170 



Inner lip with a large rugose callus ; outer lip dentate, not 

 variced externally (subg. Niotha). 3. iV^. suhlirella. 



1. Nassa Tatei, T. Woods. Plate xii., fig. 9. 



I^assa Tatei, Tenison Woods, Proc. Lin. Soc. N.S.AV., vol. iii., 

 p. 230, t. 21, fig. 13, 1S78 ; id. vol. iv., t. 2, f . 2, 1879. 



Shell ovate or elongate-ovate of eight regularly increasing 

 whorls ; apex mamillate of four smooth regular whorls ; the 

 rest of the spire whorls regularh^ convex, with an impressed 

 suture, cancelhited with sharp raised costn? and flat spiral lira© 

 granulated at the intersections. There are about 15 to 20 

 costae on the penultimate whorl, but rapidly diminish in num- 

 ber posteriorly ; there are seven principal lirse on the penulti- 

 mate whorl, sometimes with a thread in one or more of the 

 interspaces, the two contiguous lirae next the suture are usually 

 less stout than the rest. 



Aperture oblong-ovate, the outer lip being narrowly trun- 

 cate at the front. Outer lip with a marginal varix, but elong- 

 ate examples, such as figured by me, have a varix at or about 

 in an alignment with the columella, inner lip expanded and re- 

 flected with a conspicuous posterior plait, and one or more 

 rugosities at the front. 



Length, from 7-5 to S'S ; breadth, S'o. 



Localities. — Lower beds, very rare in upper beds, at Muddy 

 Creek ; Gastropod-bed of the Eiver Murray Cliffs, near Mor- 

 gan ; blue clays at Schnapper Point, Port Philip. 



This species is the fossil analogue of N. compacta, Angas, 

 which is the Australian representative of the European 

 iV. incrassata. N. Tatei is more elevated, has numerous and 

 finer costulations than AT. compacta, and moreover has a large 

 puUus of four whorls, and not of two. Professor Hutton in 

 Proc. Lin. Soc., IS^.S.W., 1886, p. 481, has referred his 

 AT. socialis to this species ; but the two shells are distinct ; the 

 JN'ew Zealand fossil has the whorls chanelled at the suture, and 

 has usually only four lirae on the penultimate whorl, of which 

 the one next to the posterior suture is small ; other less con- 

 spicuous distinctive characters are present. 



The illustration of this species by Mr. Woods on plate 21, 

 fig. 13, op. cit., is very imperfect, but that on plate 2, fig. 2, op. 

 cit., very well represents an exceedingly immature shell. The 

 figure accompanying this description is that of a senile ex- 

 ample of rather unusual length. 



2. Nassa crassigranosa, spec. nov. PL xii., figs. 6c, 6&. 

 Shell stout, ovately conical ; spire regular (except in senile 

 examples) of rapidly decreasing subgradated whorls ; apex acute, 

 of two smooth minute whorls. Whorls 7 ; the ordinary spire 



