154= 



Localities. — Upper beds at Muddy Creek ; oyster banks^ 

 Aldinga Cliffs. 



This fossil, thougli not a typical Ferisfeniia, cannot well be 

 included under Troplion to which its living analogue P. Paivcs 

 was originally referred, 



Mr. Boog Watson, Zool. Challenger Exped., pt. xlii., p. 194f, 

 1886, writing of Tf^oplwn HanJeyi, which Mr. Tryon regards as 

 an elate form of T. Fnivce, Crosse, says : — " The operculum of 

 this species is not that of Murex nor of JFicsus, still less that of 

 TJrosalpin.v. . . The form of the shell and operculum alike 

 remove it from TropJion.'" In his perplexity he classes it as a 

 Fusus. As regards the shell T. Faivce is congeneric with 

 Siphonalia fiiscozonata, Angas, which Tryon places under 

 I*eristernin — a position the least objectionable. 



Perisfernia PaivcB is a variable shell, botb as to shape of 

 whorls and length of spire, so also is its fossil representative, 

 and specific differences are not easily definable so as to em- 

 brace every individual variation of each. In the living species 

 the whorls are tabulated, and the length of the aperture and 

 canal does not exceed that of the rest of the shell ; in 

 P. approximans the whorls though angulated are not tabulated, 

 and the length of the aperture and canal is about half as long 

 again as the rest of the shell. 



2. Peristernia purpuroides, spec. nov. Plate is., fig. 3. 



Shell fusiform, stout, whorls seven, apex small, mamillate. 

 "Whorls convex, a little contracted at the anterior suture, the 

 posterior whorls faintly transversely ribbed ; ornamented with 

 thick spiral lirae, about nine on the posterior whorl, interstices 

 much narrower than the lirae, and transversely striated. 



Aperture oval ; outer lip strongly lirate within, with a 

 strong fold at the front ; inner lip patulous, callously expan- 

 ded, decurrent on the pillar, which is bounded on the left by a 

 narrow angulated furrow ; there is a strong oblique fold arising 

 from the point of the pillar ; canal rather short, stout, and 

 broad, bent to the left, and slightly reverted. 



Length, 29 ; breadth, 14 ; length of aperture ll'o, of canal 6. 



Localiti/. — Tipper beds at Muddy Creek (J. Dennant !) . 



The fossil recalls some varietal forms of 'Purpura lapillus, 

 but its canal and plaited columella remove it from that genus ;. 

 its affinity to Peristernia approximans is unquestionable, though 

 not likely to be confounded with it. 



3. Peristernia Morundiana, sipec. nov. Plate viii., fig. 7. 

 Shell ovately fusiform, stout, of seven flatly convex whorls 

 of rather rapid increase, with a rather short conic spire ending 

 in a small mamillate apex of two smooth whorls ; the anterior 



