[Pboc. Roy. Soc. Victoria, 24 (N.S.), Pt. I., 1911.] 



Akt. XIII. — Neio or Little-Known Victorian Fossils in 

 the National Miiseuiin. 



Part XIII. — Somk Silurian Spkcies of the Gknus Lingula ; 

 WITH Notes on its Shell-Structurk and a Parasitic 

 Plant. 



By FREDERICK CHAPMAN, A.L.S., &c. 



(National Museum, Melbourne). 



(With Plates XLV.). 

 [Kead 13th July, 1911]. 



Introductory Remarks. 



Two species of the genus TAiigula have been described from 

 the Silurian rocks of Victoria — viz., Lingula spryi, Chapman, 

 and L. yarraensis, Chapm. (olim L. lafior. Chapman non 

 McCoy).^ The present paper deals with four more species and 

 varieties — L. lewisii, J. de C. Sowerby, var, flemingtonensis, var. 

 nov. ; L. cf. striata, J. de C. Sowerby; L. aff. symondsi, David- 

 son; and L. ijerovata, J. Hall. 



Both divisions of the silurian in Victoria have afforded speci- 

 mens of Lingula, but the genus is far more abundant in the 

 lower, or melbournian, stage ; only one species, L. perovata, 

 occurring in the yeringian. The melbournian species agree to 

 some extent with already known forms, ranging from the 

 Upper Llandovery to the Upper Ludlows in Great Britain. The 

 yeringian species now recorded occurs in the Niagara series 

 (Wenlockian) of North America. L. syniondsi, to which our 

 passage-bed species seems related, has a fairly wide range in 

 Great Britain, from the Upper Llandovery to the Lower Ludlow, 

 The genus, as might be expected from the generally wide geo- 

 logical range of the different species in silurian strata, does not 



1 L. upri/i, Chapm., Proc. Roy. Soc. Victoria, vol. xvi., Pt. 1, ii.s. (1903), p. Hi, pi. x. 

 figs. 9, 9a. L. latior, Chapm., op. cit., p. 65, pi. x., figs. 10, 10a : iiom. mut. L. yarraevsis, 

 <Jhapm., op. cit., vol. xviii., Pt. 1, ii.s. (1905), p. 19. 



13.V 



