Palceoniolocjy of Older Tertiary of Victoria. 109 



well-marked angulose ribs. The fine spiral thread-like orna- 

 ment commencing with the wrinkles. 



In addition to tlie above, there are about three strongly 

 shouldered whorls bearing narrow, oblique, forwardly-directed 

 costie, the number of which is somewhat variable, ranging from 

 twelve to sixteen or seventeen on posterior whorl, to about four- 

 teen to twenty-two on the body whorl. At the shoulder the 

 costtie are very prominent and abruptly angled, but fade out 

 rapidly before reaching the suture, and at the same time are 

 forwardly directed in conformity with the lines of growth ; on 

 the anterior slope of the body-whorl the costse are slightly 

 forwardly arched, crossing the lines of growth at an acute angle, 

 while, towards the notch they become backwardly arched as they 

 gradually fade out. The concave interspaces between the costse 

 are usually broader than the costte, but in the more closely 

 costate forms the spaces are very slightly, if at all, wider than the 

 bi'eadth of the ribs. Earlier whorls closely spirally threaded, 

 tending to become obsolete anteriorly, till on the body-whorl a 

 few threads can sometimes just be detected near the suture. 



Aperture ovate, with a somewhat thickened and reflected outer 

 lip, slightly ascending the penultimate whorl, and most strongly 

 efi"use or reflected posteriorly, giving the appearance of a small 

 almost wing-like expansion. Columella rather strongly twisted 

 and bearing about its middle three thin oblique plaits. Outer 

 lip falls considerably shorter than the end of the columella ; the 

 aperture at the anterior end being relatively very broad and open. 



Dimensions. — -Length of shell, 69 mm. ; breadth of shell, 33 

 mm. ; length of aperture, 44 mm. ; breadth of aperture, 15 ram. 



Locality. — Eocene beds of Muddy Creek, Western Victoria. 



Observatiotis. — This form is very distinct from any of our 

 previously described species of this genus, and it afibrds me much 

 pleasure to name it after my friend Mr. J. H. Gratliff", in recogni- 

 tion of his long and careful work amongst our living Victorian 

 Mollusca. 



Voluta pueblensis, sp. nov. PI. VII I., Fig. 7. 



Shell regularly fusiform, with an acute spire about one-third 

 the length of the shell, terminated by a bluntly convex embryo 

 of about two smooth whorls, which are enrolled in the same 

 plane as the spire whorls, and with a centrally immersed tip. 



