145 



difficult to see what Conrad meant. "Whatever views we may- 

 hold as to the propriety or otherwise of making genera in that 

 fashion, Afer has as much right to stand as many other genera 

 established in the same way. 



L. murrayanus differs from both Afer afer and A. porphyrosUma 

 in the character and development of the protoconch, in which 

 respect it more nearly resembles the Australian species here classed 

 as Latirus. With this exception the separation of the species from 

 Conrad's genus is purely arbitrary, and conchologically it is inter- 

 mediate between the two genera mentioned. 



The form found at Table Cape, Tasmania, and described by 

 Mr. G. B. Pritchard in the memoir above cited, is more costate, 

 and the whorls are not so distinctly angulate as in typical examples 

 of the species from the River Murray. The species appears to be 

 very variable. 



Dimensions. — Length 27 mm.; breadth 14 mm.; length of 

 aperture 9 mm. ; length of canal 85 mm. 



Form, and Loc. — Eocene : River Murray cliffs, near Morgan, 

 South Australia. 



G. 9137. An example of the neanic stage of growth. 



Presented by William Evans, Esq. 



G. 9460. Three specimens of the adult. Purchased. 



Latirus inter lineatus, Tate (sp.). 



1888. Feristernia iiifcrUucata, Tate, Trans. Roy. Soc. South Aust. vol. x. 



p. 159, pi. vi. fig. 1. 

 1893. Peristernia interUncata, Tate and Dennant, id. vol. xvii. pt. 1, p. 219. 



Shell fusiform, spire elevated, staged ; protoconch similar to 

 that of L. murrayanus ; whorls spirally ridged. Described by 

 Professor Tate as foUows : — " Ridges angular, acute, three or four 

 of which on the median portion of the spire-whorls forming keels ; 

 the broad concave furrows with a thread, crossed by straight 

 distant striaj. On the body-whorl the ridges are more serrately 

 cut by the transverse striae than those are on the spire." Aperture 

 ovate, broadened outwardly ; outer margin Urate within, with a 

 large denticle at the entrance of the canal ; inner margin covered 

 with a thin deposit of callus, sometimes partially detached, carrying 



