284 SATJKOPTERYGIA. 



Plesiosaurus posiclonice, Quenstedt l , of the Lias, may be identical 

 with one of the species mentioned above. 



Family LARIOSAURID.E. 



Skull short, with the pterygoids (where known) diverging poste- 

 riorly, and infraorbital vacuities on the palate. Yertebrae resembling 

 those of the next family. Pectoral girdle of the general type of the 

 latter, but, at least in the type genus, without a notch at glenoidal 

 extremity of the coracoid. Humerus somewhat shortened and ex- 

 panded, with or without distal foramen ; femur elongated, its length 

 exceeding that of propodials and metapodials collectively ; terminal 

 phalangeals with claws. 



The members of this family appear to connect the marine Plesio- 

 sauridce with the freshwater or terrestrial Nothosauridce. 



Genus LARIOSAURUS, Curioni 2 . 



The type genus. Under surface of skull unknown. Cervical ribs 

 present ; humerus without distal foramen ; epipodials moderately 

 long and thick ; phalangeals of pes short and thick. 



The type skeleton is figured by Curioni in the ' Mem. I. E. 1st. 

 Lombard.' vol. ix. pis. v.-vii. (1863) ; while a second imperfect 

 skeleton is figured by Deecke in the ' Zeitschr. deutsch. geol. Ges.' 

 vol. xxxiii. pis. iii., iv. (1886). 



Lariosaurus balsami, Curioni 3 . 



The type and only known species. Length of head and body to 

 root of tail about 0,445 (18 inches) ; length of skull about 0,089 

 (3*5 inches), of humerus 0,051 (2-0 inches). 



Sab. Europe (Italy). 



R. 1482. Cast of a slab showing the dorsal aspect of the entire 

 skeleton. The original was obtained from the Lower Trias 

 of Perleno, Como, Italy, and is preserved in the Museum 

 at Munich. It agrees precisely with the imperfect type 

 skeleton figured by Curioni in the i Mem. I. E. 1st. Lom- 

 bard.' vol. ix. pi. vi. (1863). The skull differs from those 

 figured of Conchiosaurus by Meyer by its shorter form and 

 the much shorter supratemporal fossae. 



Presented by Prof. K. von Zittel, 1889. 



1 Handbuch d. Petrefact. 2nd ed. p. 210 (1885). 



2 Gioru. I. R 1st. Lombard, vol. xvi. p. 166 (1847), vol. viii. p. 478 (1847). 



3 Loc. cit. 



