382 Reports and Proceedings — 



rocks belonging to all the three zones of St. Cassian, and a part also 

 of the Raibl. Detailed descriptions and illustrations of the dispo- 

 sition of the strata near Cortina d'Ampezzo, Seeland Thai, the Seisser 

 Alpe, etc., are given ; and in all cases it is shown that the order 

 recognized in the St. Cassian-Prelongei area is retained practically 

 unmodified, and can be satisfactorily correlated with that of the 

 Upper Trias of the Bavarian Alps. 



7. "Notes on some New and Little-known Species of Carboni- 

 ferous Murchisonia." By Miss Jane Donald. (Communicated by 

 J. G. Goodchild, Esq., F.G.S.) 



Tn a previous paper, the various sections into which it has been 

 considered advisable to group diifei'ent species of Murchisonia have 

 been noticed. Of the species described in the present communi- 

 cation, two only can be undoubtedly referred to Goniostropha of 

 OEhlert. Others have the sinus situate above the angle ; and if this 

 position of the sinual band be considered sufficiently distinctive, the 

 authoress suggests the name Hypergonia for this section, and takes 

 Murchisonia quadricarinata as the type. 



The following new forms are described: — Muchisonla (Gonio- 

 stropha) hibernica, M. (6r.) Tntei, M. (Hypergonia) quinquecnrinata, 

 De Kon., var. pulchella, M. (H.) conula, De Kon,, var. convexa, 3f. 

 (H.) pentonensis. M. [H.) Kirkhiji, M. (if.) plana, M. (Coelocaulus^) 

 tuedia. 



A fuller description is also given of a species previously described 

 by Prof. Haughton under the name of Cerithioides telescopitim. 



8. "Notes from a Geological Survey in Nicaragua." By J. 

 Crawford, Esq., State Geologist to the Nicaraguan Government. 

 (Communicated by Prof. J. Prestwich, LL.D., F.R.S., F.G.S.) 



Nicaragua, geologically considered, can be divided, from north to 

 south, into five zones, differing from one another in lithological, 

 mineralogical, and structural characters. 



The first division embraces the central mountainous parts, and 

 contains Laurentian, Taconian, Cambrian, and Silurian rocks, also 

 Devonian rocks unconformable to the last. The second division, 

 parallel to that just named, and extending to within a hundred 

 miles of the Caribbean sea, contains sediments of Carboniferous, 

 Permian, and Mesozoic ages, covered unconformably by Cainozoic 

 and modern formations. In some of the rivers of this division are 

 rich gold-placers. The third division is the delta on the eastern 

 coast. Evidence furnished by alluvial deposits and coral-reefs in- 

 dicates recent subsidence imtil a few years ago, when elevation 

 commenced. The fourth division is on the western side of the first 

 (central) division. Its rocks are generally similar to those of the 

 second division. In some places dykes are connected with lava- 

 flows. In the valley of the Eio Viejo is a Tertiary mammal iferous 

 deposit with Tillodonts. etc. The fifth division occupies Western 

 Nicaragua, and contains several small crater-lakes of the Vicksburg, 

 Yorktown, and Sumpter periods ; all the post-Mesozoic Nicaraguan 

 volcanoes are in this division. 



Details of the economic products, the volcanic phenomena, and the 



