432 » The American Naturalist. [May, 
Antennularia, which closely resembles Grammaria, which has 
never been found in the Bay of Fundy, was taken on several 
excursions. Halecium, a hydroid not described by Stimpson, but 
not unknown from Grand Manan, is one of the most common of 
the hydroids observed, while Eudendrium, Tubularia, Corymor- 
pha, Clava, Campanularia, and various genera of Plumularidz and 
Sertularide are very abundant. There is no subject which would 
yield better results in the study of our marine animals than that 
of the hydroids of the waters about Grand Manan. Very little 
research on these animals from the Bay of Fundy has yet been 
carried on. 
A genus allied to Myriothela also occurs at Grand Manan. The 
genus called Acaulis was discovered at Grand Manan, and de- 
scribed by Stimpson, who failed, however, to recognize its affini- 
ties with Myriothela. The true relation of the genus Acaulis 
has been for many years*® problematical with me, and I have 
been led to regard it as the broken head of a 
Tubularian, following the opinion of several well- 
known naturalists in this identification. A 
study of the living specimens of Myriothela, and 
an examination of the unpublished figures of the 
Eastport representative, made over ten years ago 
by Professor Hyatt, and loaned to me for study, 
leads me to place Acaulis in the neighborhood 
of Myriothela, retaining Stimpson’s name for it 
until a new examination can be made to deter- 
mine its true systematic position. Stimpson’s 
description is quoted below verbatim, in order 
that what is at present known of this animal may 
preface a few conclusions of my own, drawn from Fic. 2.— ! 
s è n % (A. Hyatt, del). 
an examination of Prof. Hyatt’s drawings. i 
Stimpson’s account of Acaulis [“ Invertebrata of Grand Manan ] 
is as follows: 

5 My examination of ‘specimens of Myriothela found at Roscoff, France, convinced 
me that Acaulis is a close ally of this interesting genus. On several visits to 
and Grand Manan I have repeatedly looked for both Myriothela and Acaulis, but have 
never been able to find either. 



