OP CONCHOLOGT. 241 



third pair of filaments, oh inches ; fourth or ventral pair of arms 

 the same dimensions as the third. 



Web of medium breadth. Mouth very small, not entirely 

 concealing the beak. Cupules sessile, large, with cartilaginous 

 ring, not crowded, in two regular rows. The number of cupules 

 nearest the mouth in a single line are unequal on the different 

 arms. On the dorsal pair, 5 cups in a single line ; on the right 

 arm of the second pair, 8 cups ; left arm, 4 cups ; on the third 

 pair of arms, 7 cups in a single line ; on the ventral pair, 3 

 cupules. 



On the filamentous portion of the arms the cupules are in a 

 single row at regular intervals apart, distinct quite to the tips of 

 the arms. 



Color reddish ; around the mouth and the inner surface of the 

 arms white, approaching a cream color. It changes the color of 

 its spots with great rapidity. 



Found along the coast of Santa Cruz Island. Very active ; 

 caught with difficulty. 



The above description is from the largest specimen of the 

 species that I have seen. This animal is remarkable for the 

 long and thread-like terminations to the arms ; in no other de- 

 scribed species have I met with this peculiar tentacular forma- 

 tion. 



