. The fishes of North and Middle America [microform] : a descriptive catalogue of the species of fish-like vertebrates found in the waters of North America, north of the Isthmus of Panama. Fishes; Fishes; Poissons; Poissons. Jordan and Evermann.—Fishes of North America. 345 of tbom are specially inudifled. The tail iti isocercal; that is, with the ciindal vertebrro remainiug in a straight line to its extremity, as in the (Mub'.yos of most fish, and in the Anacanihini. We begin our discussion of the ook* Tvith the forms which seem nearest to the primitive stock from which the members of the gro
. The fishes of North and Middle America [microform] : a descriptive catalogue of the species of fish-like vertebrates found in the waters of North America, north of the Isthmus of Panama. Fishes; Fishes; Poissons; Poissons. Jordan and Evermann.—Fishes of North America. 345 of tbom are specially inudifled. The tail iti isocercal; that is, with the ciindal vertebrro remainiug in a straight line to its extremity, as in the (Mub'.yos of most fish, and in the Anacanihini. We begin our discussion of the ook* Tvith the forms which seem nearest to the primitive stock from which the members of the group have descended. II is evident that among the eels, the forms of simplest structure, as TJro- ptrrygius, Channomurwna, and Sphagebranchua are not in any sense primitive forms, but the results of a long continued and progressive degeneration, 80 far as the flns and mouth parts are concerned. The Apodes are proba- bly descended from laoapondylous or Iniomous types, possibly from ances- tors of the Anacanthini, and their divergence from typical forms is, in most respects, a retrogression.* (a, without; troif, foot, from the absence of ventral flns.) (i1/iif(rtiid«p, GOntiieh, Cat., viii, 10-146, 1870.) Families of Apodes. Enchklycepham : <i. Gill openings well devolopod, loading to large interbranchial slits; tongue present; operclee and brancliial bones well developed ; scapular arch present. b. Skin covered with rudimentary embedded scalos, usually linear in form, arranged in small groups, and ]ilaced obliquely at right angles to those of neighboring groups; pectorals and vertical flns well developed, the latter cotifluont about the tail; lateral lino present; posterior nostril in front of eyes ; tongue with its margins free, e. Gill openings well soparatcd ; branchiostegnls long, bent upwards behind. d. Gill openings lateral and vortical; snout conic, the jaws not very heavy ; gape longitudinal; lips thick; lower jaw projecting; teeth in cardifornt bands on jaws and vom
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectfishes, bookyear1896
