283 



Besides the above I have identified a good miiiy othoi's with 

 more or less certainty. In the foraminii'era-roclcs I have come 

 across the following among others 



Periphseria decora Halioma oculatum 



S ion'TDsphaera rhibdostyla Lithocyclia ocellus. 



I have not done more work in the identification of the 

 radio'.aria an.l diatoms partly on account of the difficulty already 

 mentioned of isolating and mounting them and partly on account of 

 the unscientitic way in which they have been named. What are 

 evidently merely individual forms have been described as genera 

 and species. There is little satisfaction therefore in working at 

 the nomenclature of these organisms until some one undei'takes 

 the task of its revision and simplification, in fact to do for this 

 subject what Parker, Jones and Brady and Carpenter have done 

 for the Foraminifera. 



A> regirds the Foraminifera which constitute the most im- 

 portant element of this Microzoic fauna and the one I am best 

 acquainted with, I have introduced some slight changes from my 

 former paper. A few names I was not quite sure of have been 

 omitted including some forms of doubtful validity and a few 

 I have since discovered have been added. There are still some 

 whose affinities are undetermined. Of the fcms whose names 

 are given there are soine which are marked varieties or bhow 

 constant differences from the types and these may probably here- 

 after receive distinctive names. The foraminifera of the radio- 

 larian marls are generally poor and small examples. 



Several of the Microzoca are of limited occurrence and very 

 few indeed pass throughout the series. Olobigerina occurs most 

 abundantly in all the beds except the shallow water ones, namely 

 the Oibitoides and Amphistegina beds and the Ally creek shell- 

 bed. The Nummuline forms (Orbitoides, Nummulina, Heteros- 

 tegina, Amphistegina and Tinoporus) are confined to these beds. 

 The following occurred each in a single sample of rock from the 

 Globigerina beds ; Anomalina polymorpha, A. anomala. 



The following are also of very restricted occurience though the 

 first three are tolerably abundant in the beds in which they occur. 



Miliolina (several forms) 



Amodiscus incertus, A charcides 



Discorbina bertheloti ^ 



Pulvinulina menardi v Very rare. 



* Nonionina (one or two species) j 



Another very rare form is one I have not yet determined — 

 this is like a Glandulina in shape but appears to unite some of the 

 characters of Lagena and Miliolina (Biloculina). I do not say, 

 however, that it really combines the characters of those groups. 



