342 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY, 
VerriU's name. 
Lissoclinum tenerum. 
Lissoclinum aureiim. 
M acroclinvni crater. 
A m aroecium pallid u m . 
Amaroecium pellucidum. 
(= Alcyotiidium ? pel- 
lucidum Leidy.) 
A maroec iu m co n Stella turn. 
Amaroecium glabrum. 
Amaroecium stellatum . 
N'ame here adopted. 
Didemnopsis tenerum (Verrill), 1871. 
No change. 
Macroclinum pomum (Sars), 1851. 
Apliditim pallidum (Verrill), 1871. 
Amaroucium iK-llucidum (Leidy), 
1855. 
Amaroucium pellucidum form con- 
stellatum (Verrill), 1871. 
Amaroucium glabrum (Verrill), 1871. 
Amaroucium stellatum (Verrill), 1871. 
As shown in the above hst, two prove not to be vahd species. How- 
ever, under the term Leptoclinum albidum (or L. luteolum, if the speci- 
men happened to have a yellowish, orange, or pinkish tint) two very 
different species, which should be placed in different genera, have been 
confused. One of these is, as explained below, a well known Euro- 
pean form; the other the writer cannot satisfactorily identify, and he 
has therefore been obliged to describe it as new. Three other forms 
can now be added to the list of those inhabiting this region, though 
one is a deep-water species which does not occur near the shore. The 
list of New England species should therefore be completed as follows; 
VerriU's name. 
Leptoclinum albidum (part) 
+ Leptoclinum luteolum 
(part) . 
Not recorded by Verrill. 
Not recorded by Verrill. 
Not recorded bv 'S'errill. 
Name here adop'ed. 
Didemnun> lutariuni n. sp. 
Holozoa clavata (Sar.s), 1851. 
Pohjcitor kiikenthali (Ciottschaldt), 
1894. 
Leptoclinides faeroensis Bjerkan, 1905. 
This is a total of 15 species, representing 13 genera and 5 families 
(see synopsis on p. 344-3-' 6), and is exclusive of the free-swimming 
pelagic family Pyrosomidae, which is represented in New England 
waters, but which is not included in the scope of the ])resent paper. 
In this connection it should further be mentioned that among the 
material collected by the steamer Albatross in the deep water off the 
New England coast, there are a few specimens of compound ascidians 
in too poor condition to determine whether or not they belong to 
