484 MOLLUSCA. 
mediocres: brachii sesstles curtt, graciles, infimis longioribus, supernis 
brevioribus : brachii tentaculares brevissimt: color ex sanguineo viola- 
Cescens. 
Body cylindrical, somewhat bulging at the middle and tapering 
with a curved outline, rapidly. Fin rhomboidal, broader than long, 
the angles slightly rounded, somewhat more than one-fourth as long 
as the body. Head short, closely attached to the body, subglobose. 
Eyes of moderate size and prominence ; sessile arms short and slender, 
the lower pair longest, and the upper shortest. Tentacular arms, very 
short, nearly destitute of a pedicle. Colour beautifully shaded with 
sanguineous and violaceous, the effect being produced by minute dot- 
tings. 
Entire lenyth, six inches; length of body, three inches and three- 
quarters; length of head, five-eighths of an inch; greatest diameter of 
body, five-eighths of an inch; breadth of fin, two inches and a quarter; 
length, one inch and three-eighths. 
Obtained at sea, about 120 miles west of 'Tutuilla, Samoa Islands. 
Described from a figure from life, by Mr. Agate. If the proportions 
are given correctly, as there is no reason to doubt, the extraordinary 
brevity of the tentacular arms, scarcely longer than the shortest sessile 
arms, is of itself enough to characterize the species. The figure is 
also supposed to represent the true dimensions. 
Figure 596, dorsal view of the animal. 

