14 SYSTEMATIC ARRANGEMENT 



10. COLUMBELLA. 



Shell obovate or fusiform; mouth linear, ovate; canal short, 

 curved. Operculum ovate, acute. 



1. C. rustica, t. 11. f. 6, 7, t. 98. f. 2, 4, 5. 



2. C. semipunctata (Pyrene s.), Adams, Gen. Moll. t. 19. f. 8. 



3. C. mendicaria, t. 98. f. 7. 



4. C. Paytensis, t. 98. f. 6. 



5. C. pardalina, t. 98. f. 3. 



6. C. ? lanceolata, t. 81 a. f. 2. 



7. C. 1 Bamet, t. 24. f. 10. 



8. C. fulgurans, Adams, Gen. Moll. t. 19. f. 7, 7 b, 7 c. 



The operculum of Columbella zonata is triangular, ovate ; nucleus 

 apical, acute, the basal end subtruncate; outer edge subdentate; 

 scar basal, oblong, submarginal, brown, white-edged. The lingual 

 membrane is linear elongate ; teeth 1 • 1 • 1, central with five 

 denticles, the three middle larger, central rather the largest, lateral 

 denticles very small ; lateral teeth with a kneed apex with a conical 

 basal tooth. 



In Columbella punctata the proboscis is elongate, black at the tip. 

 Teeth 1 ■ 1 • 1 ; the central transverse, simple ; lateral hooked, hamate, 

 with a large basal lobe nicked at the middle, and a subterminal tooth 

 like the recurved tip. Operculum ovate, acute ; edge entire, larger 

 end rounded ; nucleus apical, subacute, upper part slightly curved ; 

 scar oblong, oblique at the broader edge, leaving the upper part free ; 

 brown, upper part whitish. 



In Columbella semipunctata the teeth 1 ■ 1 • 1 ; central transverse, 



oblong, quite simple ; lateral hamate, versatile, with two curved 



apical teeth. Operculum ovate, lanceolate, brown ; nucleus apical, 



subacute ; lower edge rounded ; scar roundish, submarginal, with an 



■ interruption in the middle of the upper edge. 



Teeth of Columbella mendicaria 1 • 1 ■ 1 ; the central narrow, with 

 three large teeth in the middle, and with three small teeth between 

 them. The lateral teeth short, with long conical basal and larger 

 terminal lobe. — Moreh. 



Teeth of Columbella mercatoria 1 • 1 • 1 ; central transverse, eden- 

 tate, lateral elongate, oblong, nearly equally broad, with two or three 

 hooked teeth near the top. C. rustica, C. strombiformis and C. uni- 

 color have very similar teeth. 



Teeth of C. gibberula 1 • 1 • 1 ; the central transverse, edentate, the 

 lateral narrow, slender, with two or three subterminal teeth. C. ru- 

 ff osa has similar teeth, but the lateralones are narrower and the den- 

 tations more spread over the edge. — Moreh. 



11. Engina. 



Shell ovate ; mouth ovate, linear ; pillar concave, with a broad 

 oblique plait in front ; inner lip expanded, veined ; outer lip thick- 

 ened internally and toothed with a groove behind (externally). 

 Teeth ? Operculum ovate, acute, curved. 



