Art. IX. — New or Little-known Victorian Fossils in 

 the National Museum, Melbourne. 



Part IV.— Some Silurian Ostracoda and Phyllocarida. 



By FREDERICK CHAPMAN, A.L.S., &c., 

 National Museum. 



(With Plates XIII.-XVII). 

 [Read 14th Jiily, 1904]. 



Introductory Remarks. 



The whole of these Ostracoda now first recorded for Victoria, 

 or described as new, have been obtained from the soft, friable 

 or granular portions of the pale greyish limestone of Cave 

 Hill, Lilydale. For some of this ostracod-bearing material the 

 Museum is indebted to Mr. G. B. Pritchard, whilst other samples 

 were collected by myself from the same locality. The specimen 

 of Cyprosina was collected at Lilydale by the Rev. A. W. 

 Cresswell, M.A. 



Of the 26 speciee of Ostracoda, one-half of the number are 

 forms of Primitia, a genus which, ranging from, the Cambrian 

 to the Carboniferous formations, seems to have attained its 

 maximum development in Silurian times. The other genera, 

 with the exception of Cyprosina, a Middle Devonian form in 

 England, are, generally speaking, of Ordovician and Silurian 

 ages ; whilst others are apparently referable to living genera, 

 so far as we are able to judge from the characters of the cara- 

 pace alone. 



With regard to the 17 already known species, now recorded 

 for the first time from Australia, 4 are Ordovician (generally 

 Upper) types elsewhere, 11 are from the Silurian (generally 

 Wenlockian), whilst 1 is of Lower Devonian age (in Canada), 

 and 1 belongs to the Lower Carboniferous (England). 



