102 Prof. F. M'Coy on a Tertiary Pleurotomaria. 



nent thread-like spiral strias, rather less than their thickness 

 apart (about ten or eleven above and the same number below 

 the band), about three slightly smaller on the band, reticu- 

 lated by arched strias, narrower, but nearly as prominent, and 

 slightly further apart than the spiral ones. Length about 

 2 inches 9 lines ; proportional width -fife ; length of last 

 whorl tVo. 



Pleurotomaria tertiaria, M'Coy. 



Kare, in a hard yellowish limestone like lithographic stone, 

 about 2 feet thick, interstratified with the upper part of a bed 

 of older basalt about 100 feet thick, on east bank of Moorabool 

 river, near Maude. 



If this fossil had been found alone, or if the other fossils 

 found with it had not proved the Upper Miocene Tertiary age 

 of the stratum, it would in all probability deceive any geologist 

 into the belief of its affording evidence of Oolitic strata at 

 this place. 



