123 



denly narrowed, "then somewhat depressedly dilated, and ending: 

 in a blunt appressed point. 



Whorls five, excluding the embryonic ones, convex, rather- 

 tumid in front of and depressed behind each varix; ornamented 

 with a median row of stout granulations, anterior to which are 

 three very broad, rounded, nodately undulose encircling ridges,, 

 and two similar ones at the front, with a stout thread in each 

 interspace ; the whole surface traversed by close-set striae. 



Last whorl ventricose, with numerous lirsB alternately stout 

 and slender on the anterior portion, the primary lirae with 

 distant, elongate, depressed granules. 



Varices at four-fifths of a whorl crenulated by the lirae ;, 

 intervariceal nodulations seven. 



Aperture ovate ; outer ]ip lirate ; inner lip corrugated, 

 slightly angulated in front ; canal of moderate length,* shorter 

 than the aperture, oblique, and strongly reverted. 



Length, 42; breadth, 24; length of aperture, 15; of canal, 10. 



Localities. — Lower beds, Muddy Creek; blue clays, Schnapper 

 Point. 



T. tumiilosus has a general resemblance to T. cypJius, but 

 differs in shape of whorls and in the spiral ornament. Among 

 living species it has some affinity with T. suhdistortus, from 

 which it differs by its shorter spire, long canal, and the gross 

 spiral sculpture. 



12. Triton tortirostris, spec. nov. Plate v., fig. 7- 



T. minimum, Tenison Woods, Proc. Eoy. Soc, Tasm., for 

 1870, p. 107 (non Hutton). 



Shell ovate, with a high conical distorted spire ; apex 

 globose of four rounded whorls, ending in a very small de- 

 pressed tip. The anterior whorl is obtusely angled above 

 and medially, and is transversely striated. 



Whorls six, excluding the apical ones, rounded, obscurely 

 angulated and tuberculated ; last whorl rather tumid, abruptly 

 contracted at the base into a broad, short, dextrally bent and 

 reverted beak. The last whorl in young specimens is narrowly 

 truncated on the periphery. 



Surface ornamented with unequal, depressed, spiral lirae, 

 broken up into elongate granules and transverse striae ; there 

 are from six to eight lirae on the posterior slope of the spire- 

 whorls. Varices rather broad, convex axially, without tuber- 

 cles, the lirae which pass over them are granulated at the 

 intercrossing by strong transverse threads ; situated about 

 four-fifths of a whorl. 



The periphery between the varices on the last whorl with a 



*The canal of the figured specimen is incomplete. 



