544 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
The specimens studied, which included Verrill's types of C. ianneri^ 
were from : 
Station 2041 (N. lat. 39° 22' 50", W. long. 68° 25', 1608 fathoms, Globi- 
gerina ooze), one large specimen (type). 
Station 2714 (N. lat. 38° 22', W. long. 70° 17' 30", 1825 fathoms, brown 
ooze), two rather small specimens (also labeled types). 
Station 2713 (N. lat. 38° 20', W. long. 70° 08' 30", 1859 fathoms, brown 
ooze), seven small specimens; not dissected. 
Station 2566 (N. lat. 37° 23', W. long. 68° 08', 2620 fathoms, gray ooze). 
The records in the Peabody Museum mention this species also 
from two other stations, which the writer gives without having exam- 
ined the specimens : 
Station 2099 (N. lat. 37° 12' 20", W. long. 69° 39', 2919 fathoms, Globigerina 
ooze) . 
Station 2226 (N. lat. 37° 00', W. long. 71° 54', 2045 fathoms, Globigerina 
ooze). 
Family TETHYIDAE Hartmeyer, 1908. 
[=STYELIDAE auct. plur.]. 
(This includes two subfamilies of simple ascidians, Pelonaiinae 
Seeliger, 1907, and Tethyinae Hartmeyer, 1908 [Styelinae], with char- 
acters as below, and Polyzoinae Hartmeyer, 1903, consisting of com- 
pound ascidians which reproduce by budding and form colonies. 
The latter subfamily has not been found in the New England 
region). 
Test usually tough, opaque, and leathery; apertures as a rule 
both four-lobed. 
Tentacles simple. 
Branchial sac regularly with four longitudinal folds on each side 
(rarely with a rudimentary fifth fold), but some or even all of these 
may be reduced, rudimentary, or entirely wanting. Stigmata usually 
straight, never arranged in spirals. 
Intestine on the left side of body (posterior to branchial sac in 
the genus Pelonaia only). Stomach usually clearly differentiated 
from the intestine; no liver. 
Reproductive organs sometimes on one, but much more frequently 
on both sides of body. 
