394 ‘RALPH TATE. 
Genus Borsonia. 
Sinus near the suture, columella plicate, canal long. 
BorsoNIA PROTENSA, spec. nov. (Plate 19, fig 6.) 
B. protensa, Tate, m.s." 
Shell narrowly fusiform ; aperture about equal, more or less, to 
the spire in length. Embryo globulose of one and a-half smooth 
whorls, the tip small somewhat depressed and lateral. Spire- 
whorls eight, the first five roundly costated below the fascial band, 
most markedly so on the third and fourth whorls, the costation 
gradually fading away with the revolution of the spire and the 
whorls becoming more flatly convex. All the spire-whorls closely 
spirally lined, and more coarsely so transversally. Last whorl 
ornamented as the penultimate, but with close-set threadlets on 
the att ted front portion. Aperture narrow elliptical, narrowed. 
in front into a long straight widish snout, just perceptibly twisted 
to the right at the tip. Columella straight, with two stout 
approximate oblique plications, just behind the base of the snout. 
The fascial band is broad and indicates a shallow sinus at the 
suture. Length 44, breadth 11 mm. 
Eocene, Cape Otway, Victoria. 
This species is very typical of the genus, simulating the long 
snouted species of Surcula, but having a slightly different embryo 
and a biplicated columella. 
Borsonta OrwayYEnsis, spec. nov. (Plate 19, fig. 4.) 
B. Otwayensis, ms. op. cit., id. Cossmann.” 
Shell fusiform, aperture slightly longer than the spire ; embry 
as in B. protensa. Spire-whorls seven, angulated post medially 
and broadly costated on the anterior slope (sometimes obsolete 0 
the body-whorl), there are about eight on the penultimate whorl. 
All the spire-whorls sculptured with spiral threads (increasing to 
about twenty), crossed by slightly arcuate finer threads. Aperture 
trapezoidal-elliptic, widest behind, narrowed in front into 4 
cee 
1 Trans. Roy. Soc., S. Aust., 1893, p. 111. 
2 Essais’ Vol. r1., p. 98, (fig. 17 of embryo). 
