Catalogue of the fossil Reptilia and Amphibia in the British Museum (Natural history) ..By Richard Lydekker .. . vol. xxi. p. 837 (1887); and Bericht xx. Versamml. oberrhein. geol. 18 (1887). 2 Cope, Amer. Nat. vol. xix. p. 245 (1885), has proposed to place theIchthyopterygia in a division ranked as of equal value with that containing allthe other Reptiles. Seeley, Phillips Manual of Geology, 2nd ed. pt. 515-517, has proposed to affiliate this order with the Dinosauria. PART II. U •1Ihk Ivlll // 1/3 nv ///^2stt!lf iW / 1 A m\ iM mmx. ? i £*z fflSs: i IM V\\^v^»k j •^^^^ ^^~TIII
Catalogue of the fossil Reptilia and Amphibia in the British Museum (Natural history) ..By Richard Lydekker .. . vol. xxi. p. 837 (1887); and Bericht xx. Versamml. oberrhein. geol. 18 (1887). 2 Cope, Amer. Nat. vol. xix. p. 245 (1885), has proposed to place theIchthyopterygia in a division ranked as of equal value with that containing allthe other Reptiles. Seeley, Phillips Manual of Geology, 2nd ed. pt. 515-517, has proposed to affiliate this order with the Dinosauria. PART II. U •1Ihk Ivlll // 1/3 nv ///^2stt!lf iW / 1 A m\ iM mmx. ? i £*z fflSs: i IM V\\^v^»k j •^^^^ ^^~TIIIIWjgf/ gSg^ •£1; ~ **^S^. m sSiif UK •13!^ ^HS l=lf§w\ \A ^ ^mp Hi ^1/ h \/ ICHTHYOPTERYGIA. 3 Carnivorous Marine Reptiles with a Cetacean-like body (fig. 1),devoid of exoskeleton, and with the limbs modified into paddles, inwhich the proximal (propodial) segment is very short; the pha-langeals are ovoid or polygonal, and articulate together to form akind of pavement, the number in each digit being increased beyondthe normal, and frequently additional digits are developed. Skull Fig. Ichthyosaurus intermedius.—Left lateral view of skull; from the Lower Lias ofLyme-Regis. Reduced. Pmx, premaxilla ; Mx, maxilla; N, nares ; La,lachrymal; Prf, prefrontal; Fr, frontal; Pa, parietal; Pt, postfrontal;St, supratemporal; Sg, squamosal; Qj, quadratojugal; Qu, quadrate;Ju, jugal; PtO, postorbital. (After Huxley.) (fig. 2) large, with an elongated rostrum principally constituted in thecranium by the premaxilla; nares approximated to the large orbit,in which the sclerotic has an ossified ring ; a parietal foramen ;postorbital distinct from postfrontal, and lachrymal from prefrontal;frontal minute; quadrate fixed, not fused with pterygoid, andseparated from middle of quadratojugal by a foramen ; a columella(epipterygoid); a distinct opisthotic; two temporal arcades, con-nected together by the supratemporall, which roofs over theinfratemporal fossa. Teeth confined to the jaw
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Keywords: ., bookauthorlydekkerrichard184919, bookcentury1800, bookdecade1880
