242 Geological Society. 



dumbbell-shaped vascular centres. The specimen was collected by 

 Mr. B. Wright, in the Upper Devonian of New York. 



Another new fern from New York is a species of Equisetides (E. 

 Wrighticmum), showing a hairy or bristly surface, and sheaths of 

 about twelve, short, acuminate leaves. 



A new and peculiar form of wood, obtained by Prof. Clarke, of 

 Amherst College, Massachusetts, from the Devonian of New York, 

 was described under the name Cellvloxylon primcevum. It presents 

 some analogies with Prototaxites and with Aphyllum paradoxum of 

 Unger. 



Several new ferns were described from the well-known Middle 

 Devonian plant-beds of St. John's, New Brunswick ; and new facts 

 were mentioned as confirmatory of the age assigned to these beds, as 

 showing the harmony of their flora with that of the Erian of New 

 York, and as illustrating the fact that the flora of the Middle and 

 Upper Devonian was eminently distinguished by the number and 

 variety of its species of ferns, both herbaceous and arborescent. It 

 will probably be found eventually that in ferns, equisetaceous plants, 

 and conifers the Devonian was relatively richer than the Car- 

 boniferous. 



Reference was also made to a seed of the genus AZtheotesta of 

 Charles Brongniart, found by the Rev. T. Broun in the Old Red 

 Sandstone of Perthshire, Scotland, and to a species of the genus 

 Dicranophyllum of Grand'-Eury, discovered by Mr. R. L. Jack, E.G.S., 

 in the Devonian of Queensland. 



In all, this paper added six or seven new types to the flora of the 

 Erian period. Several of them belong to generic forms not pre- 

 viously traced further back than the Carboniferous. 



The author uses the term " Erian " for that great system of for- 

 mations intervening in America between the Upper Silurian and the 

 Lower Carboniferous, and which, in the present uncertainty as to 

 formations of this age in Great Britain, should be regarded as the 

 type of the formations of the period. It is the " Erie Division " 

 of the original Survey of New York, and is spread around the shores 

 of Lake Erie, and to a great distance to the southward. 



4. " On the Terminations of some Ammonites from the Inferior 

 Oolite of Dorset and Somerset." By James Buckman, Esq., E.G.S., 

 F.L.S. 



The author referred to the figures given by D'Orbigny of Jurassic 

 Ammonites having the mouth-termination perfect, and proceeded to 

 describe the characters presented by complete specimens obtained by 

 him from the Inferior Oolite of Dorsetshire and Somersetshire. He 

 enumerated 14 species, which he classified as follows, in accordance 

 with the nature of the terminations : — 1. Termination lanceolate, 

 i. e. with a lance-shaped process on each side of the mouth (A. con- 

 cavus, subradiatus, Eduardianus) ; 2. Ovato-lanceolate or spathulate, 

 i. e. with a spathulate process on each side of the mouth (A. Braiken- 

 ridgii, linguiferus, Sauzii, Martinsii, subcostatus) ; 3. Delphinulate 



