262 



so mucli elevated as in the latter species ; whilst the characteristic 

 cuts bordering the suture, and the clearly-defined spiral striae and 

 lineations in the hrephic stage of JV. limata, are missing in this 

 species. It forms a connecting link between Lmiatia and 

 Stigmaulax. 



Dimensions. — Length 13 mm.; breadth 12 mm.; length of 

 aperture 9 mm. 



Form, and Loc. — Eocene : Muddy Creek, Victoria. 



G. 4280. Three examples. Presented lij John Dennant, Fsq. 



G. 9408. Examples of different stages of growth ; one of which 

 has an abnormally wide umbilicus. Purchased. 



Subgenus STIGMAULAX, Morch. 

 [Cat. Yoldi, 1852, p. 133.] 



The shell of this subgenus is of the same general character as 

 Naticina, but the whorls are strongly spirally lineate, wliilst the 

 lines of growth are prominent, producing a rough species of 

 cancellation ; the umbilicus has no funiculus. 



Type. — Natica sulcata, Born. 



Natica (Stigmaulax) limata, Tate. 



1893. Natica {Naticina) limata, Tate, Trans. Eoy. Soc. South Aust. 



vol. xvii. pt. 2, p. 324, pi. x. fig. 4. 

 1895. Natica [Stigmaulax) (?) limata, Cossmann, Ann. Geol. Univ. t. x. 



p. 754. 



Shell thin, globose ; protoconch (Plate VIII. Figs. \a-h) smooth, 

 depressed, suture canaliculate, composed of two turns, merging 

 imperceptibly into the shell of the brephic stage where the suture 

 is bordered by short longitudinal cuts, which must not be con- 

 founded with lines of growth ; these cuts, as the neanic stage is 

 approached, are modified into irregular small sulci extending riglit 

 across the whorls ; the spiral lineations, which are very irregular 

 and much cut up by growth-lines in the body- whorl of the adult, 

 commence as indistinct, regular lineations in the brephic stage ; 

 aperture ovate ; outer margin oblique, thin ; inner margin not 



