IO MCMURRICH. {Vot. III. 
width of the mesentery. Towards the point of its insertion 
into the mesogloea of the column, that of the mesentery is some- 
what swollen and presents pinnately arranged rather short stout 
processes, those on one side belonging to the longitudinal muscle 
system, and those on the other to the parieto-basilar. Internally 
to this swelling the mesogloea becomes thinner and then begins 
to show on one surface only the muscular elevation belonging 
to the longitudinal system. These, at first small, lengthen 
gradually as they are traced outwards towards the inner edge 
of the mesentery until the largest is reached, when they sud- 
denly diminish, the muscle band internally having a rounded 
edge, while externally it slopes towards the general surface of 
the mesogloea. The parieto-basilar muscle is by no means strong. 
None of the forms examined, all of which were collected in 
July, have mature reproductive organs. Immature ova are to 
be seen, however, partly imbedded in the mesogloea and partly 
still forming elements of the endoderm layer. These occurred 
only in the mesenteries of the 2d and 3d cycles. 
The species described in the preceding pages seems to agree 
very well with Lesueur’s description of Actinza annulata (17), 
and I have little doubt as to its identity with that form. Du- 
chassaing and Michelotti do not, however, record it among the 
forms obtained by them in the West Indies, but, on the other 
hand, have described a form which they identify with Lesueur’s 
Actinia solifera, referring it in their earlier paper (60) to the 
genus Paractis, and in the later one to the genus novum Bar- 
tholomea ('66), which is identical with Gosse’s Azpfasza. It 
seems probable that A. solifera and A. annulata are identical, 
the differences being apparently mainly in coloration. The 
characters of A. solifera as deduced from the various descrip-. 
tions may be given as follows :—Column cylindrical, elongated, 
very contractile, marked with longitudinal striz of a reddish 
color, and provided with 2-3 rows of small cinclides from which 
acontia are emitted when the animal is handled. The disc is 
flat, and the peristome white, with two yellow bands opposite 
each other (at the gonidial angles, no doubt). The tentacles 
are very long, decidedly entacmzeous, in five or six cycles, and 
of a brown color annulated with white bands arranged in a 
broken spiral. When fully expanded the animal measures about 
2 cm. in diameter and 10 cm. in length. 
