L I V A . 



Species 5. (Fig. n, c, and c, .Mus. Cole ; Fig. b, 

 Mus. Stecre, and Fig. (/, JIiis. Cuming.) 



<)i,i\A Olvjipi.\dina. Oliv. testa ohlongo-cyUndracea, 

 rrassir, infra nuturas mhcontracld, spird exsertu, an- 

 frnctii ultimo ad extremilaiem posticam apertune cul- 

 lo!in-proditcto,2>Ucis columdlaribt(s plus minus evaiddis; 

 (dhd, purpurascente-fusco suhobscitre dilute reticnlatd, 

 intemi' fiisco srepe perampUter maculatd, colmnelld et 

 aperturafuuce albis. 



'J'liE Olympi.\n Olive. Shell oblong-cylindrical, thick, 

 .slightly contracted beneath the sutures, spire exerted, 

 last whorl callously produced at the hind extremity 

 nl' the aperture, columellar plaits more or less faint ; 

 w hitc, somewhat obscurely dilutely reticulated with 

 purplish-brown, often very largely blotched with dark 

 brown, columella and interior of the aperture white. 



DucLos, Mon. Oliv. pi. 13. f. 10 to 12. 



Hah. Mauritius. 



A magnificent series of about two hundred ispecimens, 



all of this species, collected at the Island of Mauritius by 

 ]\Iiss Cole, has enabled me to trace the connection of its 

 Varieties with great accuracy. As represented at Fig. 5 b 

 and Fig. 5 e, the slull is faintly mottled throughout with 

 light milky-purplish uei-work, intereupted with two 

 broken bands of scattered brown blotches. In the variety 

 Fig. a the brown increases in quantity, the faint mottling is 

 broken up, and, except on the under surface of the shell, is 

 almost obliterated. In the shell represented at Fig. 5 d 

 the brown is richer, more largely blotched, and the inter- 

 stices between the blotches present only very faint indica- 

 tions of the mottled net-work. The species approaches 

 very nearly in this state to the dark variety of 0. tnmulina. 

 Fig. 5 c, which in being introduced in this plate was thought 

 to belong to it. 0. Ohjnipiadhia is always to be distin- 

 guished in addition to the above-named characters by the 

 piu-e white enamel of the interior and columella, which 

 latter is always more callous. The ground is always pure 

 white, and even the dark brown painting is not unfre- 

 qucntly over-laid by a very thin milky coating of the same. 



August, 1850. 



