180 FmJpricl- CJi(,pm<m: Fof^sils, Fart XIII. 



EXPLANATION OF PLATE XLV. 



Fie:. L — Lingula leivisii, Sow., var. femingtonensis, var, nov. 

 Silurian (melbournian). Moonee Ponds Creek, 

 Flemington. Geol. Surv. Coll. Nat. size. 



Fip-. 2. — L. lewisii. Sow., var. ftemingtonensis, var. nov. Por- 

 tion of shell of another specimen, showing the 

 deep radial striae ; also the irregular character 

 of the concentric growth lines. Silurian (melbour- 

 nian). Moonee Ponds Creek, Flemington. Geol. 

 Surv. Coll. X 3. 



Fig. 3. — Ditto. Vertical section of the shell (external surface 

 beneath), showing the pale horny layers, the dark, 

 altered intermediate layers, and also traces of a 

 parasitic boring plant. Same locality, x 52. 



Fig. 4. — Ditto. Thin flake of shell parallel and close to surface, 

 showing minute canaliculi permeating the horny 

 shell substance. (Diagrammatic). Same locality. 

 X 380. 



Fig. 5, — Ditto. Portion of vertical section of shell shown in 

 figure 3, more highly magnified, with fibrous 

 horny layer below (a)^ surmounted by the origi- 

 nal calcareous layer (h). x 100. 



Fig. 6. — Ditto. A flake from the horny layer of shell, probably 

 near A^isceral surface, perforated by boring fungus. 

 Same locality, x 60. 



Fig. 7. — LinguJd cf. striata, Sowerby. Silurian (melbournian). 



South Yarra. Coll. F. P. Spry 



X 



Fig 8. — L. aff. sgmoiidsi. Sow. Silurian. N.E. of Kilmore. 

 Coll. Norman Taylor, x 2. 



Fig. 9. — Ditto. More highly magnified surface of same shell, 

 showing the fimbriated concentric growth lines, 

 and faint radial striae, x 6. 



Fig. 10. — L. perovata, J. Hall. Silurian (yeringian). Mer- 

 riang Road, near Whittlesea. Coll. J. T. Jutson. 

 X 2. 



Fig. 11. — Ditto. Portion of shell surface more highly magni- 

 fied, shoAving ridge-like growth lines and inter- 

 mediate striae. x G. 



e* 



