138 Mr. R. Kidston on the Occurrence of the 



\)j the action of the spirit " was Gossea microdentopa ^ Bate. 

 1 succeeded in extractin,^^ tliree specimens from a mass of 

 fungus, and was rewarded by discovering that it was the same 

 species as that described bj Bate in the ' Catalogue of the 

 Amphipoda in the British Museum ' under the name of 

 Pherusa fucicola, Leach, at p. 145, and again under Gossea 

 microdentopa at p. 159. This therefore adds another to tlie 

 list of synonyms given by me in Ann, & Mag. Nat. Hist. 

 1891, ser. 6, vol. vii. p. 421, under tlie name Pherusa Jurinii^ 

 M.-Edw. It will not, however,*involve any alteration in the 

 generic name Apherusa proposed by me (Ann. & Mag. Nat. 

 Hist. 1891, vol. viii. p. 83), because a genus of CoBlcnterata 

 was named Gossea by Agassiz in the same year (1862) as Sp. 

 Bate's was published. It is therefore obviously more conve- 

 nient that Agassiz's genus should be retained. 



Pherusa hicuspis. 



This, as I have elsewhere* shown, is not Amphitho'c hi- 

 cuspis, Kroyer. 



Nant-y-Glyn, Colwvn Bav, 

 December 9, ] 891. 



XIX. — On the Occurrence of the Genus Equisetum (E. 

 Ilemingwayi, Kidston) in the Yorkshire Coal-measures. 

 By IloBEKT Kidston, F.H.S.E., F.G.S. 



Until the description o{ Equisetum Monyi ixom the Comentry 

 Coal-lield by MM. Ilenault and Zeiller f, there was no satis- 

 factory record of the occurrence of the genus Equisetum ia 

 Palaeozoic times %> 



* ' Fauna of Liverpool Bay,' 2nd Report, p. 173 ; ' Proceedings of the 

 Liverpool Biological Society,' vol. ii. p. 173. 



t ' Coniptes-reudus Acad. d. Sciences,' I'aris, January 5, 18S5. Also 

 see lienault and Zeiller, " jttudes sur le terr. houill. d. Oonientrv : Flore 

 fossile," part ii. p. 394, pi. Ivii. lig. 7 (Bull, de la Soe. de Tindustrie miut^ 

 rale, 3° si5r. vol. iv. ii' livr. 1800 : St. ttienne). 



X Several specimens from the Coal-nitasures have been de.^cribed under 

 the name of Eiiuisetites, but none of these examples are sufhcieutlv per- 

 fect to enable one to form any dotinite opinion as to their true sy.-tematic 

 position. 



Some have placed the Eqnisetites mirahllU, Sternb., in Equisetum. The 

 Equisetitcs luKjuIatus, Germar, is another sp(>oies whoso systematic posi- 

 tion Is not .satisfactorilv determined. 



