602 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
continuous groove or furrow. The ridges as seen from the inside of 
the sac are narrow, and generally separated by about twice the distance 
of the internal longitudinal vessels. They become wider as the larger 
transverse vessels are approached, so that the stigmata on their sides 
have an oblique position (fig. 129). This peculiarity led Verrill 
(1872b) to form a distinct genus (Ascidiopsis) for this species; the 
character is, however, but an exaggeration of the plication which occurs 
in most species of Phallusia. The transverse vessels are narrow and 
of four orders arranged according to the scheme (1, 4, 3, 4, 2, 4, 3, 4, 1, 
etc.) The internal longitudinal vessels bear a rather long, nearly 
straight papilla at each intersection with a transverse vessel and a 
similar but smaller one midway between each intersection. An indi- 
vidual 40 mm. long had between 60 and 65 internal longitudinal 
vessels on one side of the sac, and about 80 transverse vessels. 
Stomach and intestine are very large, often covering almost the 
whole left side of the body. The stomach and proximal part of the 
intestine are, moreover, more bent than in the last species; the stomach 
has internal longitudinal ridges as in that form though smooth inter- 
nally. The anus margin is irregularly two-lipped. 
The ovary, at least in the specimens studied, was more ramified 
than in P. ohliqua and one or more branches of it may spread over the 
side of the stomach or proximal part of the intestine which lies against 
the mantle. The testis is composed of small pyriform or lobed glands 
borne on branching ducts, and also extends over much of the same 
side of the stomach. The oviduct is large and accompanies the rec- 
tum. 
Geographical distribution about the same as that of P. ohliqua 
except that this inhabits shallow or comparatively shallow water. 
It is abundant and widely distributed in the waters of northern Europe 
(White Sea, Nova Zembla, Murman coast, Norway, Spitzbergen, etc.), 
Iceland, Greenland, Davis Straits, Baffin's Bay; and Labrador. In 
the region covered by this paper it occurs in the Gulf of Saint Lawrence, 
on the Banks of Newfoundland, the Nova Scotian coast. Bay of Fundy, 
Casco Bay, Cashe's Ledge, Jeffrey's Ledge, Massachusetts Bay, and 
Stellwagen's Bank, being exceedingly abundant in the northern part 
of the region. The most southern localities are some distance off the 
coast : 
Station 2524 (N. lat. 41° 48' 45", W. long. 65° 47', 85 fathoms, sand, gravel, 
stones). 
