Foraminifera and Ostracoda. 11>9 



the tendency of the chambers to overlay one another at the 

 sutural lines, whereas in T. lobatula the separate chambers are 

 more inflated. 



Occurrence. — One specimen ; Jurassic, Greenough River dis- 

 trict, West Australia. [2148.] 



Super-order OSTRACODA. 



[All the following genera belong to the Family Cytheridae\. 



Genus Cythere, Miiller. 



Cythere dpupacea, Jones, var. fortiop, var. nov. 

 (Plate XXIII., Figs. 3, Za, U. 



Remarks. — The type species was described by Professor Rupert 

 Jones^ from the boring at Richmond, Surrey, England, at a 

 depth of 1205 feet, in a stratum of calcareous aiarl referred by 

 Professor Judd to the great oolite. It was also found in the 

 Bargate beds (neocomian, with possibly older, derived, fossils) of 

 Guildford, Surrey. 



Description. — The present variety, although closely approxi- 

 mating to the type species in general shape, differs in the 

 modified ornament of the valves which, instead of consisting of a 

 series of concentric wrinkles as in the tyjDe form, has a concen- 

 tric series of pittings, which pass from the nearly circular in the 

 median area to linear and parallel excavations nearer the margins, 

 especially near the ventral and posterior borders. In our specimen 

 the anterior flange is corrugated by a few divergent and flattened 

 ridges. The ventral aspect of the carapace is roundly ovate and 

 tumid in the posterior third. The end view is cordate. Length of 

 specimen figured, 0.62 mm.; greatest height, 0.36 mm.; thickness 

 of carapace, 0.36 mm. The valves were invariably found united. 



Occurrence. — Rare; Jurassic, Greenough River district. West 

 Australia. [2149]. 



Cythe^^e lob u lata, sp. nov. (PI. XXTIL, Figs. 4, 4«, ^b.) 



Specific characters. — Valves, seen from the side, sub-quadrate, 

 narrowing towards the posterior extremity. Highest in tl^ 



7^6- -^ 



1 Quart. Journ. Geol. Soc, vol. xl., 1884, p. 772, pi. xxxiv., fig. 30. X-v\'/v%08 iU ^ -v 



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