180 Geological Society. 



apical dark area of fore wing is wider and the basicostal 

 yellow streak on hind wing is clear yellow. 



Length of fore wing : eudiabohis, (J 21*5, ? 23 mm. — 

 expanse, cJ 47, $ 50 mm.; laJas, ^ 34, ? 29 mm.— ex- 

 panse, cJ 74, ? t)4 mm. 



//ah. British New Gninoa (type ? , Upper Aroa River, 

 Brit. New Guinea, March 1003, A. S. Meek). 



2G. Delias aglaia angiistlfancia, sul).sp. n. 



Fruhstorfcr quotes ogl. pandecta, Stdgr., from N. Borneo, 

 with a '?. I have two (J j" and one ? from there, and they 

 are very distinct, the ? being nearer agf. goda ? . 



cJ . Differs from ogl. goda in the whitish, NOT blue-grey 

 markings and the reduction of the yellow on hind wings. 



$ . Differs from agl. goda in the narrower oblique white 

 band on fore wing, this being even narrower than in ogl. 

 beata. 



Hah. N. Borneo (type S, Mt. Mulu, 1000-4000 feet. 

 Hose). 



PROCEEDINGS OF LEARNED SOCIETIES. 



GEOLOGICAL SOCIETY. 



June 24th, 1914.— Dr. A. Smith Woodward, F.R.S., President, 

 in the Chair. 



The following comraunication was read : — 

 'The Trilobite Fauna of the Middle Cambrian of the St. 

 Tudwal's Peninsula (Carnarvonshire).' By Tressilian Cliarles 

 Nicholas, B.A., F.G.S. 



In a previous paper on the geology of the St. Tudwal's Peninsula 

 approximate detenninations were given of the fossils found in the 

 Upper Cacred Mudstones and Nant-pig Mudstones, both of Middle 

 Cambrian age. The object of the present paper is to give detailed 

 descriptions of several forms wliich are either new or of particular 

 interest : namely, Agnostus Jcjerulji, two new species of Agnostnn, 

 a species of Agraulos, of Dorgpyge, of Corynexochus, and Soleno- 

 pleura applanata, and to give brief notes on a number of other 

 species, including Agnostus jmnctuosiis, A. exaratus, A. Jissus, 

 A. alius, A. truncatus, Mici-odiscus punctatus, Conocoryphe cf. 

 finlmani, and Paradoxides hicksii 



The vertical distribution of the different fonns through the 

 Upper Caered and Nant-pig Mudstones is tabulated and compared 

 with that of other areas, particularly the succession recently estab- 

 lished by Mr. V. C. Illing in the Abbey Shales of Nuneaton. This 

 comparison strengthens the opinion already put forward in the 

 previous comraunication, that there is a non-sequence at the base of 

 the Lingula Flags in the St. Tudwal's Peninsula. 



