jecting far beyond the head; head black; body marked with blotches 

 of grayish black. Syphon, long, encircled with black blotches. In 

 crawling the syphon extends anteriorly. 



COLUMBELLA AVARA Say 



PI. V. Fig. 31. Length 15 mm. 



The soft parts resemble C. lunata in color and markings. Fig. 31 

 (A), and (B), head. (C.) operculum. 



NASSA OBSOLETA Say 



Pi. V. Fig. 32. Length 18 mm. 



Body nearly white, mottled with soot-colored spots. Foot broad 

 in front, diverging at each corner in sharply defined processes, recurved, 

 distinctly indented in median line. Syphon long, recurved. Tenta- 

 cles short, wide apart, eyes on prominent thickening at base of tenta- 

 cles. The proboscis can be greatly extended and in figure 32 (A), the 

 proboscis is shown widely extended, recurved and feeding on the sur- 

 face of the shell. 



NASSA TRIVITTATA Say 



PI. V. Fig. 33. Length 18 mm. 



An extremely active creature in confinement leaping by a series 

 of rapid somersaults, jumping at least four inches in a snapping way 

 using the shell as a fulcrum. The foot becomes very long and narrow 

 in jumping; the front of the foot is expanded on each side into long, 

 narrow recurved points. The tentacles are long and sharp and at 

 times stretched out in a straight line transverse to the longitudinal 

 axis of the body, as in figure 33 (A). The two caudal appendages are 

 long and wide apart. 



BUCCINUM UNDATUM Lin 



PI. V. Fig. 34. Length 75 mm. 



Foot broad, its anterior portion thrown into a number of folds in 

 crawhng. Body and syphon marked by irregular blotches of black; 



17 



