8C0MBRIM. 
465 
distinct. Immaturity is indicated by the radiating ridges 
and serrations on the preoperculum. Ennislcillen Coll. 
The following species have also been founded on imperfect fossils, 
but are not represented in the Collection : — 
Auxis croaticm, D. G. Kramberger, Beitr. Paliiont. Oesterr.- 
Ungarns, vol. ii. (1882), p. 121, pi. xxv. fig. 1.— Upper 
Miocene ; Radoboj, Croatia. [Imperfect fish ; University 
Geological Museum, Agram.] 
Auxis minor, I). G. Kramberger, loc.cit. 1882, p. 123, pi. xxiv. 
figs. 5, 6.— Ibid. [Imperfect trunk ; Imperial Geological 
Survey, Vienna.] 
Auxis stiriacus, D. G. Kramberger, Djela Jugoslav. Akad. vol. xvi. 
(1895), p. 64, pi. xi. fig. 4, pi. xii. fig. 2.— Oligocene ; 
St. Georgen, near Zilli, Croatia. [Imperfect fish ; Zilli 
Museum.] 
Auxis thynnoides, D. G. Kramberger, loc.cit. 1882, p. 125, 
pi. xxvi. figs. 1, 2. — Upper Miocene; Podsused, Croatia. 
[Imperfect trunk, in counterpart ; Imperial Geological 
Survey, Vienna, and University Geological Museum, 
Agram.] 
Auxis vrabceensis, D. G. Kramberger, loc.cit. 1882, p. 122, pi. xxiv. 
fig. 4. — Upper Miocene ; Vrabce, Croatia. [Imperfect 
trunk ; University Geological Museum, Agram.] 
Genus CYBIUM, Cuvier. 
[Itegne Animal, ed. 2, vol. ii. 1829, p. 199.] 
S yn. Scomberodon, P. J. Van Beneden, Bull. Acad. Roy. Belg. [2] 
vol. xx.xi. 1871, p. 504. 
Trunk elongate-fusiform ; the slender caudal pedicle with strong 
Median lateral keel formed by cartilaginous ridge on vertebral 
centra. Median pair of fossaj for anterior extension of lateral 
Muscles of trunk produced forwards over frontal bones and separated 
fiy median frontal ridge continuing the supraoccipital ridge. Teeth 
°n margin of jaws large, conical, and laterally compressed, with 
°Pposite sharp edges ; minute teeth on vomer and palatines ; gill- 
rakers few. Vertebral centra constricted, with two lateral pits 
separated by a longitudinal ridge ; all hsemal arches simple. 1 aired 
™ 8 small ; dorsal fins well separated, the anterior consisting of 
^ to 18 feeble spines ; posterior dorsal and anal fins small but 
elevated, similar and opposite, followed by 7 to 10 detached finlets ; 
caudal fin deeply forked, with slender lobes. Scales very small 
fart iv. 2 H 
