180 Geological Society. 



apical dark area of fore wing is wider and the basicostal 

 yellow streak on hind wing is clear 5''ellow. 



Length of fore wing : eudiabohcs, ^ 21*5, ? 23 mm. — 

 expanse, ^ 47, ? 50 mm.; ladas, ^ 34, ? 29 mm.— ex- 

 panse, ^ 74, ? 64 mm. 



Hah. British New Guinea (type ? , Upper Aroa River, 

 Brit. New Guinea, March 1903, A. S. Meek). 



26. Delias aglaia angustifascia, subsp. n. 



Fruhstorfer quotes agl. pandecta, Stdgr., from N. Borneo, 

 with a ?. I have two ^ ^ and one ? from tliere, and they 

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



^ . Differs from agl. goda in tlie 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 agl. 

 beata. 



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

 Hose). 



PllOCEEDINGS OF LEARNED SOCIETIES. 



GEOLOGICAL SOCIETY. 



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

 in the Chair. 



The following communication was read : — 

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

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

 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 Caered Mudstones and Nant-pig Mudstones, both of Middle 

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

 descriptions of several forms which are either new or of particular 

 interest : namely, Agnostus Icjerulji, two new species of Agnostus, 

 a species of Agraulos, of Dori/pyge, of Corynexoclius, and 8oleno- 

 l^lenra a/pplanata, and to give brief notes on a number of other 

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

 A. alius, A. trnncatus, Microdiscus ptinctaHis, Conocoryphe cf. 

 (lalmani, and Paradoxides liicksii 



The vertical distiibutiou of the different forms 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. Uling in the Abbey Shales of Nuneaton. This 

 comparison strengthens the opinion already put forward in the 

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

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



