742 STUDIES ON AUSTRALIAN MOLLUSCA, xii., 



But Souverbie's species, Z. regulus, seems to me to be more 

 slender and more closely ribbed, and worthy of distinction. From 

 New Caledonia, Souverbie described Colnmbella pumila, but 

 finding that Dunker had appropriated that name for a Japanese 

 species, he altered it to C. regulus* 



Brazier t has correctly reported C regulus from several locali- 

 ties in tropical Queensland; Eclipse, Fitzroy, Palm, Barnard, and 

 Home Islands. 



At Port Moresby, Papua, I found C. regulus to be common; 

 this is the northernmost record for the species. 



Tryon, having wrongly united C. atrata to C. pumila, pro- 

 ceeded to link together G. lentiginosa, C. smithi, and C. darwini.l 



It has already been explained that C. lentiginosa is a Central 

 American shell, distinct from the Australian species. Compared 

 with C. smithi Angas, C darwiiii is twice as long, more solid, of 

 another colour and sculpture, and of a more northern habitat. 

 In C. darivini, the ribs continue on the back of the last whorl, 

 but in C . regulus, C. smithi, and G. avicennia there is a smooth 

 space behind the aperture. 



So that two distinct Australian shells, namely, Zafra regulus 

 (my fig.77) and Z. a vicenma (figs. 6 8, 69), have been mistaken for 

 the Hong Kong G. atrata and the American C, lentiginosa, while 

 Z. darwini (fig.74), Z. smithi (fig. 75), and Z. almiranta (tig.92) 

 have also been involved in this confusion. That others may sort 

 out these species more easily than I have done, all are now here 

 figured. 



Zapra avicennia, sp.nov. 

 (Plate Ixxxiii., figs. 68, 69.) 

 Shell solid, glossy, ovate-fusiform. Colour uniform cinnamon- 

 brown. Whorls seven, gradate, last inflated at the periphery 

 and contracted at the base. Sculpture : first two smooth, re- 

 mainder radially ribbed, ribs prominent, as broad as their inter- 



* Souverbie, Journ. de Conch., xi., 1863, p.281, PI. xii., fig. 4.; Id., op. 

 cit., xii., 1864, p.41. 



t Brazier, Jouru. of Conch., ii., 1879, p. 189. 

 + Tryon, Man. Conch., v., 1883, p. 171. 



