196 Marine Shells of the Western Coast of Florida 



rowly covering the edges. 



Animal elongate, not capable of being wholly contained in the 

 shell; tentacles folded; eyes sessile; foot long; epipodial ridges well 

 developed, giving rise to two winglike lobes on each side. Color of 

 mollusk bright lettuce-green; body surface velvety, delicately reticu- 

 lated and peppered with line lines and dots of reddish purple, show- 

 ing through the shell. Dorsal surface of the foot bears minute, pale, 

 slightly elevated papillae. Posterior dorsal part of foot and body 

 bear two lateral rows of pale brownish papillae, some large and 

 pointed, others smaller, rounded and less elevated; the intervening 

 body surface is sightly granular. 



Four tentacles; an upper or superior pair of folded rhlno- 

 phores, and a smaller, lower pair, or labial processes, less than half 

 as long, contractile. Eyes are sessile, black, small, posterior to the 

 base of the superior tentacles, at the junction of the anterior and 

 middle thirds of a thin black line. 



The four lateral parapodial lobes, two on either side, may be 

 reflected over the sides of the shell or extended in lateral position, 

 either synchronously or independently. They are deeply concave 

 with elevated and reflected borders on dorsal side, smooth and gray- 

 green within the upper concavity, granulose on exterior surface. 



The foot is long, pointed or bluntly rounded, according to the 

 mollusk's activity. Plantar surface smooth. The foot can be attenu- 

 ated and lengthened, made short and broad, or infolded laterally 

 to grasp a stem or blade of seaweed. The animal can elevate itself 

 upon the posterior extremity of the foot to an almost vertical posi- 

 tion and when in this attitude the head and anterior part of the 

 body are moved rhythmically from side to side and in half circles 

 through a fairly wide arc. The animal can also creep in a reversed 

 position upon the under side of the surface film. It descends from 

 this situation by strongly arching the body, releasing the anterior 

 portion of the foot, swinging free from posterior tip of the foot and 

 finally breakmg away from its hold on the surface film by a strong 

 contraction of the foot. 



When disturbed, the creature may arch itself strongly upward, 

 supported firmly upon the extreme anterior and posterior ends of 



