Older Tertiary of Victoria. 93 



30 by 17,; U by 30 by 18; 33 by 28 by 18, for the above 

 ineiisurenients respectively. 



Locality. — Lower beds of Muckly Creek, Western Victoria. 

 Balcoml)ian, — Eocene. 



Observations. — -Mr. R. Etheridge, jun.,^ in his paper on a 

 representative of this species from a depth of about six hundred 

 and forty-seven feet from the Arumpo bore, east of the Darling, 

 in the County of Wentworth, New South Wales, draws attention 

 to some important points in some Muddy Creek examples of this 

 species which he examined, and remarks on some discrepancies 

 with McCoy's description. It must be borne in mind, however, 

 that McCoy figured and described his specimens from the Spring 

 Creek section. McCoy speaks of "faint impressed sulci radiating 

 from the beak to the ventral margin," and it would be difficult to 

 otherwise describe the Spring Creek forms. Etheridge, however, 

 states, " but in the specimens examined by me, these are not 

 sulci, nor are they continuous, but rather a timbriation of the 

 lower margin of each concentric ruga, and these being placed 

 directly under and above one another in line, give rise to the 

 appearance of sulci, until closely examined." This offers rather 

 good independent confirmation of my treatment of the above, and 

 so strengthens the case that the Muddy Creek examples might 

 almost be regarded as a distinct species, but for the pi'esent a. 

 varietal distinction appears to me to meet requirements. The 

 Arumpo bore specimen, judging from Mr. Etheridge's particulars, 

 would appear to represent the Spring Creek form. 



The Table Cape specimens represent the typical Spring Creek 

 form. 



From Wilkinson's No. 4 locality. Aire Costal sections, the 

 specimens are of the Spring Creek type. 



From Lake Bullen Merri, near Camperdown, the specimens are 

 of the JNIuddy Creek type, var. lutosa. 



Crassate Mites maudensis, sp. nov. (PI. XIV., Figs. 2, 3). 



Description. — Shell elongate, oblong ovate, somewhat depressed, 

 and bearing a strong angulation from the umbo to the post- 

 ventral margin, the posterior area thus marked off being much 



1 Records Geo. Surv. N.S.W., vol. iii., pt. iv., p. 117, 1893. 



