OLIVA. 15 



spira breviter conica, anfractibus callosis, sutura dense 

 punctata ; balteo flauimulato ; columella fere omnino dense 

 plicata, callo antico angusto, plicis quinque duplicatis ; 

 apertura intus alba; labio intus fusco niarginato. — Some- 

 what intermediate between ncostina and some of the very 

 narrow forms of 0. MauriUana, but differing from both in 

 form and the numerous folds of the columella. 



70. pacifica (f. 151), Marrat. — Cylindrica, oblonga, fulvo- 

 lutescens, lineis pallide fuscis undatis notata ; spira breviter 

 conica, anfractibus depressis canaliculatis ; balteo tumido, 

 undatim strigato ; columella callosa, plicis distantibus tu- 

 midis, fere omnino continuis, plicis calli antici subalterna- 

 tis ; apertura intus subcasrulea, labio intus extusque abraso, 

 leviter arcuato. — I am indebted to Mr. Cutter, of Great 

 Russell Street, for this and 0. arctata, Marr., two interest- 

 ing forms, of which Mr. C. has other specimens. I cannot 

 compare the present shell with any other species (Marr.). 

 The editor sees little reason for separating this species from 

 0. arctata, still less for placing it in a widely separated 

 group. 



71. neostina (f. 153, 154), Duclos. — 0. Labradorensi 

 forma simili, lineis undatis longitudinalibus strigata. — 

 Marked with continuous waved longitudinal lines; other- 

 wise like 0. Lahradorensis and 0. leucostoma. — Ed. 



72. elegans (f. 158, 159, 160), La/mk. — Ovato-inflata, 

 cinerea, lineis angulatis et maculis nigrescentibus varie 

 picta ; spira brevi, anfractibus depressis tumidis ; balteo 

 lineato ; columella obscure plicata, plicis calli antici 4 aut 5 

 distinctis, subaurantiis ; apertura intus albido-subcserulea, 

 labio incrassato, extus abraso, maculato. — The type shells of 

 this species are smaller than any of those belonging to the 

 allied forms, viz. 0. tigrina and 0. maiira ; but the very 

 closest affinity existing between the narrowly cylindrical 

 form of 0. elegans and small forms of 0. mawra is very ap- 

 parent. 



73. flava (f. 156, 157), Marrat. — 0. infrenatce similis, sed 

 rosea, rubro maculata ; spira longiuscula, callo antico colu- 

 mellae vivide flavido. — Somewhat Hke 0. infrenata, but less 

 inflated, spire longer, and the plaits of the columella are very 

 different, being bright yellow (Marr.). Should not this shell 



