New or Little-known Victorian Fossils. 307 



terior margin makes a wide curve towards the ventral border, 

 meeting it at an obtuse angle. Edge view sub-triangulai", very 

 thick posteriorly, gradually tapering towards the front. End 

 view sub-triangular and inflated, but flattened on the ventral 

 surface and somewhat depressed along the dorsal line. Valves 

 slightly unequal. Surface of valves smooth or feebly piinctate. 



Dimensions. — Length of carapace, .94 mm. ; height, .42 

 mm. ; thickness, .64 mm. 



Observations. — This species seems to show decided affinities 

 towards Xestoleberis corbuloides, Jones and Holl sn.^ It differs 

 from it, however, in the greater angularity and width of the 

 posterior extremity of the valves. I have taken the oppor- 

 tunity to name this species after Dr. H. B. Holl, F.G.S., who 

 did so much good work on Palaeozoic Ostracoda in conjunction 

 ^\'ith Professor T. Rupert Jones. 



Locality and Horizon. — Cave Hill, Lilydale. Silurian (Yerin- 

 gian). 



Xestoleberis lilydalensis, sp. nov. (PI. XIV., Figs, la-c, 



5a-c, 8a, b. 



Description. — Carapace seen from the side narrow-oblong ; 

 ends unequally rounded ; the posterior extremity narrow and 

 sharply rounded; the anterior, broadly curved and terminating 

 somewhat abruptly at the ventral angle, forming by the de- 

 velopment of flanges a small beak-like projection ; dorsal mar- 

 gin gently convex, ventral nearly straight. Surface sparsely 

 punctate. Edge view subovate, tumid, greatest thickness a 

 little in front of the posterior third, and tapering more or less 

 evenly to the anterior end. End view depressed cordate. 



Dimensions. — Spec. 1. Length of carapace, .53 mm. ; height, 

 .21 mm. : thickness, .32 mm. 



Type. — Spec. 2. Length of carapace, .78 mm. ; height, .35 

 mm. ; thickness, .46 mm. 



Observations.- — An Ordovician Xestoleberis (X. wrightii) has 

 been fiufured and described from the Chair of Kildare, Leinster, 



1 Cy there corbuloides, Jones and Hall, Ann. Mag. Nat. Hist., ser. 4, vol. iii., 1869, pp. 

 ■211, 212, pi. XV., figs. 4a-e, 5a, b. 



Xestoleberis corbuloides, Id., ibid., ser. 5, vol. xix., 1887, p. 410. 



20a 



