VAN NAME: COMPOUND ASCIDIANS. 
413 
these are nearly as lonu; as the main por- 
tion of the lano'uet, in others they are 
very rudimentary or entirely wanting. 
The oral tentacles are distinguished 
with difficulty, owing to the contracted 
state of all the specimens, but there ap- 
pear to be about 12 in all, of two sizes 
arranged alternately. There are about 
11 or 12 rows of stigmata with apparently 
a maximmn of about 18 in a row on each 
side in the few specimens that were in a 
condition to show these structures. Dor- 
sal languets are probably present, but 
were not distinguishable. The trans- 
verse vessels are muscular. 
The intestinal loop is twisted, bringing 
the stomach to the dorsal side, the in- 
testine crossing the esophagus to the left 
of the latter. The stomach has as a rule 
a rather small number, 12 or 15, of deep 
longitudinal folds, but in some colonies 
the number averages higher, about 18 or 
20 or even more. Irregularities in the 
folds sometimes occur, but more often 
they are quite regular and uniform in 
width, and extend the full length of the 
stomach. In respect to the reproductive 
organs, it resembles the last-described 
species. 
This species is found from the Banks 
of Newfoundland and the Gulf of St. 
Lawrence to southern Massachusetts and 
Rhode Island. It seems to prefer a 
rocky or gravelly bottom. 
To consider its distribution more in 
detail, it is recorded by Verrill (1872) 
from Murray Bay in the lower St. 
Lawrence, and l)y ^Yhiteaves (1901) 
from Bonaventure Island, 50 fathoms, 
Orphan Bank, and Gaspe Bay. It is 
^\J1P 
m 
fp- 
sd 
Text - fig. 24. — Amaroucium 
glabrum Verrill. Zooid. X 34. 
