114 ICHTHYOPTEKYGIA. 



Ichthyosaurus planartus, Theodori \ Up. Lias, Bavaria. 

 „ jpolaris, Hulke 2 . Trias (?), Spitsbergen. 



„ rheticus, Sauvage 3 . Up. Trias, France. 



(?) =Miocosaurus. 

 „ tnscissus, Quenstedt 4 . Up. Lias, Wiirtemberg. 



The name /. latimanus, as noticed above, mnst be discarded. 

 The names /. bonneyi, I. doughty i, and /. platymerus, Seeley, and 

 /. advenus, Phillips, are merely MS. ones ; the first three being- 

 applied to specimens from the Cambridge Greensand, and the fourth 

 to vertebrae from the Stonesfield Slate. /. walkcri, Seeley, has been 

 made the type of Cetarthrosaurus {vide supra, Pt. I. p. 270). 



Genus MIXOSAURUS, Baur 5 . 



Humerus and femur articulating distally with two bones ; radius 

 and ulna much longer than broad, and separated from one another 

 by an interval throughout their length. 



This genus, which is at present unrepresented in the Museum, is 

 founded upon Ichthyosaurus cornalianus, Basani 6 , from the Trias of 

 Italy ; but it may prove that the other Triassic forms are likewise 

 referable to it. In the type species the teeth are small and less 

 numerous than is usually the case in Ichthyosaurus. The founder 

 of the genus refers it to a distinct family. 



COPEOLITES OF ICHTHYOPTERYGIANS AND SAUKOPTERYGIANS. 



a. From the Lower Lias. 

 (Unless stated to the contrary, from Lyme-Regis, Dorsetshire.) 



28716. A large and somewhat imperfect specimen. Purchased, 1853. 



33284. A large specimen with one side weathered. Traces of fish-scales are 

 visible. Purchased, 1858. 



It. 1275. Part of a very large specimen. 



Harford Collection. Purchased, 1888. 



24769. A large weathered specimen, with one side ground down. Numerous 

 fragments of fish-scales are shown. Purchased, 1849. 



24769 a. Part of a large specimen. Purchased, 1849. 



24769 b. Fragment of a large specimen. Purchased, 1849. 



1 Beschreib. d. Ichthyosaurus trigonodon, p. 57 (1854). 



2 Bihang K. Sevenst Vet.-Akad. Handl. vol. i. no. 9, p. 3 (1873). 



3 Ann. Sci. Geo!, vol. vii. art. 6 (1876). 



4 Die Jura, p. 218 (1858). 



5 Amer. Nat. vol. xxi. p. 840 (1887). See also Bericht xxth Versamml. 

 Oberrhein. geol. Ver. p. 20 (1887). 



6 Atti Soc. Itah.Sci. Nat. vol. xxix. p. 20 (1880). 



