OCR Text |
Show 1904.] OSTEOLOGY OF THE ELOPID/E AND ALBULID/E. 81 mainly indebted to Hyrtl (Denkschr. Akad. Wiss. Wien, x. 1855, pp. 47-57, and xxi. 1863, pp. 1-10). The epibranchial organ is by no means confined to these fishes, but occurs, in one form or another, in Ilyodon, in Heterotis (Hyrtl, Denkschr. Akad.. Wiss. Wien, viii. 1854, pp. 73-88), in certain Characinoid fishes (Hyrtl, Denkschr. Akad. Wiss. Wien, xxi. 1863; Kner, Yerh. zool.-bot. Ges. Wien, xi. 1861, pp. 189- 192 ; Sagemehl, Morph. Jahrb. x. 1885, p. 114), in Osphromenus, Anabas, &c. (Cuv. et Yal., Hist. Nat. Poiss. vii. 1831, p. 328 and pi. 206 ; Peters, Mull. Arch. Anat. Phys. 1853, pp. 427-430), and probably in several other forms not related to the above-named genera. In the last instances given, the whole of the epibranchial and pharyngobranchial skeleton is modified, while the fifth cerato-branchials remain unaltered. Abbreviations employed in the Figures. al, alisphenoid. an, angular. bb, dentigerous plate covering mpt, metapterygoid. mx, maxilla. enar, endosteal articular. ecar, ectosteal articular. bo, basioccipital. hr, branchiostegal rays. bs, basisphenoid. cb, ceratobranchial. eh, ceratohyal. cor, circumorbital bones. ct, cartilage. d, dentary. eb, epibranchial. ecp, ectopterygoid. eh, epihyal. the basibranchials. n, nasal. op, opisthotic. opc, opercular. or, orbitosphenoid. p, parietal. pb, pharyngobranchial. pi, palatine. pm, premaxilla. pof, postfrontal. pop, preopercular. prf, prefrontal. pro, pro-otic. ps, parasphenoid. pt, post-temporal. p t f posterior temporal fossa. q, quadrate. sar, sesamoid articular. sm, surmaxilla. soc, supraoccipital. sop, subopercular. sp, spicular bone. sq, squamosal. st, supratemporal. stf, subtemporal fossa. sy, symplectic. enp, entopterygoid. eo, exoccipital. ep, epiotic. f frontal. flh, glossohyal. lib, hypobranchial. hh, hypohyal. hm, hyomandibular. ih, interhyal. iop, interopercular. me, mesethmoid. v, vomer. P roc. Z ool. Soc.-1904, V ol. II. No. VI. 6 |