124 



TOW of five trifid nodulations ; the anterior row, whicli is in an 

 aligament with the posterior angulation of the aperture, is 

 weaker and separated by a wider interspace than that which 

 intervenes between the two equal and posterior ones ; base 

 with two inequidistant strong subnodulous lirae. 



Aperture oval, oblique ; outer lip with a sharp erect margin, 

 ■denticulate within ; inner lip broadly reflected on the colum- 

 ella, smooth, with an oblique anterior fold and bearing three 

 denticles at the end. 



Length, 49 ; breadth, 27"5 ; length of aperture, 17 ; of canal, 

 11. 



Localities. — Blue clays at Schnapper Point ; in the lower 

 beds at Muddy Creek ; and gastropod-bed of the Eiver Murray- 

 cliffs, near Morgan ; Table Cape \R. 31. Johnston /) 



This species though partaking somewhat of the general form 

 of T. Woodsii is readily separable by its rounded apex, trifid 

 nodulations, in which latter character it approaches T. inter- 

 costalis, but is otherwise very different. 



T. minimum, Tenison Woods, was established on a specimen 

 of 11 mills, long. This I have had under observation, as also 

 another example of IS mills, in length. Both agree perfectly 

 with the young of corresponding size of T. tortirostris. As 

 the specific name had already been employed by Ilutton in 

 1873 for a dissimilar Nev\' Zealand fossil, I have imposed a new 

 designation. 



I cannot concur with the opinion of Prof. Hutton, Proc. 

 Lin, Soc, N-S-W., p. 481, 1886, that this species, Murray- 

 examples of which under the M.S. name of T. pseudospengleri 

 had been examined by him, is the same as T. minimus, Hutton, 

 of which I have before me authentic specimens. 



13. Triton protensus, spec. nov. Plate v., fig. 10. 



Shell turriculate-f usif orm ; apex obtuse, of about two narrow 

 smooth whorls, of which the posterior one at first overhangs 

 the other, thence rapidly attenuated to a small incurved de- 

 pressed point. Whorls five, excluding embryonic ones ; the 

 earlier ones flatly convex ; the last one and a half whorls 

 feebly augulated medially, and there feebly nodulated. 



The ornament consists of flat narrow spiral threads, with 

 "wider interspaces, cancellated by moderate closed slender 

 threads, producing on the earlier whorls minute granulations at 

 the intersection. Varices at about four-fifths of the whorl, 

 broad, elevated, ornamented as rest of the surface ; the inter- 

 Tariceal nodulations five in number. Outer lip feebly denticu- 

 lated within ; base of the columella with a few corrugations ; 

 canal as long as aperture, reverted. 



Length, 29 ; breadth, 11 ; length of aperture and canal, 16. 



