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By Woodward H.
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And fins each form a and to the anterior pelvic [The pectoral pair, correspond respectively and posterior pairs of limbs of the higher Vertebrata. ] a, premaxillary ; ; ; ; ; For this reason the Teleostei are usually regarded as having their representatives in strata of Cretaceous age, and here are discovered numerous forms allied both to the highest and lowest divisions of the group. There are Acanthopterygian (spiny-finned) fishes, in which a certain number of the anterior rays of the dorsal, first and pelvic fins, have already become stiffened into spines, and which the pelvic fins have mostly advanced forwards to be and there are also innumerable placed beneath the pectorals examples of the more primitive division of the order, the Physostomi, which have so far retained the characters of their Ganoid ancestry as to possess abdominal pelvic fins, few or no spinous rays, and the margin of the upper jaw very frequently formed in part both by the maxilla and the premaxilla.
Acanthurus, 41. Acanus, 45. Aceutrophorus, 28. Acipenser, 24, 25, 26. Acipenseroidei, 24, 26, Acondylacanthus, Acrodus, 9, 11. Bracbyrbyncbus, 43. Brauchiostoma, 1. Bucklandium, 37. 6. Calaraoicbtbys, 21. Calamostoma, 45. Callipteryx, 40. Acrogaster, 43. Acrognatbus, 33. Acrolepis, 26. Acronuridte, 41. Aetobatis, 13. Amblypharyngodon, 37. Amblypterus, 26. Amia, 31. Amioidei, Capelin," 33, 34. Capitodus, 44. Carangida3, 41. Carangopsis, 41. Caranx, 41. Carcbarias, 7. Carcbariidae, 30, 31. Amphicentruni, 26.
Portions of Pvcnodonts. a, transverse section of jaws, showing the two halves of the mandibular dentition opposing the vomerine teeth; b, dentition of Microdon; c, dentition of Ccelodus; d, portion of vertebral column of Ccelodus, showing persistent noctochord (shaded), and the expanded bases of the arches; e, the same of Pycnodus /, inner view of scales, showing mode of interlocking by pegs and sockets, which are continued as longitudinal ribs. : Fio. — Upper dentition of Ccelodus ellipticus, Gault, Folkestone.