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No. 13.— SIMPLE ASCIDIANS OF THE COASTS OF NEW 
ENGLAND AND NEIGHBORING BRITISH PROVINCES. 
BY WILLARD G. VAN NAME, Ph. D, 
» 
In a previous paper the writer has given an account of the compound 
ascidians of the region from the Gulf of Saint Lawrence to Long 
Island Sound, inclusive. In the present paper the simple ascidians 
of the same region are dealt with and, as before, the account is based 
chiefly on a study of the extensive collections belonging to and de- 
posited in the Peabody Museum of Yale University. 
As this is practically a continuation of the paper dealing with the 
compound ascidians, it will be unnecessary to repeat all the prelimi- 
nary statements there made concerning the work, and it will suffice to 
state that the collections studied were made chiefly by Professor 
A. E. Verrill, Professor S. I. Smith, H. E. Webster, O. Harger, and 
others associated with them, during 1868 and 1870, and by the United 
States Commission of Fish and Fisheries from 1871 to 1887 inclusive, 
and include specimens from deep water as well as from near the 
shore. Much of the material is the property of the United States 
National Museum. Smaller lots of specimens from various sources, 
including some collected by the writer himself, have also been studied, 
so that the geographical area dealt with in this paper has been well 
covered. Advantage has also been taken of this opportunity to 
describe and figure several deep-water forms collected by the steamer 
Albatross at stations too far from the coast to justify considering them 
as belonging to the New England fauna. The specimens from which 
the figures and descriptions were prepared were all, as far as the 
writer is aware, collected in summer, or not later than September. 
While collecting at other seasons might not result in finding other 
species, it would be likely to disclose facts regarding the development, 
growth, and reproduction of these animals which the summer speci- 
mens do not show. 
The curators of the Peabody Museum, Professor W. R. Coe and 
Miss Katharine J. Bush, Ph.D., have kindly allowed the writer the 
advantage of every facility afforded by the Museum for the prepara- 
tion of this paper, and by their interest and readiness to assist have 
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