jaws, very oblique, the point being 
turned outwards, and haying one, two, or three strong horizontally 
directed denticulations on each side. Skin with scattered large 
round tubercles. 
An extinct species (F. richiardii) is founded by It. Lawley (op. 
tit. 1876, p. 41, pi. i. fig. 8, pi. ii. fig. 6) upon teeth and dermal 
tubercles from the Pliocene of Orciano and Yolterra, Tuscany. 
An indeterminable fragment of a fish apparently referable to the 
Spinacidae, from the Upper Cretaceous of Pietraroja, Naples, has 
been described under the name of Centropterus lividus by 0. G. 
Cd h - Gosta, Paleont. Segno Napoli, pt. iii. (1857-63), p. 123, pi. xii. 
p^t****' irt'fig. 13. The unsatisfactory nature of the specimen has already 
been commented upon by F. Bassani, Denkschr. math.-naturw. Cl. 
kais. Akad. Wiss. Wien, vol. xly. (1882), pt. ii. p. 37. 
Family PETALODONTIDAE. 
Body moderately depressed; pectoral fins large, 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 yery 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 family, the other genera, associated with it on 
account of the form of their teeth, being only known by'-these 
detached fragmentary fossils. 
Genus Munster. 
[Beitr. Petrefakt. Heft i. 1832, p. 67.] 
Syn. Dictea, G. Miinster, Beitr. Petrefakt. iii. 1840, p. 124. 
Dyzenos , G. Miinster, Beitr. Petrefakt. vi. 1843, p. 50. 
Climaxodus . F. McCoy, Ann. & Mag. Nat. Hist. [2] vol. ii. 1848, 
p. 128. 
Deltodns , J. S. Newberry & A. H. Worthen, Pal. Illinois, vol. iv. 
1870, p. 362. 
1 Tanaodus , O. St. John & A. PI. Worthen, Pal. Illinois, vol. vi. 
1875, p. 367. 
Striyuina, E. D. Cope, Froc. Amer. Phil. Soc. vol. xvii. 1878, p. 52. 
