OLIVA. 



The small, ancillaria-like species, mauy of which have 

 opercula, constitute the genus Olivella of Swainson. 



Between the above are various groups, mostly consisting 

 of a small number of species each, such as Olivancillaria, 

 D'Orb., 0. Braziliensis, etc. ; Lenteicula, Ad., 0. auricularia, 

 etc. ; Callianax, Ad., 0. biplieata ; Dactylidea and Micana, 

 Gray, 0. zenospira, etc., Utriculina and Anazola, Gray. 

 Some of these have opercula. 



Agaronia, Gray, includes the larger ancillaria-shaped 

 forms, with wide apertures and acuminate spires, such as 0. 

 hiatula, 0. pallida, etc. They have an operculum which is 

 rarely preserved. 



Species. 



1. porphyria (f. 1, 2), Lvnnceus, Syst. Nat. — Ventricoso- 

 cylindracea, terminis rotundis, salmonea, lineis fuscis angu- 

 latis plus minusve approximatis notata; spira breviuscula, 

 apice mucrouato ; anfractibus concavo-depressis violaceis ad 

 suturam fasciculatis, balteo postice violaceo, antice fusco lit- 

 terato ; columella dense plicata, tumida, callo antico quadri- 

 plicate, postice violaceo ; apertura fulva ; labio acuto. — No 

 other species approaches this in form or marking. 



2. incrassata (f. 7, 8, and 473), Solander ; Duclos, Oliva, 

 t. 1 7, f. 9, 10. — Crassa, late turbinata, postice obtuse angu- 

 lata, pallide lutea, maculis fuscis irregularibus numerosis 

 frequenter majoribus angulatis picta ; spira conica, balteo 

 piperito ; apertura salmonea ; columella crassa, obscure pli- 

 cata, callo antico lato ; labio crassissimo, postice angulato, 

 extus planulato. — Distinguished by the flattened outer lip, 

 ponderous growth, and angular form. The narrow variety, 

 f. 8, is scarcely recognizable as belonging to this species, 

 having scarcely any angle. 



3. Timorea (f. 4), Duclos, 01. t. 17, f. 11-13.— 0. incras- 

 satce similis, sed vix turbinata, baud tantum angulata, liueis 

 acute angulatis creberrimis picta ; columella subacute pli- 

 cata. — Why Mr. Reeve concluded this to be a variety of 0. 

 reticularis, Lam., it is impossible to say, as he had only seen 

 Miss Steer's specimens and Duclos' figures, all broadly 

 typical. The statement that the shell is not from Timor is 

 made without stated authority. 



4. sdbangulata (f. 3), PhiUppi. — 0. incrassatce similis, 

 postice valide angulata, ante angulum elongata et coarctata ; 



