170 Frederick Ghajwian : 



represented by the Muddy Creek lower beds (Bak-oinbian), for it 

 is associated in Bore 4 Avith some undoubted Kalinin an forms, as 

 Bafhyactis beaumariensis. although the remainder of the fauna at 

 163-170 feet is essentially Janjukian. 



The example figured above resembles M. vulgaris in contour, 

 whilst others are nearer M. iricarinafa in outline, the species being 

 much subject to variation. 



Distrihutio7i. — Bore 2. 211-240 feet, very common. Bore 3^ 

 about 260 feet. Bore 4, 163-170 feet. Bore 11, 267-270 feet. 



Genus ORBITOLITES. 

 Orbitolites complaxatus, Lamarck. 



OrhitoIife>; cotnpld/iaf us, Lamarck, ISOl, Syst. Anim. sans- 

 Vert., p. 376. Carpenter, 1856, Phil. Trans., p. 224, 

 pis. iv-ix. 

 Observations. — As a fossil this species has been previously re- 

 corded from Victoria by Mr. Howchin, as rare at Muddy Creek 

 (lower beds; Balcombian); it has also occurred in the Govt, well- 

 boring in the Murray Flats. South Australia. 0. complanata, as 

 remarked by Mr. Howchin. w'as living on the South Australian 

 coast to Nvithin Pleistocene times, but is now extinct in that area. 



Disfribufio/i.—ln the present borings this species is of common 

 occurrence, and seems mainly confined to the greensand and 

 phosphatic deposits of tlic Janjukian and Kalinnian series. 



Fam. LITUOLIDAE. 



Genus AMMODISCUS, Keuss. 



Ammodiscus ova MS, sp. nov. (Plate XVI., Figs. ~i«, b). 



(?) A7)i>nodisrus sp.. Chapman and Howchin, 1905, Mem, 



Geol. Surv. New South Wales, Palaeont. No. 4. Foram. 



Permo-Carl). Limestones of New Soutli Wales, p. 11, 



pi. i., figs, i'la-c. 



Description. — Test composed of fine arenaceous mud, consisting 



of a depressed, sparsely-coiled shell, elongated in one direction to 



form an iri-egular oval. Thinner in the centre than at the 



periphery. 



Dimensions. — Longer diameter. .6!!-' imii. : slioiter diameter, 

 384 mm. Thickness, cir., .(»77 nun. 



Observations. — The examples doubtfully referred to the genus 

 Ammodiscus by Mr. Howchin and myself, from the Carbopermian 



