110 



Aperture roundly quadriingular ; outer lip varicosely 

 iliickeued aud expanded, sometimes tuberculated witliin. Canal 

 short, mucli curved to the left and reverted. 



Length, 5"5 ; breadth, 2*5 ; length of aperture and canal, 2. 



Locality. — Lower beds at Muddy Creek. 



2. Trophon brevicaudatus, spec. nov. Plate ix., fig. 9. 



Shell elongate, fusiform, almost tarriculate, stout, with a 

 produced spire, terminating in a subacute apex of two and a half 

 smooth rounded whorls. AVhorls below the apex, four, angu- 

 larly curved in behind the anterior suture, and ornamented by 

 narrow, angular, distant, subnodulose costse, about 10 to a 

 ^vhorl ; and by two strong lir?e at the angulation and a thread 

 at the anterior suture. Last whorl bluntly angled, faintly 

 spirally lirate on the posterior slope ; seven liras on the rest of 

 the surface extending to the beak ; varicosely dilated behind 

 the aperture ; base abruptly contracted into a short, broad, 

 slightly oblique and reverted beak. Outer lip thin, six-den- 

 ticulated within. 



Length, G ; breadth, 2 6 ; length of aperture and canal, 3. 



Locality. — Lower beds at Muddy Creek. 



3. Trophon torquatus, spec. nov. Plate vi., fig. 2. 



Shell elongate, fusiform, witli a produced spire, terminating 

 in an apex of two and a half or three smooth gradated, rapidly 

 tapering whorls, the extremity of whicli is erect, ; a thin erect 

 lamella encircles the carina of the apical whorls. Whorls, 

 three or three and a half, excluding the nuclear whorls, ven- 

 tricose and shouldered ; the earliest whorl with three spiral 

 lirae on the anterior two-thirds, increasing to four on the 

 penultimate, equidistant, of which the posterior one is not so 

 stout as the rest. Last whorl ventricose, gradually attenuated 

 in front, with about 10 encircling threads. On each whorl 

 there are about 20 lamelliform costas, which produce square 

 depressions by intercrossing witb the lirate, where they are 

 slightly squamosely elevated ; on the body whorl, the costa? 

 are continued on to the beak. Aperture variced ; canal as long 

 as the aperture. 



Length, 8 ; breadth, 3 ; length of aperture aud canal, 4. 



Localities. — Turritella clays, Aldinga; and Adelaide bore. 



4. Trophon icosiphyllus, spec. nov. PI. ii., fig. 3. 



Shell elongate fusiform, with a mamillate apex of one and a 

 half whorls. "Whorls four, excluding the embryonic ones, the 

 two earlier whorls depressedly convex, costated ; the penulti- 

 mate whorl convex ornamented with five spiral lir^e and about 

 20 lamelliform costfe, whicli undulate as they pass over the 

 lirfe and are sharply bent forward at the posterior suture. 



