436 The American Naturalist. [May, 
would place it in the family ofthe Tubularide. To this view I am 
unable to assent, although it has received a certain measure of 
support from Prof. Allman. The Acaulis is furnished at first with 
a verticil of filiform tentacles near the base of the polypite (though 

. Fic. 1.—Adult Acaulis. a, terminal opening of the body—the interior of this body 
" dark reddish purple”; 4, central, purple-colored body wall; e, small papillae—these, 
as well as the external body wall, are light pink; d, ridges or folds in t ternal walls 
exterior, white granular; ¢, permanent tentacles—“ suctorial tentacles”; #¢, t 
tentacles, 
they are said to disappear subsequently), and between these and 
the upper capitate tentacles the reproductive buds are developed 
on the body. But Myriothela, so far as we know, is destitute of 
basal tentacles at all stages of its existence, and the gonophores, 

