187 



Lotorium radiale, Tate (sp.). 



1888. Triton radia/is, Tate, Traas. Roy. Soc. South Aust. vol. x. p. 118, 

 pi. V. fig. 8. 



Protoconch (Plate VI. Figs. 6a-h) consisting of two and a half 

 turns, the posterior portion is smooth and commences with 

 a somewhat inflated, elevated, obtuse point, situated laterally, 

 and in some instances overlapping the anterior portion. The 

 latter is irregularly lineated, the threads corresponding to the 

 principal features subsequently developed in the shell in the 

 brephic stage. One specimen in the Museum collection, in which 

 the protoconch is well preserved, shows the central lineation 

 broken up into small granuhxtions, homologous with the spinose 

 tubercles afterwards so distinctly pronounced in the ephebic stage. 



The shell proper has five whorls carinated medially, from which 

 arise distant, compressed, tooth-like tubercles, the body-whorl 

 carrying a similar but smaller row of tubercles anteriorly. The 

 whorls are spirally and closely lineated. Prominent varices occur 

 at intervals, and it is noteworthy that just prior to putting on 

 a new varix the spinose tubercles become smaller than others 

 up to the preceding varix. The aperture is almost circular, outer 

 border lirate within, having a denticle where the deep, oblique, 

 anterior canal commences ; inner border thin, lirate, dentate in 

 front, and having a prominent callous plait posteriorly; columella 

 umbilicate, excavated, and twisted. 



Dimensions. — Length 39 mm. ; breadth 25 mm. ; length of 

 aperture r2'5 mm. ; length of canal 8"5 mm. 



Form, and Log. — Eocene: Eiver Murray cliffs. South Australia. 



G. 9123. Example of the adult. 



Presented lij JViUiam Evans, Esq. 

 6. 9400. Two specimens. Furcluised. 



Lotorium cyphus, Tate (sp.). 



1888. Triton cyphus, Tate, Trans. Roy. Soc. South Aust. vol. x. p. 119, 



pi. V. fig. II. 

 1893. Triton cijphus, Tate and Dennaut, id. vol. xvii. pt. 1, p. 218. 



This species is allied to L. radiale in many respects ; but its 

 protoconch, although lateral, is highly distinctive. It is composed 



