Xeiv or Litfle-l'iioirn Vlcforiav Fossils. 309 



I have named this species after tlie duyen of workers on the 

 fossil Ostracoda, Professor T. Rupert Jones, F.R.S., and who first 

 imparted to me an interest in this group of fossils. 



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

 gian). 



Family Cypridae. 



Genus Argiiloecia, G. O. Sars. 



Apgilloecia acuta, Jones and Kifkby. (PI. XV.. Figs. 6a-c). 



Argilloecia aequalis, var. acuta, Jones and Kirkby, 1895. 

 Ann. Mag. Nat. Hist., ser. 6, vol. xvi., p. 457, pi. xxi., fig. 8. 



Observations. — Both the above species and the variety were 

 originally described from the Lower Carboniferous Limestone 

 series of Yorkshire and the Lake District of England. Our 

 specimen is indistinguishable from the variety acuta in every 

 particular, so that for the present we may regard it as a form 

 that has persisted throughout Devonian times. The so-called 

 variety is here recorded in the specific sense, as it seems suffi- 

 ciently distinct from A. aequalis,^ and is, so far as we know, the 

 older form, judging from the present occurrence. 



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

 gian). 



Family Bairdiidae. 

 Genus Macrocypris, G. S. Brady. 



Macpocyppis flexuosa, sp. nov. (PI. XIII., Fig. 6). 



Description. — Carapace, elongate, siliquate and flexuose ; 

 seen from the side, highest in the middle ; dorsal edge boldly 

 rounded in the centre, and concave at both ends ; ventral mar- 

 gin strongly convex in the middle, sloping gently to the 

 acuminate anterior extremity ; posterior end probably much 

 attenuated, but partly wanting in oiu- specimen. Edge view 

 elongate-ovate with compressed and attenuate extremities. 



Dimensions. — Length of carapace when perfect, about 2.07 

 mm. ; greatest width, .64 mm. ; thickness, .46 mm. 



1 Jones and Kirkby: .\nn. Mag-. Nat. Hist., ser 5, vol. .wiii., 1886, p. 263, pi. ix., 

 figs. 6a, b. 



