OLIV/E. PI. 3. 



The Wide-mouthed Olives. 



Family Volutidye. Genus Oliva. Nob. 



Sub-Genus Hiatula. Nob. 



Suture channelled. Pillar above smooth, not thickened, beneath 

 tumid, and marked with a few oblique plaits : base of the 

 aperture very wide. 



Specific Characters. 



Hiatula Lamarci. Fulvous broivn : pillar white, with about /our 

 lengthened plaits, a7id intermediate shortened ones bettveen 

 them, inner margin o/ the lip broivn. Fig'. 1. 



H. pallida. Aperttirc and base of the pillar livid brown : plaits 

 4 — 5, simple, equal ; inner margin of the lip pale. Fig. 2. 



H. maculosa. Aperture orange, marked above with a black spot : 

 base of the pillar white, the plaits small, croivded, and of un- 

 equal length. Fig. 3. 



Mus. Nost. 



As the connection of the Olives with the Mitres has been 

 illustrated in a former number, we now characterize the 

 sub-genus by which the former are united to the Ancillariae, 

 The thickened and oblique plaits on the pillar, its smooth- 

 ness on the upper part, and the great width of the aperture, 

 are all characters which render this affinity unquestionable, 

 and detach the group from the more common and typical 

 Olives before alluded to. 



Since we published the figure of Oliva stinata, (Oliva, 

 PI. 1. f. 2.) we have procured the ivne Ancillaria canalifera 

 of Lamark, and find it as we suspected, a very different 

 shell. As Hiatulalends ioi\\e A nci liar iae, so does the sub- 

 genus Olivella, (comprising the small operculated Olives) 

 conduct us to the Mitres, by means of Olivella volutella., 

 already figured in this work. We believe the third aberrant 

 form is represented by our Oliva striata, but we shall not 

 proceed to characterize it as a sub-genus, until a better ac- 

 quaintance with the group is obtained ; its analogy to Cono- 

 helix, by its external sculpture, seems to us a strong ground 

 of distinction. 



We procured all these wide- mouthed Olives from the 

 Messrs. Stuchbury, to whom we are often indebted for the 

 loan of interesting specimens. 



Oliva. PI. 3. 



78. 



