124 TUANSACTIOXS, NATURAL HISTORY SOCIETY OF GLASGOW. 



support to the view that the sporangia of SphenophyUum 

 trichomatosum were sessile. 



I have only met with this species in the Middle Coal Measures 



Sphenophyllum cuneifolium, Sternb. sp. 



1823. Rotularia cuneifolia, Sternberg. Vers. I., fasc. 2, p. 33, 

 PI. XXVI., figs. 4a and ih. 



ISSO. Sphenophyllum ctinei/olium, Zeiller. Veget. foss. du terr. 

 houil. de la France, p. 30, PI. CLXI., figs. 1-2. 



1831. S^jhenophyllum erosum, L. and H. Fossil Flora, 

 Vol. I., PI. XIII. 



1871. Volkmannia Dawsoni. Will. ^fem. Lit. and Phil. Soc. 

 Manchester, Ser. 3, Vol. V., p. 28. 



1884. Bowmanites Dawsoni, Weiss. Steinkohlen Calamarien 

 II. ( Ahhand. z. geol. Sp)ecialkarte v. Freussen u. d. 

 Thuringischen Staaten, Vol. V., Heft. 2), pp. 201-202. 



1893. Sphenophyllam cuneifolium, Zeiller. Etude sur la con- 

 stitution de V appareil fructificateur des Sphenophyllum.. 

 Mem. de la Soc. G4ol. de France. PaUont. Mdm., No. 

 11, Vol. IV., pp. 1-39, PL I., PL II., figs. 1-3; PL III., 

 figs. 1-2. 



1895. Sphenophyllum Dawsoni, Williamson and Scott. Phil. 

 Trans., VoL CLXXXV. (1894), B., p. 933. 



1898. Sphenophyllostachys Dawsoni, Seward. Fossil Plants, 

 Vol. I., p. 401. 



Sporangia two to four, usually three, oval, attached to the 

 extremities of the delicate pedicels or sporangiophores. Sporan- 

 giophores spring from the base of the upward rising saucer-like 

 collar formed by the united bases of the bracts. Free portion of 

 bracts linear lanceolate. The sporangiophores each spring from 

 a point at an equal distance from the axis, and appear to be 

 placed side by side at their point of origin, but they vary in 

 length according to whether they bear the sporangia of the first, 

 second, or third circle. The sporangiophores rise upwards and 

 bend towards the axis, having suspended from their extremity a 



