CniKOCENIRIDJS. 
91 
and impressed with a longitudinal groove. Paired fins with few 
much-expanded rays, the length of the pectoral rays not exceeding 
that of the head with opercular apparatus ; dorsal fin short, opposed 
to the anal, which is much extended and is elevated into a pointed 
lobe in front ; caudal fin deeply forked. Scales smooth. 
Chirocentrites coroninii, Heckel. 
1849-50. Chirocentrites coroninii, J. J. Heckel, loc. cit. p. 17, and 
Denkschr. k. Akad. Wiss., math.-uaturw. 01. vol. i. p. 203, pk xiii., 
pi. xiv. figs. 1, 2. 
1856. Chirocentrites coroninii, .1. J. Heckel, Denkschr. k. Akad. Wiss. 
math.-naturw. Cl. vol. xi. p. 243. 
1867. Chirocentrites coroninii, It. Kner, Sitzungsb. k. Akad. Wiss., 
math.-naturw. Cl. vol. lvi. pt. i. p. 189. 
1885. Chirocentrites coroninii, D. G. Kramberger, Rad Jugoslav. Akad. 
vol. lxxii. p. 28. 
Type. Nearly complete fish; Court Museum, Vienna. 
The type species, attaining a length of about 0'7. Length of 
head with opercular apparatus slightly exceeding its maximum 
depth, and contained about seven times in the total length of the 
fish ; maximum depth of trunk equalling nearly one quarter of its 
length from the pectoral arch to the base of the caudal fin. Sub- 
orbitals and preoperculum serrated on lower margin. Dentigerous 
border of maxilla sinuous, the teeth smaller than those of the 
dentary and prcmaxilla, but stout and largest on the convex portion. 
Vertebras about 35 in number in tho abdominal, 28 in the caudal 
region. Pelvic fins arising twice as far from the pectorals as from 
the anal ; dorsal fin with 15 rays, of which the foremost five are 
especially robust and adpressed, forming the anterior acumination ; 
anal flu with about 34 rays, of which the foremost five resemble 
those of the dorsal. 
Form. 4' Loc. Neocomian : Goriansk, Gorz, Istria. 
Not represented in the Collection. 
Like the so-called Chirocentrites microdon (Part III. p. 526), the 
following two species, which arc not represented in the Collection, 
may belong either to Chirocentrites or to Thrissops : — 
Chirocentrites gracilis, J. J. Heckel, Sitzungsb. k. Akad. Wiss., 
math.-naturw. Cl. 1849, pt. i. p. 18, and Denkschr. k. 
Akad. Wiss., math.-naturw. Cl. vol. i. (1850), p. 208, pi. xv. 
Thrissops gracilis , F. Bassani, Denkschr. k. Akad. Wiss., 
math.-naturw. Cl. vol. xlv. (1882), p. 257. — Cretaceous; 
Comen, Istria. 
