382 Mejjojis and Proceedings — 



6. Anrlesitic lavas and ashes, followed by conglomerates of the 

 same materials. 



c. Ash}' grits and shales containing Climacogrnptiis antiquns ? C. 

 hicornis f G. Scharenhei-gi, CryptograpsnH triconiis, Diplograpsns 

 foliaceiis, Leptograpsus flaccidus ? Beyrichia complicata, TrinucJens 

 concentricus, Orthts testudiuaria, Belleroplion bilobatus. The rocks 

 are thus of Bala age, the fossils indicating that the ashy grits and 

 shales are on the horizon of the top of the Glenkiln or bottom of 

 the Hartfell series. 



These are followed by Sikirian strata. 



a. Pentamerus-heds. Soft sandstones and mndstones yielding 

 Pentnmerus glohosus f P. oblongus, P. undatus, Leptmna transversalis, 

 Stropliomena rJwmhoidolts, Petraia subduplicata. 



b. Purple shales, unfossiliferous. 



c. Lower Wenlock Shale, with Monograptus vomerinus f Crypto- 

 grapsns, sp., M. priodon, var. Flemingi. These gi'aduate into : — 



d. Upper Wenlock Shale, with M. priodon, M. vomerinus ? M. 

 basilicus, M. Nilssoni, M. Boemeri. 



e. Lower Ludlow Shale. 31. colonus, M. Nilssoni, M. Saliveyi, M. 

 lintwardenensis. 



The paper concluded with microscojpical descriptions of the igneous 

 rocks, of which there are two sets : — 



a. An older set interbedded with the Cambrian and consisting of 

 andesites bearing a large percentage of a mineral allied to enstatite, 

 together with angite and a small quantity of hornblende and mica. 

 These are chiefly lavas, but some few are perhaps intrusive rocks and 

 dykes. 



b. Intrusive rocks of a diabase type, generally, however, contain- 

 ing a variety of enstatite identical with that in the andesites. These 

 are intrusive in the Cambrian rocks, and from their relations appear 

 to be most probably of Post- Silurian age. 



3. " Note on the Zoological Position of the genus 3Iicrochoeriis, 

 Wood, and its apparent Identity with Hyopsodus, Leidy." By E. 

 Lydekker, Esq., B.A., F.G.S. 



In this paper the author discussed the character of the genus 

 MicrocJicerus, Wood, from English Upper Eocene deposits, which 

 has hitherto been regarded as an Ungulate form, and showed that 

 it is really an Insectivore. He also indicated that the American 

 Eocene form Hyopsodus, Leidy, is almost certainly identical with 

 Microclimrus. 



4. " Observations on some imperfectly known Madreporaria from 

 the Cretaceous Formation of England." By R. F. Tomes, Esq., F.G.S. 



This communication contained notes on several species of Cre- 

 taceous corals. The author considered that Smilofrochus insignis of 

 Duncan must be referred to the genus Ceratotrochus, that S. granu- 

 latus, Duncan, was founded on immature specimens of Trochocyafhis 

 Wiltshirei, Duncan, that Micrabacia Fittoni, Duncan, is a variety 

 of Cyclocyathus Fittoni, that the genus Podoseris, Duncan, and pro- 

 bably SyzygopliyUum, Reuss, are the same as lihizangia, M.-Edw. 

 and Haime, and consequently P. mammiliformis, Duncan, and P. 

 elongata, Duncan, are species of Bhizangia. He further states that 



