1 30 CONOMITRA. 



Conomitra dennanti, Tate (sp.). 



1889. Mitra [Eumitra) dennititi, Tate, Trans. Eoy. Soc. South Aust. 

 vol. xi. pp. 135, 137, pi. iii. fig. 3. 



Shell biconical, spire short ; protoconch (Plate V. Figs, ia-h) 

 composed of four smooth turns, minutely spirally striated anteriorly, 

 the initial portion being very small and suddenly broadening out 

 with growth ; whorls slightly staged, ventricose, strongly spirally 

 lineate and finely longitudinally striate, the striae in the lineate 

 siilcations causing a punctate appearance ; body- whorl large, em- 

 bracing, tapering anteriorly ; aperture long, narrow ; outer margin 

 straight, very thin, the deep spiral sulcations on the body-whorl 

 appearing within and forming pseudo-lirse ; columellar margin 

 covered by a thin deposit of callus throughout its length, and 

 furnished with four medially-situated plications increasing in size 

 antero-posteriorly ; anterior channel broad and truncate. 



In general shape Conomitra dennanti approaches the so-called 

 Mitra florida, Gould, said to be living in the seas of Florida and 

 the Philippine Islands. 



Dimensions. — Length 36 mm. ; breadth 16 mm. ; length of 

 aperture 23 mm. 



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



G. 4245. An example of the adult. 



Presented hy John Dennant, Esq^. 



Conomitra ligata, Tate (sp.). 



1889. Mitra [Strigatella) ligata, Tate, Trans. Eoy. Soc. Soutli Aust. vol. xi. 



pp. 135, 139, pi. V. fig. 4. 

 1893. Mitra ligata, Tate and Dennant, id. vol. xvii. pt. 1, p. 220. 



Distinguished from other species of Conomitra here described, 

 in being smooth ; the only ornament it possesses is a depressed 

 spiral band in the region of the suture, causing the latter to 

 assume a margin ate aspect, also some extremely faint spiral striae 

 on the body-whorl, which become accentuated near the anterior 

 extremity of the shell. The aperture is narrow ; outer margin 

 thin, Urate within ; columella with five plications in the adult, 

 but only four in the brephic stage, judging from specimens in the 

 Museum collection. 



