New or Little-known Victorian Fossils. 65 



excavations near Collins Stieet [598-9], and also at South Yarra 

 (Yarra Improvements) — [596]. The similar colouration and 

 appeaniiice of the rock from both localities point to the proba- 

 bility of their being on the same geological horizon for although 

 the Silurian rocks vary considerably in their lithological appear- 

 ance in a vertical direction in these localities, they show persistent 

 characters over the same zonal area. Collected by Mr. F. Spry, 

 in whose honour the species is named. 

 Horizon. — Silurian (Melbournian). 



Lingula latior, sp. nov. (PI. X., Figs. 10, 10a). 



specific characters. — Valve subovate, sides sloping outwards 

 towards the anterior border, which is broad and well-rounded ; 

 beak somewhat blunt but prominent. Surface smooth, strongly 

 convex, and marked by a few faint growth-lines ; a few radial 

 creases start from the umbo and traverse the greater part of the 

 shell-surface. The impressions of the pedicle and protractor 

 muscles are faintly seen on tlie shell. 



Measurements. 



Length of valve - - - 4 mm. 



Width of valve - - - 3.6 ,, 



Thickness about - - - 1.3 ,, 



Affiniiies. — The form of this shell is of the L. squamiformis 

 type', but it is not so straight along the posterior border. It 

 most I'esembies L. lata of Sowerby"'', from the Lower Ludlow 

 rocks of England and Scotland, but differs from it in many 

 points, and especially in the stronger convexity of the surface. 



Occurrence. — In bluish argillaceous rock, South Yarra (Yarra 

 Improvements), Melbourne. Collected by Mr. F. Spry [59]. 



Horizon. — Silurian (Melbournian). 



Genus Siphonotreta^ de Verneuil. 



Slphonotpeta australis, sp. nov. (PI. X., Figs. 7, 8, 13; 

 PI. XL, Fig. 1). 

 Specific characters. — Pedicle valve bi'oadly ovate, surface 

 highest near pedicle opening, sloping steeply to the sides and 



1 Phillips: Geol. Yorkshire, 1836, vol. ii. p. 221, pi. xi., fig. 14. 



2 In Murchison's Silurian System, 1839, p. 618, pi. viii., fig. 11. 



