FAMILY 10. PURPURIFERA. 243 
attempt to effect a monograph of this genus is that lately made by Duclos ; 
it, however, still remains to be completed. 
The Olive, together with the Ancillarie, were arranged by Lamarck and 
his contemporaries in the family of the Columellata after the genus Tere- 
bellum ; but in consequence of the great affinity which exists between the 
Ancillarie and the Eburne, they were removed with them by Gray to a 
place amongst the Purpurifera. 
The shell of Oliva may be described as being very highly polished, and 
of an oblong, somewhat cylindrical form, the base being slightly emargi- 
nated, whilst the spire is short, and pointed at the apex ; the whorls are 
very closely rolled over each other, and the suture running between them 
is more or less canaliculated, and said to contain a certain filament of the 
mantle ; the aperture is very narrow, extending nearly to the top of the 
shell ; the columella is sulcated, or striated, somewhat swollen, and often 
obliquely twisted; and the outer lip is simple, and sometimes rather 
thick. 
Examples. 
Pl. CCLXXIII. Fig. 1. 
Otiva porPHyRia, Lamarck, Anim. sans vert., vol. vii. p. 418. Ency- 
clopédie Méthodique, pl. 361. f. 4. a, b. 
Cylinder porphyreticus, D’Argenville. he 
Castra Turcica, Martini. 
Pl. CCLXXIII. Fig. 2. 
Oxiva maura, Lamarck, Anim. sans vert., vol. vil. p. 420. Encyclopédie 
Méthodique, pl. 366. f. 2. a, b. 
Cylinder mger, Rumphius. 
Dactylus niger, Klein. 
Olea niger, D’Argenville. 
Vidua Mauritiana, Martini. 
Pi. CCLXXIII. Fig. 3. 
Ouiva susuLata, Lamarck, Anim. sans vert., vol. vil. p. 435. Ency- 
clopédie Méthodique, pl. 368. f. 6. a, 5. 
