330 



Hipponyx australis, LamarcL 



H. australis, Quoy and Gaimard, op. cit., p. 4-34, pi. 72, tigs. 

 25-34. 



Differs from H. antiquatus by its broadish flat radiating ribs 

 ribs separated by narrow interstices. 



Habitat. — ^Miocexe : Hallett's Cove, St. Vincent Gulf ! ; and 

 Muddy Creek ! Newer Pliocene : Limestone Creek, Dartmoor 

 (J. Dennant ! ). Recent : Australia, New Zealand, ifec. 



FAMILY CALYPTR.EID.E. 



Genus Crepidula. 



synopsis of species. 



Apex terminal. 1, unguifonnis. 



Apex submarginal. 2. diihitahilis. 



Apex posterior, but distant, hooked. 3. JIainsicorthi. 



1. Crepidula unguiformis, Lamarck. 



Id., Reeve, Conch. Icon., lig. 1. 



Forma tyj/ica. — Upper surface flat or concave. 



Habitat. — Miocene, Gippsland I. Fossil specimens have been 

 compared with living examples from east coast of N. America 

 <ind from Southern Australia. [Also Pliocene, Wanganui, ifec, 

 New Zealand. Recent, almost cosmopolitan.] 



Forma conve.ca. — (Syn. C. immersa, Angas). Upper surface 

 convex. 



Habitat. — Eocene : Muddy Creek ! ; Cheltenham I ; Table 

 Cape 1. Recent : South Australia, vfcc. 



Forma infiata. — (Syn. C. inonoxyla, Lesson). Upper surface 

 very convex ; resembles C. fornicata without radial ridges. 



Habitat. — Eocene : Muddy Creek I. Miocene : Muddy Creek 

 (specimens faintly ridged) !. Newer Pliocene : Limestone Creek 

 (J. Dennant .' ). Recent : New Zealand, and also in Pliocene 

 strata at Wanganui, Petane, tfec. 



2. Crepidula dubitabilis, xpec. nov. PI. ix., fig. 5. 



Shell like C. mono.i'yla, but the small spiral apex is narrowly 

 separated from the margin. It, however, varies from convexedly 

 depressed to moderately inflated. 



Dimensions oi a medium specimen: — Length, 25; width, 16; 

 height, S. 



Localities. — Eocene : River Murray Cliffs ! ; Mornington ! . 

 Miocene : Gippsland lakes ! 



3. Crepidula Hainsworthi, Johnston. 

 Rcf. — Proc. Roy. Soc. Tasmania for 1884, p. 333, flgs, a-c, 

 1885; id., Geol. Tasmania, t. 32, f. 13, 1888. 



Basal outline oval, narrowly and abruptly arched laterally. 



I 



