100 



tions distiuguisli it. Very common at Table Cape, and in the 

 Australian Lower Cainozoic, Muddy Creek, Corio Bay, etc. In 

 the Museum there is a large block of yellow calcareous sand- 

 stone from Table Cape, principally composed of this fossil, with 

 an almost complete skeleton of a small marsupial herbivore 

 imbedded. (Macropus or Helmaturus ?) 



Tenagodus occlusus. n.s. Shell loosely twisted, the 

 three apical whorls iiP contact, the fourth slightly detached, and 

 sloping, the last largely unfolding, making a loose turn two 

 and a half times the length of the remainder ; whorls solid, 

 wrinkled or detaching upper shelly coat in flakes, underneath 

 which it is still thick, cracked, smooth, and somewhat polished, 

 rounded below but narrowing and almost angular at the cleft, 

 which is a smooth slit without punctures closed for its whole 

 length, and evidently almost filled up by lamellar calcareous 

 matter down to the aperture where it is little more than a 

 shallow notch, p3'riform and projecting below, apex disciform, 

 apical whorl vermiform and fine pointed. Lengtli, 56 lat., 

 aperture 8 mil. 



The absence of foramina and the almost closed slit dis- 

 tinguish this from all known Australian forms. The cleft is 

 much more narz'ow and inconspicuous than the size of the 

 shell would lead one to suspect, and its being reduced to a 

 notch in the aperture. It is supposed that the slit is left 

 open for the purpose of bathing the gill which lines the left 

 side of the mantle, which, in this animal, is divided. It 

 cannot, however, be so necessary where the aperture slopes 

 forward from the notch. The slit is not, in this case, entii'ely 

 closed, for the tube, when broken below it, separates at once 

 at the fissure, and shows a fine delicate edge at the point of 

 junction. 



Veemetus conohelix. n. s. Tube adhering, corrugated, 

 coiled, lower whorls, laterally depressed into a ridge and 

 coiled upon each other with a truncated flattened hollow 

 cone of two whorls, at the apex the tube becomes free, 

 obliquely erect, flexuous and cylindrical, aperture somewhat 

 thick and orbicular. Height of cone, 3 ; breadth, 6 ; length of 

 free end, 5 ; aperture, 1, mill. wide. 



I am unacquainted with any form like this either in Aus- 

 tralian seas or elsewhere, as far as I can gather from 0. 

 Morch's extensive lists. 



RissoA STEVENSiAisTA. U.S. Shell miuute, narrowly pyram- 

 idal, nucleus somewhat suddenly contracted of two smooth 

 turbinate whorls, spire slightly tumid in the middle ; whorls 

 ten, angular or sub-carinate in the middle, coarsely costate, 

 from 12-16 ribs on each whorl, and finely but indistinctly lirate, 

 ribs rounded, not much elevated and continuous from suture 



