TURRITELLIDAE AND VeRMITIDAE 135 



Genus TURRITELLA Lamarck, 1799 

 Turritella subanniilatii acropora-^' Dall PI. 25, fig. 181 



Alt., 30-42; diam. of base, 7-10 mm. Shell regularly conic, im- 

 perforate; spire elongate, apex acute; 15 flattened whorls with dis- 

 tinct median keel, less prominent on lower whorls; sutures not well 

 defined; color whitish, pinkish, or pale violet, more or less patterned 

 with longitudinal brown flammules, and brown dots upon the spiral 

 ridges; nucleus pink in living specimens. Sculpture over whorls and 

 base of closely placed primary and secondary spiral ridges and fine 

 microscopic striations. Aperture rounded, entire, oblique in rela- 

 tion to vertical axis of shell; outer lip thin, protracted above; colum- 

 ella thin, concavely curved; operculum corneous, thin, amber color. 



Dredged living in three to six fathoms south of Sanibel Island 

 to Little Carlos Pass, Florida. 



Turritella exoleta-*-' (Linne) PI. 48, fig. 334 



Alt., 45 to 75 mm.; diam. at base, 13 to 15 mm. Shell regularly 

 conic, imperforate; spire elongate, apex acute; 18 to 20 concave 

 whorls, heavily ridged above and below; sinuated growth lines, 

 with occasional thin laminations; color white to yellowish with 

 flammules of chestnut-brown, curved with the growth lines; fine 

 continuous spiral lines on concave area of whorls. The last whorl 

 has a double ridge. Aperture large, rounded from the base to the 

 thin outer lip which is sinuous in the middle; lower edge straight; 

 operculum corneous, thin, amber color. 



Dredged living in five to seven fathoms. 



Family TERMETIDAE 

 Both the mollusks of this family and their shells differ strik- 

 ingly from others of their kind. The animal is vermiform and 

 elongated, and the loosely coiled shell protects the wormlike body 

 in its entire length. The mollusks are entirely sedentary, and the 

 shells are usually attached to coral or rock, growing within sponges, 

 or — as is the habit of Vermicularia jargoi — gregarious, living in 



-*^ Lat., turris, tower; sub, under, below; annulus, ring; Gr., akros, end, 



extremity; poros, passage, pore. 

 -■*- Lat., exolesco, to grow to full size. 



