VAN NAME: SIMPLE ASCIDIANS. 595 
with it provisionally, is from Station 236 (near Cape Ann, Massa- 
chusetts, N. lat. 42° 28', W. long. 70° 31', 28 fathoms, rock, coarse 
sand, and pebbles). 
Family PHALLUSIIDAE Traustedt, 1883. 
[= ASCIDIIDAE auct. plur.]. 
Branchial aperture usually with eight (or seven) lobes; atrial aper- 
ture usually with six lobes. 
Tentacles simple. 
Dorsal lamina plain-edged or toothed, but not broken up into sepa- 
rate languets. 
Branchial sac without large longitudinal folds but generally exhibit- 
ing a minute plication or fluting. Internal longitudinal vessels present 
and usually provided with papillae at the intersections with the trans- 
verse vessels and in some species also at intermediate points. Stig- 
mata straight. 
Alimentary tract on left side of body. 
Reproductive organs in and spreading over the intestinal loop. 
Genus Phallusia Savigny, 1816. 
[= AsciDiA auct. plur.]. 
This is the only genus of the family occurring in the New England 
region and apparently also the only very well characterized genus 
of the family. The above family characters will suffice for its recog- 
nition. 
It is represented in the collection by a very large number of speci- 
mens, but though many of them were dissected, no other species were 
recognized than the two next following, both of which were recorded 
by Verrill, though under other names. A third species was described 
by Verrill from a single specimen, but is of doubtful validity. 
Key to Species. 
Internal longitudinal vessels with papillae at intersections with transverse 
vessels onty obliqua. 
Internal longitudinal vessels with papillae at intersections with transverse 
vessels and also midway between the intersections prunum. 
