New and Rare Fossils. 307 



in the medium area, and dense condition repeated in the ventral 

 area. The above conclusions have been arrived at after a pro- 

 longed study of the living shells above noted. 



Distribution.— Bore 1. 216-244 feet. Bore 3, 226 feet. Bore 

 4, 163-170 feet. Bore 5, 162-163 feet; 175-189 feet. 



Fam. MYTILIDAE. 



Genus ARCOPERNA, Conrad. 



Arcoperna scapha, Verco. (PI. XXVII., Fig. 16). 

 Arcoperna scapha, Verco, 1908, Trans. Roy. Soc. S. Aust. 

 vol. xxxii. p. 196, pi. xii. figs. 1-5. 



Observations. — A typical example of this species, in no wise 

 differing from the living form, occurs in the present series. It is 

 the first recorded occurrence of this genus as an Australian fossil. 

 The species is well-known as a recent form by Dr. Verco's published 

 description ; that author recording it from Beachport at 49 to 200 

 fathoms; off Cape Jaffa, 90 and 130 fathoms; off Cape Borda, 55 

 fathoms ; and oast of Neptunes, 45 fathoms, all in 8. Australia. 

 Dr. Verco's record of Mr. Hedley's report of the species in New 

 South Wales is 22 miles east of Narrabeen, at 80 fathoms. One of 

 us (C.J.G.) has obtained it off Wilson's Promontory. 



In the Dennant collection specimens labelled " Verticordia sp." 

 can be referred to this genus. They are from Brown's Creek, 

 Spring Creek and Hamilton Creek, Janjukian localities which may 

 be on the same or a lower horizon than the present specimen which 

 is associated with a mixed Kalimnan and Janjukian fauna. The 

 shells from the undoubted Janjukian localities mentioned, differ 

 however, in the stronger decussate surface ornament and rough 

 growth-lines, and probably represent another species. 



Distribution. — Bore 3, 226 feet. 



Fam. CRASSATELLITIDAE. 

 Genus CRASSATELLITES, Kruger. 

 Crassatkllites kingicoloides, Pritcliard. 

 Crassatellites kingicoloides, Pritchard, 1902, Proc. Roy. 

 Soc. Vict., vol. XV. (N.S.) pt. i. p. 94, pi. xiii. figs. 1-3. 

 IV. pt. 5, p. 315, woodcut, fig. 55. 



Up to the present this species has only been recorded from the 

 Gippsland Lakes Tertiary deposits at Jemmy's Point, It has, how- 



