[MCMURRICH] THE ACTINIARIA OF PASSAMAQUODDY BAY 77 
endodermal circumscribed sphincter of the form shown in fig. 7, and 
which may perhaps be best referred to the palmate type. The longi- 
tudinal musculature of the tentacles is throughout ectodermal as is also 
the radial musculature of the disk. Two siphonoglyphs were present 
in all the specimens examined, their walls being greatly thickened in a 
manner similar to what I have described for Cribrina elegantissima 
(MeMurrich, 1901). 
The mesenteries are arranged in four cycles and are on an hexam- 
erous plan, which is imperfect only to the extent that some of the 
mesenteries (and tentacles) of the last cycle may fail to develop. 
Those of the first and second cycles are perfect, the rest imperfect. The 
longitudinal muscles form a diffuse pennon, the supporting lamellæ 
increasing rapidly in height at its outer border and tapering gradually 
towards the central edge (Pl. III fig. 6). The parieto-basilars form 
distinct folds and the basilars are strong stout processes bearing second- 
ary lamellæ. In none of the examples studied were the reproductive 
cells well developed, the breeding season being, apparently, shortly 
before the time of my visit to St. Andrews (the end of May), since one of 
the individuals captured gave birth to a number of larve in various 
stages of development when placed in an aquarium. In one individual 
I observed immature ova in some of the mesenteries of the second and 
third cyeles, but whether they are confined to these mesenteries when 
fully developed cannot be stated. 
The fact that three out of four of the species described in this 
paper are identical with European forms suggests a possibility that the 
one now under consideration may also be identical with a European 
species, and that which naturally comes first to mind is C. verrucosa. 
C. stella lacks, however, the longitudinal bands of colour seen on the 
column of that form and, what is of more importance, its sphincter is 
much stronger and more complicated than that which G. Y. and A. F. 
Dixon (1889), figure for C. verrucosa. It presents much more similarity 
to C. thallia both in coloration and in the form of the sphincter, this 
latter in thallia, according to the Dixons, resembling that described 
by R. Hertwig (1882) for his Tealia bunodiformis. I have not, how- 
ever, found that variability in the arrangement of the mesenteries 
which the Dixons described for C. thallia, and, furthermore, it is to be 
noted that both that form and C. verrucosa are of a somewhat more 
austral distribution than are the other European species represented 
on the western side of the Atlantic. It seems advisable, therefore, until 
direct comparison can be made, to regard C. stella as a distinct species. 
STOMPHIA COCCINEA (O. F. MULLER) CARLGREN. 
The American representative of this species was first described by 
Stimpson (1853) as Actinia carneola, and in 1858 Sir William Dawson 
