266 SEGUENZIA. 



The reasons for changing the name of this subgenus are given 

 on pp. 264-5. 



Type. — Euspira canalicuhta, llorris and Lycett. 



Euspira (AmpuUospira) eflfusa, Tate. 



1S93. Atnpullina [Euspira) effusa, Tate, Trans. Eoy. Soc. South Aust. 



vol. xvii. pt. 2, p. 327, pi. x. figs. 2, 2a. 

 1894. Ampiillina effusa, Tate, Journ. Eoy. Soc. N.S.W. vol. xxvii. p. 181. 



The specimens in the Museum are not in good preservation, but 

 Professor Tate, comparing A. effusa with the European Eocene 

 A. acuminata, Lamarck, and A. levesquei, D'Orbigny, states that 

 "It agrees with them in the elevated and canaliculate spire, but 

 is readily distinguished by its regular spire (not subulate), 

 effusively dilated aperture, and elegant sculpture ; from A. 

 acuminafa, it is further removed by being umhilicated, but 

 resembles A. levesquei in its simple umbilicus." The surface is 

 ornamented by closely-set spiral striae broken up by slightly 

 curved incised lines. 



Dimensions (after Tate). — Length 35 mm. ; breadth 24 mm. ; 

 height of aperture 21mm.; width of aperture 13 mm.; width of 

 umbilicus 2 mm. {vix). 



Form, and Loc. — Eocene : boring in Adelaide, South Australia. 



G. 9432. Two specimens of the neanic stage of growth. 



Furchased. 



Eamily SEGUENZIID^. 



Genus SEGUENZIA, Jeffreys. 

 [Proc. Eoy. Soc. vol. xxv. 1876, p. 200.] 



Shell small, trochiform, thinly nacreous ; ornamented by spiral 

 keels; "with an infra-sutural sinus resembling that of some 

 Pleurotomidae, a sharp and shallow sinus at the periphery, and 

 a third, more open, at the base ; the columella is more or less 

 twisted, with an interior tooth-like projection; the base is either 

 deeply umhilicated or imperforate." — Tate. Professor Tate' 

 discusses its affinities at some length. 



Type.- — Seguenzia formosa, Jeffreys. 



1 Trans. Eoy. Soc. South Aust. vol. xiii. pt. 2, 1890, p. 192. 



I 



