112 Proceedings of the Royal Society oj Yictoria. 



Yari-a Rivers. Collected by Geol. Surv. Vict. B. 23. [441-3]. 

 Silurian. 



Beyrichia kilmoriensis, sp. nov. (PL XVI., Fig. 9). 



Description.— Y-aXwe?, sub-oblong, general area flat. Dorsal line 

 straight, except where broken by the salient lateral lobes. 

 Ventral border well-rounded, especially in front. The two fore 

 most lobes narrow, long, and curved towards the anterior end ;. 

 the hind-lobe nearly obsolete, most conspicuous at the dorsal 

 edge on the posterior angle. Curved border with an upturned rim. 

 Surface of valves smooth. 



Measurements. — Length, 2.45 mm.; height, 1.36 mm. 



Obse?-vatiofis. — This species and the next one to be described- 

 belong to the jugose type of Beyrichise, and in the narrowness of 

 the lobes resemble B. complicata, Salter,^ which, by the way, is a 

 characteristic Ordovician fossil. The tapering character and 

 evanescence of the two foremost lobes in the region of the ventral 

 border in our species, however, is strikingly distinct. 



Locality and Horizon. — Found at Broadhurst's Creek, east of: 

 Kilmore, Victoria. Collected by Geol. Surv. Vict. Bb 18. 

 [445]. Silurian. 



Beyrichia ligatura, sp. nov. (PI. I., Fig. 10). 



Description. — Valves sub-oblong, rather narrow in lateral aspect, 

 surfaces somewhat convex, with the three lobes well-marked. 

 The anterior lobe pear-shaped, salient, and strongly curved 

 towards the antero-dorsal angle; middle lobe narrow pear-shape,, 

 and very prominent or even ridgelike, with a slight forward, 

 curvature, and salient on the dorsal edge of the valve ; posterior 

 lobe smaller than the anterior, pear-shaped and resting against 

 the upturned rim of the ventral border. The other lobes do not 

 quite reach the sulcate area inside the ventral rim of the valve. 



Measurements. — Length, 1.6 mm.; height, 1 mm. 



Locality and Horizon. — Junction of the Woori-Yallock and the- 



1 Mem. Soc. Geol. Surv., 1S48, vol. ii., pt. i., p. 352, pi. viii., fif,'. 16; also M'Coy,. 

 Brit. Pal. Foss., 1851, pt. ii, fasc. 1, p. 136, pi. i. K., fi^'- 3. 

 Salter, ibid., 1852, fasc. 2, .\ppendix .-V, p. ii. 

 Compare Jones, 1855, Ann. and Mag. Nat. Hist., Ser. 2, vol. xvi., pi. vi., fig. 4. 



