Geological Society, 2'1'9' with slightly curved end. About each group of spines are massed thirty to tliiriy-five small round spinnerets. A nuinber of short si)ines are scattered over the dorsal and ventral surfaces of the derm. Hah. Ypirauga, State o£ S. Paulo. On the twigs of Campomanesia sp., a bush common on the " campos." Genus PSEUDOKERMES, CkU. Pseudoherrnes ni'tens, Ckll. Male scale small, elliptical, convex, white, thin and very frail. The dorsum and margin are ornamented with several small tubercles. The posterior end is recurved and carries on the dorsal suiface a small flat round plate, whicii is pushed off when the male emerges. Length 1*25 millim. ; width '50 millim. Adult male dimorphous, some individuals being winged, others wingless. The body is dark brown, oval, widest across the tliorax, truncated behind. Total lengtii l'04l millim., v.-idth '416 millim. Length of genital spike •312 millim. Tlie winged form emerges about a week or ten days after the other. Tlie antennai are hairy and of ten joints, the last joint terminate I by two long knobbed hairs. Wings ordinary; no halleres were found. Head small, with four ocelli. Genital spike broad and flat, obtusely pointed. Legs long, slender, and hairy. Claw long and slightly notched. The four digitules are slender and knobbed; tlie tarsal digitules do not extend to the tip of claw. Li the wingless form the antennae are 9-jointed, otherwise the two forms agree. Uab. Rio Grande do Sul and S. Paulo. On the twigs of Myrtus (^Blepharocalyx) Tioeediif Pridian sp., and other plants. [To be continued.] PROCEEDINGS OF LEARNED SOCIETIES. GEOLOGICAL SOCIETY. June 20th, 1900.— J. J. H. Teall, Esq., M.A., F.R.S., President, in the Chair. The following communications were read : — 1. ' On the Skeleton of a Theriodoat Reptile from the Baviaans River (Cape Colony).' By Prof. H. G. Seeley, F.R.S., F.L.S., V.P.G.S. The fossil described in this paper was discovered by Mr. W. Pringle at Ealdou, in the bed of the Baviaans River, a tributary of the Great Fish River. It is now preserved in the Albany Museum. The slab containing it is of hard siliceous sandstone, and is 31 inches long bv
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