VAN NAME: SIMPLE ASCIDIANS. ' 465 
orange colored hepatic glands. Ovaries large, whitish. Color of 
test, pale hyaline bluish; tubes toward the end, dull neutral tint, 
diameter of the largest specimens about 1 inch. 
"Mass. Bay, — L. Agassiz; Long Island — Coll. Peabody Acad- 
emy of Science; Bird Shoal near Beaufort, N. C. — Dr. H. C. 
Yarrow." 
The chief distinguishing characters are evidently the thin trans- 
parent test, nearly or quite free from incrusting material and the 
non-retractile siphons. There are specimens in the collection labeled 
Molgula pcUucida from Huntington Bay, Long Island, which were 
collected by Dr. Tellkampf. They may be Professor Verrill's types. 
There are also examples apparently intermediate between them and 
the ordinary pilularis from many localities along the New England 
coast. Specimens from North Carolina, collected by Dr. Yarrow are 
also in the collection, and differ more from the typical pilularis than 
Tellkampf's specimens do, having long, tapering, very tough non- 
retractile siphons, and the thin but tough test practically free from 
incrusting sand, which is characteristic of this variety. 
Assuming provisionally that these forms are all of one variable 
species, B. pilularis ranges from the Gulf of Saint Lawrence (Mingan 
Islands, 50 fathoms, Whiteaves, 1901) if not from still farther north, 
to North Carolina, and is found in depths from ^ to 120 fathoms. 
It is very abundant in many localities, though from its habit of lying 
buried in the sand or mud it is readily overlooked. In other parts 
of its range it does not appear to grow as large as near Cape Cod, in 
Buzzards Bay, and Vineyard Sound. Off Race Point, Cape Cod, 
is perhaps the most favorable locality. There Professor Verrill 
found very large specimens cast up on the beach in immense numbers 
after a storm. Often several large individuals would be found 
attached together. 
The localities of specimens examined by the writer are as follow's: 
10 miles north of Shediac, N. B. (collected by J. F. Whiteaves). 
Stations 85, 86 (off Chebucto Head, Nova Scotia, 101 fathoms). 
Stations 56-58, 72, 73, 97 (in and about Halifax Harbor, Nova Scotia, 16 to 
18 fathoms, sand). 
Bay of Fundy, off Grand Manan (soft mud). 
Eastport, Me., and South Bay, Lubec, Me. 
Casco Bay (collected by M. M. Metcalf). 
Baker's Island, Salem, Mass. 
Race Point, Cape Cod (many very large specimens, as above noted). 
