O L I V A 



Species 35. (Fig. a, b, Mus. Steere.) 



()li\.\ ui-VTiLA. Oliv. testa suhfusiformi-ovatd, veiitri- 

 costi, npirii mtliacHiniiiatd, columella elevatd, pUcis dis- 

 t'lKclh, pecidianler calloso-conlotiis, apniiird ikiIiiIi!, 

 siipenie emargbiald ; spadiceo-i/risni. p/ii/r//s .■<//-ii//si//ii- 

 nn-iileo-fiiscis npicem remis sidinhciin' imtnlii, :niiii 

 laid fidrd ad basin cinyulatd, cuhiuirUd lindn-pnrjiii- 

 rasrriilc, apciiurai fance Imdo-fitscd. 



TuE GAPING Olive. Shell somewhat I'usilbrmly ovate, veu- 

 tricose, spire somewhat acuminated, columella raised, 

 plaits distinct, peculiarly callously twisted, apertiu'e 

 wide Ojjen, emarginated at the upper part ; fawu- 

 grcy, somewhat obscurely marked towards the apex 

 with blue-brown dots and streaks, and encircleil 

 round the base with a broad fulvous zone, coknnella 

 livid-purple, interior of the aperture livid-brown. 



Volida Idutida, Gmelin, Syst. Nat. p. 34 13. 

 OUva Jiiatula, var. b, Lamarck. 

 V Aijarou, Adanson. 

 Aiicilln maciihda, Schumacher. 

 lliidida Lamurckii, Swainson. 



Hub. Senegal and Mouth of tlic (lambia, West .\frica. 



This and the following species were conlbuntlcd together 

 by M. Duclos, but they are quite distinct and inhabit very 

 remote localilies. The true O. h'tahdu (pi. 3. fig. 1.5, 

 of his monograph) chietly characterized ijy tlie raised con- 

 stricted growth of the columella aiul by its livid-purple 

 colouring, is from the west coast of Africa, collected by 

 Adanson at Senegal, and by later travellers at the mouth 

 of the Gambia. O. testacea (pi. 4. fig. I'J, 30, of Duclos' 

 monograph), concerning which Lamarck especially notices 

 the dark brown colouring of the spire and base of the last 

 whorl, was collected by Humboldt and Boupland on the 

 shores of Mexico, and more recently by Mr. Cuming in 

 the same locality at "Real Llejos. 



Species 3(5. (Mus. Cuming.) 



Oliv.\ test.vcea. Ollv. tesldfusifonid-oeatd, ve/drlcosd, 

 spird acuminatd, pUcis colitmellaribits calloso-coidortis, 

 apertnrd palidd, superne emarginatd ; ciiiereo-grised, 

 Uiieis Jlexuosis f/iscis ceerideo-umbratis plus minus ob- 

 scure picld, apicem versus et ad basin fumeo-fused, 

 columella albd, apertiira fauce viola ceo-Jmcd. 



The testaceous Olive. Shell fusiformlv ovate, vcutri- 



cose, spire acuminate, columcUar plaits callously 

 twisted, aperture wide open, emarginated at tiie 

 upper part ; ash-grey, more or less obscm'cly painted 

 with blue-shaded brown flexuous lines, smoky-brown 

 at the base and towards the apex, columella white, 

 interior of the aperture violet-brown. 

 Lajiarck, Anim. sans vert. (Deshayes" edit.) vol. \. p. (i27. 



Oliva hialula, pars, Duclos. 

 Ilab. Real Llejos, Mexico (in sandy mud at a dejitli cif 

 about six fathoms) ; Cuming. 

 Of a more acumiuated form than the preceding species, 

 from which it is further distinguished by its smoky or 

 purple-brown colom-iug, and white columella. It may 1k^ 

 observed that the localities of the two species are verv rc- 

 uiole from each other. 



Species 37. (Mus. Steere.) 

 (Jliva Steei!I.e. Oliv. lesld oblomjo-ovatd, vcidrieosd, spird 

 brevi, aculd, columelld medio depressd, superne callosd, 

 plicis cttlloso-coidorfis ; i/riseo-fuxcd, obscure luaeulald, 

 spird cl :n„d bas.di fuuieo-fusris, nderdun, e,ernl,-s- 

 r,;dr-l„rl,v, i ,., uiarelul ,! . adr.urlhl vhunird, apertur<e 

 faucri.lr„srpnrpered. 

 Steeue's Olive. Shell obloug-ovate, ventricose, spire 

 short, sharp, columella depressed in the middle, cal- 

 lous at the upper part, plaits callously twisted ; grey- 

 ish-brown, obscurely spotted, spire and basal zone 

 smoky-brown, sometimes bluish cream-coloiu', mi- 

 spotted, columella ivory-white, interior of the aper- 

 ture deep purple. 

 OUva hitttula, pars, Duclos. 

 Hub. ]\[outh of the Gambia, West Africa. 



The 0. Steeria is chiefly distinguished from 0. kialula 

 of the same locality, by its depressed white columella, 

 whilst the general colouring of the shell is more like that 

 of the Mexican 0. testacea. It difl'ers, liowever, from tile 

 last-named species both in the depression of the columella, 

 which gives it a boat-shaped form, and in having a shorter 

 spire. The coloured state of O. Steerlce is well represented 

 by Duclos, under 0. Jdatula, Mon. Oliv. pi. 3. f. 14. The 

 specimen figured in the accompanying plate, represents a 

 v,iii( t\ in wliich tiie entire surface of the shell is overiaid 

 witii a luilk-uhitc coating, and the interior richly purple- 



Septcuiber, 1850. 



