BEEYCID^. 
413 
1796. ClicBtodon, G. S. Volta, ihid. pi. Ixxii. fig. 1 (errore). 
1818. Holocentrus macrocephaluSj H. D. de Blainville, 2souv. Diet. 
d’Hist. Nat. vol. xxvii. p. 349. 
1818. ChcBtodon saxatilis^ H. D. de Blainville, ihid. p. 3o3 (errore). 
1834-36. Holoeentmm pygeeum, L. Agassiz, Poiss. Foss. vol. iv. pp. 6, 
107, pi. xiv. [Imperfect fish ; Carlsruhe Museum.] 
Type. Imperfect fish ; Paris Museum of Natural History. 
A species attaining a length of about 0*15. Length of head with 
opercular apparatus about equal to the maximum depth of the 
trunk and contained one and a half times in the length from the 
pectoral arch to the base of the caudal fin. Opercular apparatus 
conspicuously ornamented with irregular ridges and tubercles ; 
preopercular spine very short; upper opercular spine large and 
broad, lower spine comparatively insignificant. Dorsal fin with 11 
ribbed spines and 11 or 12 divided rays, the latter portion com¬ 
paratively deep but less than half as much extended as the former 
portion; anal fin with 4 ribbed spines and 8 or 9 divided rays, the 
fourth spine very slender, the stout third spine only feebly ribbed 
and as long as the longest dorsal spines, of which the length 
scarcely equals half the depth of the trunk at their insertion. 
Scales very delicately serrated. 
Form. Log. Upper Eocene : Monte Bolca, near Verona. 
P. 1925, P. 3981. Fine large specimen, in counterpart, labelled 
Bolocentrum pygmum by Agassiz, displaying the fins and 
the large opercular spine. Egerton Enniskillen Colls. 
P. 1925 a, P. 3981a. Smaller, more imperfect specimen, in counter¬ 
part. Egerton Enniskillen Colls. 
P. 1925 b-d. Three small specimens. Egerton Coll. 
P. 3981 b. Imperfect small specimen. Enniskillen Coll. 
.^V3p2Q3-Q4., ,Two more fragmentary small specimens, the second 
displaying the operculum chiefly in impression and a 
detached preoperculum. Purchased, 1861. 
Holocentrum melitense, A. S. Woodward. 
1887. Holocentrum melitense, A. S. Woodward, Geol. Mag. [3] vol. iv. 
p. 357. 
Type. Imperfect fish, wanting head ; British Museum. 
An imperfectly known species, attaining a length of about 0*35. 
Maximum depth of trunk contained somewhat less than one and a 
