322 



Localities. — Miocexe, Hallett's Cove (very rare). Older 

 Pliocene, Dry Creek-bore (very common). 



This species has much resemblance to a young X. conica, but 

 by its umbilicus is more akin to iV. siihvarians ; the sculptured 

 band in front of the umbilicus is a prominent distinctive feature. 

 6. Natiea subvarians, ><pec. nor. pi. vi., figs. 8, 10. 



T apply tins name to a shell, related to iV. varians, but not 

 connected with it by intermediate grades, from which it is dis- 

 tinguished by it elongate-oval outline and produced spire. From 

 the recent N. conica, it is separable by its regularly-convex 

 whorls, more open umbilicus with distinct funiculus. Fig. 6 

 represents a short spired variety. 



Dimensions. — Length, 24 ; width, 17 ; length of aperture, 13. 



Localities. — Eocene, Cheltenham (very rare) I ; Miocene, 

 Jemmy's Point and Cunningham, Gippsland ! ; Hallett's Cove, 

 and Aldinga Bay !. 



7. Natiea varians, xp^c nor PL vi., figs. 2, 9. 



Shell solid, globulose-oval to pyriform-conic ; spire very short, 

 obtuse ; whorls five, of rapid increase, suture concealed ; last 

 whorl very large and ventricose, usually, at least in the Mudd}- 

 Creek specimens, slightly depressed on the back. Surface smooth 

 and shining, ornamented with growth-lines and close reticulate 

 stride, the spiral stride somewhat wavy. Umbilicus of moderate 

 size, funiculus narrow, terminating on the columella in a 

 moderate-sized callosity : columella thick, largely and thickly 

 spreading posteriorly and over the hinder part of the umbilicus ; 

 the posterior callosity separated from tlie funicular callosity by a 

 notch. 



Dimensions. — (a) fig. 3. Length, 40 ; width, 32 ; length of 

 ajDerrure, 31-5; width, 17. (b)nii,. 4. Length, 41*5; width, 

 36 ; length of aperture, 36 ; width, 18-5. 



Actual dimensions fail to convey the variability in shape pre- 

 sented by this species ; but I have figured two somewhat extreme 

 forms. 



Localities. — Miocene (a common fossil) ; Jemmy's Point and 

 Cunningham, Gippsland I ; Muddy Creek ! . 



Remarks. — F. varians has resemblance to N. Foiuisiana, 

 J\\ effusa, JV. intermereta, iV'. unimacidata, and some other 

 Mammce of the Noi'th Pacific shores ; the variation in shape and 

 length of spire would permit of attachment to several of the 

 above, but viewed in its composite character it appears to be dis- 

 tinguished by the fine reticulated ornament. 



8. Natiea Wintlei, TenUon- WoocU. 



Proc. Roy. Soc, Tasmania for 1875, t. 1, fig. 3, 1876. 



Shell shining, stout, ventricosely subglobulose, umbilicated. 



