Geological Society. 425 



areas seems, from our own knowledge, to hold good. "Whether sea- 

 fish hatching will prove successful in the future time will show, but 

 the Dunbar Hatchery has not altogether been prosperous. Let us 

 hope the new hatchery at Nigg Bay, Aberdeen, will flourish, with 

 best wishes to its active promoter and superintendent. 



PROCEEDINGS OF LEARNED SOCIETIES. 

 GEOLOGICAL SOCIETY. 



February 22nd, 1899.— W. Whitaker, B.A., F.R.S., 



President, in the Chair. 



The following communication was read: — 



'Remarks on the Genera Eciomaria, Koken, and Hormoioma, 

 Salter; with Descriptions of the British Species.' By Miss Jane 

 Donald. 



This paper deals with some of the genera into which the family 

 of the Murchisoniida? has been divided, and confines itself to the 

 established genus Hormotoma, Salter, and the new genus Ectomaria, 

 Koken, which contain some of the oldest known species of elongated 

 gasteropoda. Both forms are distinguished from the typical 

 Murchisonias by merely possessing a sinus in the outer lip, instead 

 of having a deep narrow slit with parallel edges ; the lines of 

 growth also retreat towards, and advance from, the sinus more 

 obliquely. The Author prefers to separate the elongated shells 

 from the shorter Pleurotomariida?, as Koken does, and to let the 

 former constitute the family Murchisoniidse. 



The genera are described, with two new species of Ectomaria and 

 two new varieties of Ectomaria pagoda, Salt. Six new species of 

 Hormotoma are also described, together with the species H. Salteri, 

 Ulrich & Scofield, H. '! gracillima, Salt., H. cingulata, His., and 

 //. articulata, Sow. The species of Ectomaria are all derived from 

 the Cambrian and Ordovician rocks of Scotland, and the species of 

 Hormoioma from various beds, ranging from the Durness Limestone 

 to the Upper Ludlow rocks. An account of the distribution of the 

 genera over Europe and America is also given. 



March Sth, 1899.— W. AVhitaker, B.A., F.R.S., 

 President, in the Chair. 



The following communication was read : — 



' An Analysis of the Genus Micraster, as determined by rigid 

 Zonal Collecting, from the Zone of EJu/ncJwnella Cuvieri to that of 

 Micraster eor-anguinum.' By Dr. A. W. Rowe, F.G.S. 



The Author has endeavoured to show, by means of rigid zonal 

 collecting on a large scale, from the White Chalk of the Southern and 

 Ann. &■ Mag. N. Hist. >Ser. 7. Vol. iii. 31 



