14 SYSTEMATIC ARRANGEMENT 



10. COLUMBELLA. 



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

 curved. Operculum ovate, acute. 



1. C. rustica, t. 1 1. 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. Pavtensis, t. 98. f. 6. 



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



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



7. C. ? 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. — Morch. 



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 lateral ones are narrower and the den- 

 tations more spread over the edge. — Morch. 



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. 



