Victoriaa Fossils, Part XIII. 185 



Lingula pepovata, J. Hall. (PI. XLV., Figs. 10, 11). 



Lingula jjeroratd. J. Hall, 1852, Pal., New York, vol. II., 

 p. 55, pi. XX., figs. 3«, h. 



The original description runs as follows : — 



" Shell abruptly obovate, as wide as long, the base regularly 

 rounded, and the sides much expanded : beak abruptly acute ; 

 surface marked by fine, rather distinct, elevated concentric 

 lines ; intermediate spaces smooth to the naked eye, but ex- 

 hibiting under the magnifier fine, scarcely elevated, concentric 

 lines." 



The present example is a pedicle valve, from the yeringian 

 sandy nuidstone of Merriang Road, near Whittlesea.l It is 

 somewhat damaged on the median area, but shows the outline 

 clearly, and part of the ornament, consisting of distinct, distant 

 ridge-like striae, not crossed by radial lines. The interspaces 

 between the concentric striae are marked by tine concentric 

 lines exactly as in the North American specimens. Prof. J. 

 Hall's examples came from the Upper Green Shale of the 

 Rochester stage, which forms part of the Niagara series 

 (Wenlockian). 



The only other species which closely approaches this form in 

 its regularly subtriangular shape is L. roucdti, Salter,2 from 

 the Budleigh Salterton Pebble-beds (? ordovician). However, 

 the radial striae serve to distinguish it from the present 

 example. 



Hall and Clarke, in their monograph on rlie Palaeozoic 

 Brachiopoda,^ draw attention to the fact that the acuminate 

 type of Lingula prevailed both numerically and specifically in 

 the earlier faunas and persisted until carboniferous times. 

 It is not represented in the living species of the genus. 



Measurements. — Length, 4.75 mm. ; width, 5.25 mm. 



Occurrence. — Silurian (yeringian). Merriang Road, section 3, 

 near Whittlesea. Found and presented by Mr. J. T. Jutson. 



1 Recorded as 0) Lingula by the writer in J. T. Jutson's "Ihe Silurian Rocks of the 

 Whittlesea District." Proc. Roy. Soc. Victoria, vol. xxi., Pt. I., n.s. (190S), p. 221. 



2 Quart. Journ. Geo! Soc, vol. xx.,1863, pi. xvii,, figs. 4, 5. Also Davidson, Mon. Bil. 

 Brach. (Pal. Soc), 1866, p. 40, pi. I., figs. 14-20. Idem, Quart. Journ. Geol. Soc, vol. x.Kvi 

 1870, p. 76, pi. iv., fig. 2. 



3 Geol. Surv., State of N. York. Palaeontology, vol. viii., pt. i. 1892, p. 5. 



