MUSEUM OF COMPARATIVE ZOOLOGY. 101 



In the smaller specimen, which is a male, the rij^ht ventral arm is longer 

 than the lelt, and the tip appears to have been flattened, and the marginal 

 membranes seem to have been wider, with the edges infolded so as to form a 

 sort of furrow on the outer side ; but the suckers are mostly gone, and the tip 

 is too much injured in both specimens to be accurately described. 



Tentacular arras long, more than twice the combined length of the head and 

 body, slender, round, gradually tapering to the tip, like a whip-lash ; the distal 

 half of their length covered with very numerous, crowded, minute, pedicelled 

 suckers, which cover nearly the entire surface along the terminal jjortion, 

 leaving only a narrow naked line along the back, but farther from the tip 

 this naked space becomes gradually wider and the band of suckei-s narrower, 

 and after these crowded bands of suckers cease, scattered suckers, placed mostly 

 two by two, extend for some distance along the proximal part of the arms. 

 The suckers of the tentacular arms are so small that their form cannot be seen 

 ■with the naked eye ; they are deep cup-shaped, with a small circular aperture, 

 supported by a horny ring, which is often armed with two or three sharp 

 teeth, on one side. 



The pen is pale yellow, thin and slender anteriorly, with two sublateral 

 costse, and with narrow, delicate margins, outside the costse ; in the middle it 

 becomes still thinner and narrower, with the margin inrolled ; beyond the 

 middle, the margins become much wider, and then unite together ventrally, 

 forming a long, hollow, conical portion, extending to the acute posterior tip ; 

 this portion is not so broad as deep, and has a slight dorsal keel and a ventral 

 groove ; the cavity is filled with a soft, gelatinous substance. 



Color of body and arms, so far as it is preserved in alcohol, deep brownish 

 orange : on the upper side of the back and caudal fin the color is better pre- 

 served, and shows small ocellated circular spots of orange-brown, with an 

 inner circle of whitish, and a central spot of purplish brown. Similar spots 

 also exist on the head and arms, and also on the lower side of the body, where 

 the color is best preserved. 



A considerable amount of a bright orange oily fluid, insoluble in alcohol, 

 exuded from the viscera. Examined by means of the spectroscope, this fluid 

 absorbed part of the green, all of the blue, and most of the violet rays. The 

 stomach contained fragments of small Crustacea. 



MEASUREMENTS IN MILLIMETERS. 



Male. Male. 



Total length, to end of sessile arms 137. 232. 



Head and body combined 59. 122. 



Length of body 46. 99. 



Length of caudal fin, from origin 30. 60. 



Breadth of caudal fin 42. 75. 



Breadth of body 15. 23. 



Length of dorsal arms 24. 45. 



Length of 2d pair of arms 33. 60. 



Length of 3d pair of arms 34. 60. 



