161 



narrow sulcus, otherwise smooth. The plications are slightly 

 arcuate and attenuated above and below ; becoming almost obso- 

 lete on the anterior whorls. 



Dimensions. — Eight whorls in a length of 9 mill. ; breadth of 

 last whorl, 2-5, 



Locality, — Oyster-beds of the Upper Aldinga Series, Aldinga 

 Bay. 



The specific name of this fossil indicates its resemblance to 

 Mitrella of the Columbellidae ; amongst species of which it comes 

 near to J/. Lincolnensis, but apart from the different characters 

 of the aperture, the fossil shell is more slender than juvenile 

 specimens of the living Mitrella. In respect to shape and orna- 

 ment T. ■mitrello'forinis would seem to approach to T. nana, 

 Deshayes, inhabiting off the mouth of the Indus, but that species 

 is without a sutural band. 



5. Terebra crassa, Tate. Plate ix., fig. lo. 



Reference. — Southern Science Record, January, 1886, j). 7. 



Shell subcylindrical, whorls flatly convex, slighly flattened at 

 the suture, ornamented with thick costse separated by narrow 

 angular interspaces, and interrupted at the posterior-third by a 

 narrow and deep sulcus. There are about 20 costse on the last 

 whorl. 



Dimensions. — About 10 whorls in a length of 17 mills. ; 

 breadth of last whorl, 4-5. 



Locality. — Oyster beds of the Upper Aldinga Series, Aldinga 

 Bay, South Australia. 



This species bears a resemblance to some varieties of T. clislo- 

 cata (Say), but it is narrower and more coarsely ornamented. 



6. Terebra geniculata, Tate. Plate ix., fig. 8, 



Reference.— Southern Science Record, January, 1886, p. 6. 



Shell cylindrical, many-whorled, polished ; pullus subacute of 

 three small convex turns ; whorls convex or subangulate ; con- 

 stricted around the posterior part, between which and the suture 

 there is a row of tubercles (about twelve on the last whorl) ; the 

 rest of the whorl is ornamented with distant varicose ribs, the 

 interstices being spirally striated and faintly marked with lines 

 of growth. 



The ribs are stout, subcompressed, and abruptly bent and 

 subnodose on the angle of the whorl ; they are confluent with 

 and equal in number to the tuberculations on the band next the 

 suture. 



Dimensions. — Length of 13 whorls, 12; breadth of last whorl, 3. 



Locality. — Upper beds at Muddy Creek. 



