142 A. E. Verrill— Mollusca of the New England Coast. 
with the corners rounded and the obtuse tip a little prominent and 
directed posteriorly. 
The arms increase in size and length from the dorsal to the ventral 
pairs. ‘The dorsal arms are very slender and short, in length not 
half as long as the head ; the second and third pairs are similar in 
form, but increase regularly in size and length, the third pair not 
being equal to the length of the head ; the ventral arms are, on the 
contrary, very much larger and longer than the third pair, their 
length being nearly three times as great; the tentacular arms are 
very slender and considerably exceed the ventral arms in length when 
extended ; the club is distinctly larger than the rest of the arm, a 
little flattened and expanded in a narrow lanceolate form, and covered 
by regular, minute suckers, arranged in about four rows along the 
middle portion. The slender portion of the arms bears a row of small 
sessile suckers and tubercles along nearly its whole length; these 
suckers are usually elliptical in form where the arm is extended, but 
circular when contracted; they are rather larger than the suckers of 
the club, but are only a little elevated, and are so numerous that the 
intervals between them are often not greater than their own diameter, 
but when the arms are fully extended these intervals are increased. 
On the ventral arms the suckers are small, oblique cups, constricted at 
the aperture and attached by very slender pedicels; they are arranged 
rather distantly in two alternating rows, which occupy only a narrow 
median band on the inner face of the arms; just exterior to the 
outer suckers, and alternating with them, there is a row of small, 
rounded, slightly raised, reddish brown warts, in diameter equal to or 
somewhat exceeding the suckers. On the other arms the suckers are 
relatively more numerous, and more closely arranged in two regular 
rows; on these arms they are about the same in size as on the ventral 
ones, but are flatter, less obliquely attached, and, have the aperture less 
constricted and not so one-sided. On the inner surface of these arms 
there are two rows of brown spots, alternating with the suckers. 
Color of the body and head, in alcohol, pale, translucent bluish 
white, spotted along the middle of the dorsal surface with rather large 
chromatophores, which are not very numerous, and with fewer 
scattered ones on the sides and ventral surface. Caudal fin yellowish 
white, opaque (owing to the effect of the alcohol), with a median 
band of chromatophores along the dorsal surface and with very few 
beneath. On the dorsal side of the head, between the eyes, the chro- 
matophores are more numerous than elsewhere ; a row of similar 
chromatophores extends along the outer surface of each arm. ‘Ten- 
