466 Oeological Society. 



htstricah'Sy Moore, and pubescens, Warr. ; all the three white 

 spots more largely developed, the additional basal spot also 

 conspicuous ; the outer line, which in both of the above- 

 mentioned species forms a slight but visible projecting sinus 

 between the two outer spots, runs straight, and is followed by 

 an additional white blotch consisting of three coalescent 

 teeth. Hind wings whitish from base, becoming ochreous 

 fawn-colour towards hind margin, but not yellovvisii. The 

 fore wings have the apex more produced, subfalcate, and the 

 hind margin is slightly elbowed in the middle. 



Expanse of wings 24 millim. 



Several of both sexes from Tenimber and Dili. 



[To be contiinied.] 



PROCEEDINGS OF LEARNED SOCIETIES. 



GEOLOGICAL SOCIETY. 



February 26, 1896.— Dr. Henry Hicks, F.R.S., 

 President, in the Chair. 



The following communications were read :— 



1. ' On the Structure of the Plesiosaurian Skull.' By Charles W. 

 Andrews, Esq., B.Sc., F.G.S. 



Owing to the imperfection of the specimens described, various 

 previous accounts of the Plesiosaurian skull are incomplete, and 

 differ from one another in important particulars. There is 

 iu the National Collection a fine skull of Flesiosaurus macro- 

 cephalus which has lately been cleared from the matrix, with a 

 description of which the present communication is mainly occupied, 

 though other specimens, which are of assistance in clearing up some 

 difficulties, are also noticed. The Author particularly considers the 

 structure of the palate, and only such points in the structure of the 

 rest of the skull as add to or are at variance with previous descrip- 

 tions are considered. 



The Author's observations indicate that a general similarity of 

 palatal structure among reptiles does not necessarily imply any 

 close relationship, but the very great resemblances existing between 

 the Plesiosaurian and Rhynchocephalian palates, reinforced by 

 numerous other points of resemblance in these skeletons noted by 

 Baur, lead to the conclusion that the Plesiosauria are descended 

 from a primitive Rhynchocephalian reptile, as already opined by 

 Baur, Boulenger, and others. 



