120 MR. A. G. BUTLER ON [Feb. 16, 



In the brain the chief differences from T. niger were : the greater 

 depth in proportion to the length ; the Sylvian fissure was much more 

 upright than in the common Chimpanzee, and therefore approached 

 the Gorilla and the other Anthropoids ; the common Chimpanzee 

 came nearest to man in the direction of this fissure. The middle lobe 

 of the cerebellum was overlapped posteriorly, and nearly concealed, 

 by the two lateral lobes. 



The Orang " George" was believed on its arrival to be an adult 

 example of the Lesser Orang, Simia morio, originally described by 

 Sir R. Owen. It proved to be a much younger specimen than had 

 been supposed. All the milk-teeth were present ; and, although 

 they were unusually worn, none had been replaced by the permanent 

 teeth. The shape of the head was, however, rather different from 

 that of the typical Simla satyrus, being distinctly longer and not so 

 markedly brachycephalic. 



The external characters, particularly the hands and feet, were 

 described and illustrated, and a full account was given of the muscular 

 anatomy of the limbs. 



This paper will be published entire in the Society's ' Transactions.' 



The following papers were read : — 



1. On a Collection of Lepidoptera from Sandakan_, N.E. 

 Borneo. By Arthur Gr. Butler, F.L.S., F.Z.S., &c. 



[Received January 8, 1892.] 



(Plate VI.) 



The Lepidoptera here enumerated were obtained by Mr. "W. B. 

 Pryer and presented by him to the National Collection ; many of 

 them have suffered considerably from damp, but, fortunately, the 

 examples of the finest of the new species are in excellent condition. 



■ RHOPALOCERA. 



This part of the collection is of little value, and the specimens 

 are much damaged ; it, however, contains examples of an interesting 

 Elymnias. The following is a list of the species : — Calliplcea ma- 

 zares, Moore, Salpinx kadu, Eschscholtz, Elymnias (probably the 

 male of E.penanga, Westw., black above, with the interno-basal half 

 and a belt across the apical area of the primaries slaty lilacine), 

 Eurytela castelnaui § , Felder, Neptis thamala, Moore, Rahinda 

 sandaka, n. sp.\ Athyma nefte, Cram., Euthalia dunya. Hew., 

 Lebadea padaka, Moore, Jmathusia phidi'ppus, Linn., Hypolimnas 



^ Exactly like E. peraka, excepting that the submarginal band of the 

 primaries is single instead of treble— a distinction which is believed to be 

 constant. 



