107 



attention to tlie fact of the smooth ahuost turbinate apex 

 which most of the Plourotoma family had in the Australian 

 cainozoic period. In this respect thej seem to be distiufiruished 

 at once from living forms and European tertiai-y fossils. 



BucciifUM FRAGILE, n.s. Shell ovatclj fusiform, turrcttcd, 

 extremely thin and fragile, spire acute, apex naticiform of two 

 whorls; the whole shell lii-ate with raised liros which are 

 alternately large and small, and about three on each whorl 

 become nodose keels. These are cancellated by much finer 

 longitudinal lines ; whorls 6-7, rather globosely convex, and 

 angulate above, the upper ones with solid ribs, which disap- 

 pear on the body whorl which is multicarinate, suture deeply 

 impressed, but not canaliculate ; aperture broadly ovate, outer 

 lip very thin, with a smooth inner margin, within which there 

 rises a number of small, raised, polished lirte which have a 

 tendency to run in pairs ; columella short, and spirally 

 much twisted, but not enamelled ; canal short, and scarcely 

 reflected. Long. 17, Lat. 10. Long, of aperture, 8, Lat. 5. 



This is a very common fossil and widely distributed as I 

 have seen it taken from most of the Lower Tertiary beds of 

 Australia. It has many representatives of its peculiar type 

 among European tertiary fossils, but none living or fossil of 

 such a fragile character which gives it a marked specific 

 distinction. B. tenerum, Sow., is a very fragile form of B. 

 nndatiim found in the Eocene beds of England and Belgium, 

 but in that well-known and much larger species the shape is 

 diiierent, and the whorls obliquely ribbed. 



Teiton minimum, n.s. Shell small, somewhat solid, 

 ovate, with a naticiform obtuse, smooth, white shining apex of 

 nearly four whorls ; whorls 7-8, with numerous raised rather 

 broad lirre, sometimes alternating large and small ; interstices 

 about twice as wide, and closely, elegantly, striate at right 

 angles with very fine lines, which do not appear to pass over 

 the spiral lirce ; spire regularly costate near the apex, the plait 

 disappearing for the two last whorls, though some of the lirse 

 are slightly nodular ; varices much raised and lirate ; mouth 

 broadly oval, outer lip projecting beyond the varix and undu- 

 late, prominently dentate ; inner lip only slightly inflexed, 

 and oblique, about half the length of the aperture ; second 

 varix on a line with the columella. Long 11, Lat. 5. 



There is a small fossil of this genus in the Vienna Miocene, 

 T. parvuhim, Michl., but it is larger than the foregoing, and is 

 distinctly ribbed throughout. Our existing T. quoi/i is also 

 small, but the size of the present fossil at once distinguishes it 

 from all known species, fossil or recent. 



CoMiNELLA CANCELLATA. U.S. Shell solid, imperforate 

 ovally pyramidal, costate and lirate : apex subacute, smooth ; 



