342 REPORT OF COMMISSIONER OF FISIL AND FISHERIES. [636] 
outer surface, which expands into a thin membrane toward the end. 
Tentacular arms long and slender, in extension longer than the body, 
the portion that bears suckers forming about one-third the whole 
length; in the female the larger suckers on the middle of this portion 
are not so large as the largest on the other arms, and are arranged in 
about four rows; those near the tips of the arms are very small and 
crowded. In the male the principal suckers of the tentacular arms are 
very much larger than in the female, and considerably exceed those of 
the other arms; they form two alternating rows along the middle of the 
arm, and external to them there is a row of smaller suckers on each side, 
alternating with them; the suckers toward the tips are very numerous, 
small, and crowded ; outside of the suckers, on each side, there is a mar- 
ginal membrane with a scolloped edge; another membranous fold runs 
along the outer surface and expands into a broad membrane near the 
end; the arms of the ventral pair are intermediate in length between 
those of the second and third pairs. Ground-color of body, head, arms, 
and fins pale, translucent, yellowish white; entire ventral surface pale, 
with small, distant, brownish circular spots, which are nearly obsolete on 
the siphon and arms; the upper surface is covered with pale brown, 
unequal, circular spots which are not crowded, having spaces of whitish 
between them; the spots are more sparse on the head and arms, but 
somewhat clustered above the eyes. The general appearance of the 
animal when fresh is unusually pale and gelatinous. The “pen” is. 
broad, quill-shaped, translucent, and amber-colored. A medium-sized 
male specimen preserved in alcohol measures 145™™ froin the base of the 
dorsal arms to the posterior end of the body; length of body, 120™™; 
length of caudal fin, 70™™; breadth of fin, 75™™; length of first pair of 
arms, 42™™; of second pair, 50™™; of third, 60"; of tentacalar arms, 
150™™; of ventral pair, 53™™. 
Long Island Sound. 
The Spirula Peronii Lamarck, (Spirula fragilis in Binney’s Gould, p. 
516, fig. 755), is occasionally cast up, on the outer beaches of Nantucket, 
but it probably does not occur alive in our waters. 
GASTROPODA. 
PECTINIBRANCHIATA. 
BELA HARPULARIA Adams. Plate XXI, fig. 108. (p. 508.) 
H. and A. Adams, Genera of Recent Mollusca, vol. i, p. 92, 1858; Gould’s Inverte- 
brata of Mass., ed. ii, p. 352, fig. 191. Fusus harpularius Couthouy, Boston 
Journal Natural History, vol. ii, p. 106, Pl. 1, fig. 10, 1838; Gould’s Inverte- 
brata of Mass., ed. i, p. 291, fig. 191, 1441. Mangelia harpularia Stimpson, Shells 
of New England, page 48, 1451. 
Massachusetts Bay to Labrador and Greenland. Off Gay Head, 10 
to 19 fathoms; in the Bay of Fundy frequent in from 1 to 80 fathoms. 
Fossil in the Post-Phocene ‘“Leda-clays” of Labrador (Packard); and 
Canada (Dawson). 
