W. H. Hudleston — Fossil Shells from South Australia. 243 



This species occurs in black argillo-calcareous nodules at Primrose 

 Springs. Some of the nodules are full of interior casts, with 

 portions of shell substance adherent, but no casts of the exterior or 

 of the appendages are available at present. Accurate diagnosis and 

 strict comparisons are therefore difficult. 



No species of Alaria is enumerated in Moore's "Australian Mesozoic 

 Geology"; but Mr. Etheridge, jun., figures Anchura Wilkinsoni 

 (Queensland Pal. pi. 31, figs. 4: and 5), which is shorter, possesses 

 a wider spiral angle, and has more slender costas on the carina of the 

 whorls of the spire than is the case with our species, which I con- 

 sider to be different. On the other hand, our species presents many- 

 points of resemblance to Anchura carinata, Mantell, of the Gault. 

 Indeed, if they are not the same species, they are very closely allied ; 

 and as I only have access to a cast of the one and to shells of the 

 other, a true comparison is impossible. If we had any evidence of 

 the securiform termination of the wing in the Australian fossil, I 

 should be almost disposed to pronounce in favour of its identification 

 with Anchura carinata. 



Turbo ? sp. Plate IX. Fig. 3. 



The length is about 20 mm. ; width rather more, and the spiral 

 angle nearly a right angle. The shell is turbinate, and has three or 

 four whorls, which increase regularly, and do not, as far as may be 

 judged from the cast, present any marked tabulation. Portions of 

 the different shell-layers are preserved, the inner ones exhibiting a 

 considerable amount ' of nacre. There are no certain indications 

 of external ornament, though the general aspect might suggest a 

 smooth exterior. Traces of a sutural canaliculation are also visible. 

 The aperture is imbedded in matrix, but appears to be circular. 



But for the apparent depth of the sutural canaliculation and its 

 larger size, the general aspect of this shell suggests that it belongs to 

 the group of " Turbo," which is characterized by Turbo (Nerita) 

 Iwvigatus, Sow., and which group has been likewise successively 

 referred to Monodonta, Chrysostoma, and to Alaphrus, Gabb. It may 

 be worth noticing that Turbo Icevigatus was enumerated by Moore 

 from the Greenough district in West Australia. 



A single specimen is known from Primrose Springs. 



Action or Avellana, sp. PI. IX. Fig. 4. 



Length 6-| mm. ; body- whorl about four-fifths of the total length ; 

 spire subdepressed, and consisting of about three whorls, increasing 

 under a wide angle. Body-whorl relatively very large, and more 

 ventricose posteriorly than in front. The ornaments consist of 

 regular deep-set punctate furrows, spirally arranged, which leave 

 their impress on the cast of the body-whorl, where they are about 

 twenty-four in number. Aperture broadly ovate, and about two-thirds 

 the length of the shell. Columella much excavated, and showing 

 on the cast the mark of one fold situated anteriorly. Other indica- 

 tions wanting. 



There being no shell whatever on the body- whorl, it is difficult to 

 fix the genus with certainty. The general aspect of the cast, and 



