28 



brown, or dark grayish ; an obscure, ill defined dark co- 

 lored line or band rises where the mantle meets the base 

 of the tentacles on both sides, and extending along, the 

 whole length of the mantle to its posterior extremity 

 converges towards the line of the opposite side ; another 

 band proceeding from under the posterior edge of the 

 mantle, not quite continuous with the above described 

 line, runs along the sides of the body to its extremity. 

 Body, cylindrical, narrow, when extended very much 

 elongated, expanding a little towards its extremity, and 

 ending in a flat and rounded termination ; its upper sur- 

 face is covered with narrow, oblong, prominent glands, 

 appearing sometimes as if carinated, and arranged hi 

 parallel rows, the flanks with elongated tuberculated 

 plates and finer granulations. Head darker than the 

 body, projecting very little beyond the mantle. Supe- 

 rior tentacles blackish, one-eighth the length of the 

 body, stout, bulbs translucent, ocular spot at the supe- 

 rior part, black. Lower tentacles immediately under 

 the upper, very short, conical. Mantle small, oval, nar- 

 row, commencing just behind the insertion of the ten- 

 tacles, less than one-third of the length of the animal ; 

 covered with granulations tending to a vermiform shape. 

 Disk of the foot whitish, without a separate locomotive 

 band, the marginal boundary between it and the body 

 marked by a furrow, projecting beyond the body poste- 

 riorly. Respiratory foramen small, with a cleft to the 

 margin of the mantle. Between the superior tentacles 

 is a tubercular ridge with furrows on each side. The 

 triangular mucus-pore is on the upper surface of the 



