220 



I. Shell with several varices. 

 C. miranda, A. Adams. Recent; Japan. 



IT. Shell with a variced lip. 

 C. lahiata, Tenison-Woods. Recent ; Tasmania, S. Australia. 

 C. suhlabiata, Tate. Eocene ; Australia. 

 C. lauta, Tate. Miocene ; Australia. 



III. Shell with a simple lip. 



1. Whorls punctate (at the least tlie posterior ones). 



C. Goncinna, Angas. Recent ; N.S. Wales. 

 C. prhiceps, Tate. Eocene ; Australia. 



2. AVhorls cancellate. 



C. belluht, A. Adams. Recent ; Japan. 



C. cancellata, Tenison-Woods. Recent ; Tasmania. 



C. striata, Watson. Recent; N.E. Australia. 



1. Crossea prineeps, s^^er. noo. 



Shell depressedly conoidal, rather solid, polished, of five 

 rounded whorls. 



Apex of one and a half smooth narrow depressed concave 

 whorls ; the next whorl is flattened in the posterior-half and orna- 

 mented with a few spiral rows of large punctations. With the 

 revolution of the spire the rapidly increasing whorls become con- 

 vex, the lines of punctations increase, and the punctures become 

 smaller and numerous ; finally at about the half -turn of the penul- 

 timate whorl the punctated ornament disappears. 



The last whorl is smooth, convex, finely transversely striated, 

 and faintly spirally lined ; whilst the anterior suture is bordered 

 by a narrow, somewhat ascending ligatural band, which continues 

 on to the penultimate for about a half -turn; a few spiral punctate 

 strife appear on the base. 



Aperture circular, outer lip simple, inner lip double. Columella 

 with a narrow triangular excavation on its inner face, extending 

 from about the middle position to the front, where it is inter- 

 rupted by an oblique tooth-like plait, which defines the outer 

 margin of a very short canal, supported by the basal funicular 

 rib. 



The narrow umbilical chink is bordered by a rounded stout, 

 elevated funicular rib, which ends at the inner basal angle of the 

 aperture, and on which the apertural canaliculation is formed. 



Dimensions. — Length, 4.25 ; width, 4-25 ; height of aperture, 

 2-5 ; width of aperture, 2-25. 



Localities. — Eocene. Adelaide-bore ! ; River Murray Clifis 

 near Morgan ! ; Muddy Creek ! 



This neat species is the fossil analogue of C. concinna, Angas, 

 but in that species the posterior whorls are strongly lirate and 



