129 



apertura lata, denticulis internis labii externi paucis, distan- 

 tibus : labio interno laminam sub-levatam efformante, margine 

 interno denticulate 



Shell oblong-ovate, fuscous, spire acuminated, volutions 6, 

 rather convex, longitudinally ribbed, with the interstices very 

 delicately decussated ; the last volution transversely striated 

 in front; aperture wide, small internal teeth of the outer 

 lip few, and distant ; inner lip forming a slightly elevated 

 lamina, its inner edge denticulated. Massachusets, Dr. Gould. 



50. Col. Miser, nob. (pi. xxxviii, f. 111.) 



Col. testa ovato-oblonga, albicante vel lutescente, spira py- 

 ramidali, anfractibus 6, convexiusculis antice castaneo macu- 

 latis, posticis quinque longitudinaliter costatis, antico cos- 

 tato, sed costis dorsabbus antice evanidis ; apertura latius- 

 cula, subrhomboidah, dentibus internis labii externi paucis, 

 parvulis. 



Shell oblong- ovate, whitish or yellowish, spire pyramidal, 

 volutions 6, rather convex, speckled with chesnut in front, 

 the 5 posterior volutions longitudinally ribbed, the anterior 

 volution ribbed, but the dorsal ribs are almost obsolete ante- 

 riorly, aperture rather broad, sub-rhomboidal, teeth within the 

 outer lip few and small. 



There is a variety with nearly obsolete ribs. Locality un- 

 known : in Mr. Bean's collection, and in my own. 



51. Col. cribraria: Buccm. cribrarium, Lam. (pi. xxxviii. 

 f. 112, 113.) 



Col. testa oblongo-pyramidali, leevigata, fusca, maculis, 

 guttulisque albidis notata ; spira acuminata, plerumque de- 

 collata ; anfractibus 7 — 8, ultimo spiraliter striato ad basin ; 

 apertura albicante, dentibus internis peritrematis superioribus 

 majusculis. 



Shell oblong, pyramidal, smooth, fuscous, speckled, and 

 spotted with whitish ; spire acuminated, generally decollated, 

 volutions 7 — 8, the last spirally striated at the base ; aper- 

 ture whitish, upper teeth of the inside of the outer bp larger 

 than the rest. 



Very common at Panama, under stones, H. Cuming. It 

 has long been well known, but we have described it by the 

 name of Col. guttata in Zool. Proc, ii. p. 118. 



52. Col. dichroa, nob. (pi. xl, f. 168, 169.) 



Col. testa oblongo-sub-pyramidali, lesvigata, alba, casta- 



