514 Reports and Proceedings — 



usual. The glaciation of the tropics would imply the glaciation of 

 the whole world, which appears no more possible than that the whole 

 world was submerged at one time. The author concludes with some 

 remarks on a recent paper by Mr. A. Tylor. 



6. "Notes on the Gasteropoda of the Guelph Formation of 

 Canada." By Professor H. Alleyne Nicholson, M.D., D.So., F.K.S.E., 

 F.G.S. 



The author notices the occurrence of the Guelph formation as a 

 subdivision of the Niagara series in Canada and the United States, 

 and describes it as consisting everywhere of a cellular, yellowish or 

 cream-coloured dolomitic limestone, of rough texture and. crystalline 

 aspect, containing innumerable cavities from which fossils of various 

 kinds have been dissolved out. Most of the fossils still existing in 

 the formation are in the condition of casts. The most characteristic 

 forms which have been recognized in it are Pentamerus occidentalis 

 (Hall), various species of Trimerellidae, Megalomus canadensis (Hall), 

 species of Favvsites and Amplexus, and numerous Gasteropods be- 

 longing chiefly to the genera Murchisonia, Pleurotomaria, Subulites 

 and ffolopea. Crinoids and Cystidians and Polyzoa occur abundantly 

 in some localities. 



In this paper the author describes all the known Gasteropoda of 

 the Guelph formation in Canada, including the following previously 

 described species: — Murchisonia Loganii (Hall), M. turritiformis 

 (Hall), M. macrospira (Hall), M. bivittata (Hall), If. longispira 

 (Hall), If. vitellia (Billings), M. Hercyna (Billings), Cyclonema ? 

 elevata (Hall), ffolopea guelphensis (Billings), ff.gr acia (Billings), Su- 

 bulites ventricosus (Hall), and Pleurotomaria solarioides (Hall). As 

 new species he describes Murchisonia Boylei, distinguished from ilf. 

 turritiformis (Hall) and M. estella (Billings) by its more rapid rate, 

 of expansion, its apparently canaliculated suture, and the existence 

 of an angular band a little above the suture ; and ffolopea ? occi- 

 dentalis, distinguished by its short but elevated spire, its large body- 

 whorl, which becomes almost disjunct at the aperture, its circular 

 aperture and large umbilicus. The upper whorls are convex, but the 

 body-whorl is obtusely angulated at about its upper fourth. Un- 

 certain species of Murchisonia and Pleurotomaria are also indicated. 



7. " Description of a New Genus of Tabulate Coral." By G. J. 

 Hinde, Esq., F.G.S. 



The coral described by the author as constituting a new genus of 

 Favositidae, for which he proposes the name of Sphcerolites, has a 

 massive, free corallum, consisting of minute, polygonal, closely united 

 corallites, growing in all directions from a central point, forming a 

 spheroidal body, the entire surface of which is occupied by the calices 

 of the corallites. The walls of the corallites are very delicate, with 

 numerous pores ; the tabulae are incomplete, formed by delicate 

 arched lamellae; and there are no septa. From Chcetetes this genus 

 is distinguished by the perforated walls and incomplete arched 

 tabulae ; from Favosites it differs in its mode of growth and its in- 

 complete tabulae ; and from Michelinia it is separated by the minute- 

 ness of its corallites, and the absence of epitheca and of septal striae. 



