Miscellaneous. 349 



certainty from a definite locality *, Simon's example being 

 quoted merely as South American. 



It appears to me highly probable that this spider — Citha- 

 roscelus Kochii — is specifically identical with that which 

 Koch described and figured as My gale rosea, Walck. ; but 

 Mygale rosea of Walckenaer is, according to Simon, quite 

 another species, and has been made the type of the genus 

 Phryxotrichus. 



PROCEEDINGS OF LEARNED SOCIETIES. 



GEOLOGICAL SOCIETY. 



February 1st, 1899.— W. Whitaker, B.A., F.R.S., 

 President, in the Chair. 



The following communication was read: — 

 ' On Radiolaria in Chert from Chypon's Farm, Mullion 

 District (Cornwall).' By Dr. G. J. Hinde, F.R.S., F.G.S. 



This paper describes the discovery of a bed of chert on the 

 mainland, similar to that already described from Mullion Island. 

 It was found in 1877 by Mr. Howard Fox at Chypon's Farm. 

 Although detached blocks had been noticed in the fields, the rock 

 had not been previously observed in situ. The chert is interbedded 

 with clay-slates, and it is a dark massive rock much traversed by 

 quartz-veins ; in some parts of it the radiolaria are preserved in an 

 unusually perfect condition, showing their latticed structure and 

 spines very distinctly. The radiolaria for the most part are casts 

 only, without any definite bounding-walls, their outlines being 

 indicated by the dark material of the groundmass, while the 

 interior of the test has been infilled with clear silica, sometimes the 

 cryptocrystalline variety, at others fibrous chalcedony. In the 

 forms showing the structural details, these alone have been replaced 

 by the opaque substance, and are thus clearly defined against the 

 clear silica infilling the test. Eleven species are described, of which 

 ten are new, while one has been previously recognized in the cherts 

 of New South Wales. 



MISCELLANEOUS. 

 S.E. Union of Scientific Societies. 

 We are informed by the Hon. General Secretary that the date of 

 the next Congress of the above, which will be held at Rochester, 

 has had to be altered to May 25th, 26th, and 27th, to suit the 

 convenience of the local Society. 



* In the ' Biol. Centr. -Americana,' Arachnida Araneida, vol. ii. p. 23 

 Mr. F. Cambridge erroneously states that these specimens were from Peru! 



