PART II. OLIVIN^I. 321 



times papillary; aperture without either striae or 

 groove. 

 monodonta. Zool. 111. ii. 128. f. 1. terebellum. Ib. f. 2. 



Sw. Small ; cylindrical or conic ; spire ge- 

 nerally short and thick ; plaits on the pillar nu- 

 merous ; exterior often decussated. 



C. conulus. En. Me"th. 382. f. 2. 



MITBELLA Sw.* Rather small; olive-shaped; ^ 85 

 unequally fusiform ; always smooth and 

 polished, and sometimes covered with an 

 epidermis ; base obtuse and effuse ; spire 

 nearly or quite equal to the aperture ; 

 plaits of the pillar few, oblique, and ex- 

 tending beyond the aperture, which is 

 smooth internally. (M. bicolor,/^. 85.) 



ocellata. Zl. 111. v. pi. 54. f. 2. olivaefonnis. Zool. 111. i. pi. 48. 

 fissurata. En. M. 371. f. 1. ii . 54. f. 3. 



casta. Zool. 111. i. pi. 48. fusca. Ib. ii. pi. 54. f. 1. 



bicolor. Ib.ii. 19. f.2. Ofy.85.) dactylus. En. M. 372. f. 5. 

 olivaria. En. M. 371. f. 2. 



SUB-FAM. 3. OLIVIN^. Olivet. 



Shell smooth, highly polished ; spire very short ; the 

 suture channeled; inner lip much thickened; plaits 

 numerous, crowded, extending, in the typical genus, 

 the whole length of the aperture, (fig. 86, 87.) 



LAMPRODOMA Sw. Mitriform ; spire pro- 

 duced, conic; resembling Mitrella in shape, 

 but the suture is channelled ; the aperture 

 effuse at the base, contracted above ; lower 

 half of the pillar with 6-7 plaits, 

 volutella. Zool. 111. ii. series, pi. 40. f.l. (fig.S6.) 



OLIVA Lam. Cylindrical ; spire very short, 



pointed; pillar with numerous slender plaits ; aperture 

 narrow; the base not effuse, (fig.&l. c.) 

 O. maura. Sow. Man. f. 457. 



T 



