230 Reports and Proceedings — 



III. — Contributions a l'Etude de la Faune Jurassique de 

 NoRMANDiE. Premier Memoire sur les Trigonies. Par K. 

 Bigot. Memoires de la Societe Liuneenne de Normandie, xviie 

 volume, 2^ fascicule. 4to. pp. 261-34:5, pis. viii-xvii. (Caen, 

 1893.) 

 TFHB collection of fossils belonging to the Faculte des Sciences of 

 _L Caen comprises a large number of Trigonias, which have been 

 mostly obtained from the same beds and localities of the Jurassic 

 series in Normandy which furnished the type specimens described 

 by Agassiz and by D'Orbigny. The late E. E. Deslongchamps 

 made a preliminary study of these forms, without, however, leaving 

 behind more than a few notices respecting them ; his successor, 

 Prof. Bigot, has undertaken their investigation afresh, at the same 

 time retaining the MS. names which Deslongchamps had bestowed 

 upon the new species. This Memoir treats of the forms from the 

 Inferior Oolite, the Great Oolite, and the Oxford and Kimmeridge 

 Clays of Normandy, but it does not include those from the Lias of 

 the same region, nor the Portland species from Bray, which latter 

 have, moreover, been carefully studied by Muuier Chalmas, de 

 Loriol and Pellat. In all, Prof. Bigot here describes about fifty 

 species, amongst which twenty-one are new. 



In his introductory remarks, the author considers that the section 

 " Glabrae " of Agassiz might be suitably divided into three ; a 

 gTouping already in part suggested by Lycett. The first of these, 

 " Semi-lseves," includes T. Lingonensts, Dum,, T. Beesleyana, Lycett, 

 and T. Eudesi, n.sp., from the Lias, Bajocieu and Bathonien respec- 

 tively. The second, " Gibbosae," has for its principal species 

 T. gibbosa, Lycett, T. Manselli, Lycett, and T. Damoniana, from 

 the English Portland Beds, and five other species from the Upper 

 Jura of France. In the third section, "Excentricge," are ranged 

 species which commence in the Upper Jura and continue into the 

 Cretaceous ; the typical species are, T. excentrica, Sow., T. Iceviuscula, 

 Lycett, and T. Boloniensis, de Loriol. 



The detailed descriptions and excellent figures which Prof. Bigot 

 has given of these Normandy forms are of particular interest to 

 English students of Trigonias, in view of the fact that the types of 

 more than one-third the number of the species here described belong 

 to the Jurassic rocks of this country, and the author's review of the 

 descriptions of Lycett, Morris and Sowerby deserves the most careful 

 consideration. G. J. H. 



IaE!:E>OI^TS j^istid iPK-ooiEJEiDiisra-s. 



Geological Society of London. 



L— March 7th, 1894.— Dr. Henry Woodward, F.E.S., President, 

 in the Chair. The following communications were read : — 



1. " The Systematic Position of the Trilobites." By H. M. Bernard, 

 Esq., M.A., F.L.S., F.Z.S. (Communicated by Dr. Henry Woodward, 

 F.R.S., P.G.S.) 



