117 



III. Body wliorl convex, without costae, nodulate on the 



periphery. 



Shell ovate, one row of nodulations, moderately ventri- 



cose ; lirae flat, granular. 10. T. ovoideus. 



Gibbous ; lirae elevated, undulous. 11. T. tumulosus. 



Shell ovately fusiform, three rows of nodulations on 



body whorl. 12. T. tortirostris. 



Shell elongate-fusiform, feebly angled and nodulate at 



the periphery. 13. T. ^rotensus. 



lY. Body whorl convex, costated. 



Shell elongate-fusiform, six intervariceal costulations. 



14. T. crihrosus. 



Shell elongate-ovate, five or six stout, high, intervariceal 

 costae. 15. T. crassicostatus. 



Shell subturreted. 



Intervariceal costellje, 10 ; primary lirae on last 

 whorl, G. 16. T. oligostirus. 



Intervariceal costellae, 15 ; lir^e, 16. 



17. T. gemmulatus. 

 Intervariceal costae, 10 ; primary lirae, 4. 



18. T. Quoi/i. 

 Intervariceal costae, 6 ; lirae, 4. 



19. T. sexcostatus. 



SPECIES EXCLrnED. 



T. Prattii, T. Woods, is transferred to Banella. 



T. Tasmanica, R. M. Johnston, is transferred to 'Epidromus . 



1. Triton Abbotti, T. Woods. 



T. Ahhotti, Tenison Woods, Proc. Eoy. Soc, Tasm., for 1874, 

 t. 1, f. 8, p. 24. 



Shell elongately-ovate ; spire high, slightly distorted, ter- 

 minating in a subcylindrical obtuse apex, consisting of four and 

 a half polished, rounded, faintly lirate, and transversely 

 striated whorls. "Whorls five and a half, excluding the nuclear 

 whorls, carinated and tuberculated on the keel ; spirally lirate 

 and transversely distantly striated ,• the lirae obscurely flatly 

 granulated, unequal. 



Varices at about four-fifths of a whorl, tuberculated at the 

 carination. 



Body whorl triangulated, the posterior carination with six 

 large wedge-shaped intervariceal tubercles, the anterior angu- 

 lation with about five small intervariceal tubercles, becoming 

 smaller and finally obsolete towards the marginal varix. 



Aperture ovate; outer lip denticulated within; inner lip 

 thin, reflected over" the columella, with small transverse corru- 

 gations. Canal not quite so long as the aperture; very much 

 reverted. 



