Catalogue of the fossil Reptilia and Amphibia in the British Museum (Natural history) ..By Richard Lydekker .. . ngby Theodori; and, so far as can be determined, the maxillaseems to enter the lower border of the nares. No history. Ichthyosaurus zetlandicus, Seeley \ Syn. Ichthyosaurus longifrons, Owen2. Cranial rostrum straight and of moderate length and thickness(fig. 28); supratemporal fossae (figs. 28, 29) long, large, and ap-proaching the form of an isosceles triangle ; fronto-nasal region longand narrow, with the median part of the nasals depressed and their 1 Quart. Journ. Geol. Soc. vol
Catalogue of the fossil Reptilia and Amphibia in the British Museum (Natural history) ..By Richard Lydekker .. . ngby Theodori; and, so far as can be determined, the maxillaseems to enter the lower border of the nares. No history. Ichthyosaurus zetlandicus, Seeley \ Syn. Ichthyosaurus longifrons, Owen2. Cranial rostrum straight and of moderate length and thickness(fig. 28); supratemporal fossae (figs. 28, 29) long, large, and ap-proaching the form of an isosceles triangle ; fronto-nasal region longand narrow, with the median part of the nasals depressed and their 1 Quart. Journ. Geol. Soc. vol. xxxvi. p, 635 (1880). 2 Liassic Reptilia (Mon. Pal. Soc), pt. iii. p. 118 (1881). ICHTHYOSAURUS. 77 lateral borders raised into prominent ridges in advance of the orbits;maxilla forming middle of inferior border of narial aperture. Neuralspines of dorsal vertebras of considerable height; vertebral centralong and moderately cupped. Pectoral paddle (comp. fig. 27) long,with anterior border of radius, radiale, and adjacent carpale in secondtransverse row notched; component bones relatively large but Fig. Ichthyosaurus zetlandicus.—Superior and right lateral aspects of the skull;from the Upper Lias of Normandy. Reduced. Pmx, premaxilla; Mx,maxilla; N, nares; Net, nasal; Fr, frontal; Prf, prefrontal; Ptf, post-frontal; Pa, parietal; J, jugal; QuJ, quadratoj ugal; Sq, squamosal;St, supratemporal; Por, postorbital; A, orbit; S, supratemporal fossa ;Scl, sclerotic; Md, mandible ; d, dentary ; op, splenial; ang, angular;k, articular. {After Zittel.) markedly polygonal, and the first longitudinal row of ulnar phalan-geals distinctly oblong, with their longer diameter transverse. Asmall fifth row of phalangeals probably present in some (fig. 30) elongated antero-posteriorly; scapula of thegeneral type of that of /. platyodon (infra, p. 101). The radius and ulna have no interval between them, and theformer articulates by a large surface with the intermedium. The onl
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