341 



Aperture quadrately oval, continuous; outer lip with a deepish 

 subtriangular median sinus. 



The sectional outline of the whorls varies from flat or slightly 

 concave to somewhat quadrate, and correspondingly in the depth 

 of the suture ; the ante-medial keel is sometimes obsolete, l^ut 

 the medial depression is always present. 



Dimensions. — Length, 60; breadth, 17; height of last whorl, 

 12. 



LocoJities. — Eocene : River Murray Cliffs (very abundant !) ; 

 Muddy Creek I ; Corio Bay, near Geelong ! ; Mornington ! ; 

 Oellibrand River ! ; Belmont ! ; Table Cape (R. M. Johnston .' ). 

 Miocene : Gippsland Lakes (rare I). 



T. Murrayana has resemblance to T. decHvis, Ads. ct Reeve, 

 but has not the backward-slanting whorls of that species, which 

 is apparently without a conspicuous sinus in the outer lip. It 

 has also much resemblance to 7\ rosea, Quoy it Gaimard, but in 

 that the spiral ornament of the posterior whorls develop into 

 ribs on the anterior whorls. 



The Table Cape specimens have usually flattish or slightly 

 concave whorls with or without the anterior keel, but fall within 

 the limits of variation exhibited by the Murray examples, though 

 they are usually broader in proportion- — the apical angle being as 

 much as 18' 



11. Turritella platyspira, Teniyon- Woods. PL viii., tig, 9. 



Bef.—Fvoc. Lin. 8oc. ^^.S.W., vol. Ill, p. 23-4, t. 20, f. 13, 1878. 



Shell acutely pyramidal-turreted, thin, polished ; spire subulate- 

 attenuated, ending in a nucleus of two very small rotund turns. 

 Whorls fifteen, the posterior ones flat, the anterior ones slightly 

 convex ; ornamented by three inconspicuous (sometimes obsolete) 

 spiral threads, which are equidistant from each other and from 

 the sutures, the interstices faintly spirally striated ; a shallow 

 sulcus separates the anterior thread from the medial one ; incre- 

 mental lines deeply flexuous, hardly visible. 



Aperture subquadrangular, base flnely concentrically lined. 

 Length, 13 ; width, 3-75. 



Localities.— Eocene : Muddy Creek ( Tenison-Woods .' ) ; River 

 Murray Cliffs 1 ; Gellibrand River ! ; Fyansford 1 ; Mornington !. 



T. platyspira resembles T. congelata, Ads. &. Reeve, but that 

 shell seems to be wanting in the deep sigmoidal growth-lines. 



Genus Mesalia. 

 Mesalia stylaeris, ^pec. nov. PL ix., fig. 2. 

 Shell minute, thin, and pyramidally turreted, with a mucronate 

 apex ; pullus cylindric of four narrow convex whorls ; spire- 

 whorls Ave, convex or subangulated medially, ornamented by 



