229 



outside of which is the puiictated-sulcated and 

 transversely striated anterior face of the elevated varix. 



Dimensions. — Length, 13 ; width, 3 ; diameter of aperture, 1. 

 Locality. — Eocene ; Muddy Creek ! 



11. Sealaria (Punetiseala) mierorhysa, '>7^ee. nov. 



Shell stout, pyramidal, obtuse, imperforate ; ordinary whorls 

 five and a-half, flatly convex ; suture deep, partially concealed by 

 the protuberant cost^ of the preceding whorl ; apical whorls tw^o 

 and a-half, the median portion of the pullus very tumid and 

 excentric, the tip is relatively very small and immersed. 



The spiral ornament consists of very slender, crowded, undulose 

 threadlets ; the slightly-wider linear interspaces punctatedly-im- 

 pressed. 



The transverse ornament consists of slightly-oblique, broad, 

 convex costte, extending beyond the posterior suture of the 

 anterior whorls in the form of blunt denticulations ; there are 

 about 14 costse on the penultimate whorl. The concave inter- 

 costal spaces, which are a little wider than the cost», and the 

 costa3 are transversely microscopically striated. There are no 

 varices on the spire. 



Base angulated by a broad convex keel ; the anti-peripheral 

 area flat or very slightly concave, concen rically striate, and 

 faintly radially-ribbed. Aperture oval ; peristome completed hj 

 a callous growth, but not double ; outer lip formed by a costa. 



Dimensions. — Length, 9*5 ; width, 3 '25. 



LocaUty. — Eocene. Bird-rock Blufl", Spring Creek, near 

 Geelong (J. Dennaitt, very rare). 



The subgeneric position assigned to this species is not satis- 

 factory, though the incompleteness of the aperture may merely 

 indicate an adolescent stage of growth. 



12. Sealaria (Cirsotrema) transenna, ^pec. nov. 



Shell large, elongate, stout, acute, imperforate, with 1 1 ordinary 

 moderately convex w^horls ; the nuclear whorls not known. 



The spiral ornament consists of four or Ave stout filiform lii-a^, 

 one median and one on each side of it are about equidistant, the 

 fourth is close to the third, whilst the exsert basal keel forms a 

 fifth, margining the anterior suture, there are a few smaller 

 threads on the posterior area ; the interliral spaces have three or 

 four linear sulcations separated by broad flat threads. 



The transverse ornament consists of filiform costa?, not so 

 stout as the stronger lirse, which produce slight nodulations at 

 the intersections with the lira? ; there are 25 costa? on the penult- 

 imate whorl, they are slightly oblique, equal, and equidistant. 

 The posterior slope is transversely striated. There are two stout 



