310 Proceedings of the Roi/al Society of Victoria. 



Observations. — The nearest allied palaeozoic Mjiciocypris 

 which may be at all compared with the above form is Macrocypris 

 vinei, Jones.^ M. vinei, however, does not, iu any of its 

 varieties, possess an acute anterior, nor so sloping an antero- 

 ventral margin ; moreover there is no attenuation of the pos- 

 terior extremity as in our form. M. flexuosa veiy nearly ap- 

 proaches the recent M. tenuicauda, G. S. Brady,'^ in general 

 form. 



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

 gian). 



Macpocypris (cf.) vinei, Jones. (PI. XTV., Fii^s. 7a-c). 



Macrocypris vinei, Jones, 1S87. Ann. Mae. Nat. Hist., ser. 

 5. vol. xix., p. 179, pi. iv., figs. 1-3, and woodcut. 



M. vinei, Jones, 1887. Silur. Ostrac. Gothland, p. 6. 



M. vinei, Jones, 1888. Ann. Mag. Nat. Hist., ser. 6, vol. i., 

 p. 396, pi. xxii., figs. 1 a-c, 2. 



Observations. — The Lilydale specimens differ principally in 

 the higher and more flexuose carapace, the sloping anterior, 

 and the more evenly rounded posterior, extremity. The above 

 species, to which ours seems closely related, if not identical, is 

 not uncommon in the Silurian of Gotland. 



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



ofian 



Genus Bythocypris., G. S. Brady. 



Bythocyppis holii, Jones. (Pi. XIV., Figs 9h, b, young 

 form; PI. IV., Figs, la-c c?, Figs. 2a-c ? ). 



Bythocypris hollii, Jones, 1887. Ann. Mag. Nat. Hist., ser. 

 5, vol. xix., p. 184, pi. v., figs. 1 a, b, 2 ; nl. vi., figs. 3 a, b, 

 4 a, b. 



Observations. — ^This fine species is distinguished by its 

 smooth, reniform and nearly symmetrically ended carapace, its 

 semicircular back and gently sinuous ventral border. It is a 



1 Ann. Mag. Nat. Hist, ser. 5, vol. xix., 1887, p. 179, pi. iv., figs. 1-3 and woodcut. 



2 Rep. Chall. Zool.. pt. iii., 1880, p. 41, pi. ii., fijrs. la-f. 



