TEBENNOPHORUS. 21 



bands, one on the centre of the back, and one on each 

 flank, extending from the head to the posterior extremity, 

 anastomosing more or less "with each other, and having 

 smaller spots of the same color between them ; inferior 

 margin white, or yellowish ; foot whitish. Mouth sur- 

 rounded with a circular row of papillae. Body elongated, 

 sub-cylindrical, flattened towards its posterior extremity, 

 which is obtuse ; superior tentacles one-fourth of an inch 

 long, brownish or blackish, stout, terminating in a bulb ; 

 ocular points on the superior part of the bulb ; inferior 

 tentacles immediately below the upper, white, very short, 

 nearly conical. Mantle fleshy, covering the whole body, 

 its anterior edge tinged with brownish, and falling in a 

 slight curve between the two superior tentacles, reaching 

 on the sides to the margin of the foot ; posterior extrem- 

 ity rounded; cuticle covered with irregular vermiform 

 glands, anastomosing with each other, and having a gen- 

 eral tendency to a longitudinal direction, with shallow 

 furrows between, lubricated with a watery mucus, and 

 susceptible of contractions which produce a slow, undu- 

 latory motion, like the flowing of water, over the whole 

 surface. Foot whitish, extending a little beyond the 

 mantle posteriorly, showing a whitish flattened border. 

 Orifice of the organs of generation on the right side, at 

 a little distance behind and below the superior tentacle. 

 Respiratory orifice large, on the right side, one-fourth of 

 an inch behind the origin of the superior tentacle ; anal 

 orifice in close contact, a little above and in front of it ; 

 above the respiratory orifice, on the back, is a deep 



