66 ROYAL SOCIETY OF CANADA 
formalin was more or less wrinkled, but showed no signs of verruce; 
in living specimens it appeared quite smooth, although inspection with 
a lens revealed minute white dots scattered over the surface. The exam- 
ination of sections did not, however, yield any distinct evidence of the 
occurrence of verrucæ. The margin formed a distinct fold, a fosse in- 
tervening between it and the bases of the tentacles. 
The spincter (Pl. II, fig. 2), was of the palmate circumscribed 
type, although the central axis was somewhat elongated. The lamellæ 
were delicate and very numerous, showing a tendency to anastomose in 
certain areas, and especially towards the base, to form a reticulum. 
The tentacles, when fully expanded, are stout and obtusely pointed 
at the tips, but show little or no signs of being longitudinally ridged. 
In contraction, however, the existence of longitudinal ridges is very 
evident. A good deal of variation exists with regard to the arrangement 
of the longitudinal muscles. In one of the two large forms examined 
these were ectodermal throughout the greater part of the circumference 
of the tentacles (Pl. II, fig. 4); but in one part a very thin layer 
of mesoglcea connected the tips of the supporting lamellæ, so that the 
musculature might be said to be mesoglæal. In the other individual 
the musculature was completely imbedded in the mesoglæa through- 
out the entire circumference, the cavities forming, for the most part, 
a single row situated but a short distance from the ectodermal surface 
of the mesoglea (Pl. Il, fig. 3). In neither individual was the 
radiating musculature of the disk distinctly imbedded in the mesoglcea, 
although in the second individual a certain amount of anastomosis 
between the supporting lamellæ occurred. 
Two well marked siphonoglyphs were present. The mesenteries 
were arranged in four cycles and were on a decamerous plan. In one 
half the circumference of one of the large individuals, from one pair of 
directives to the other, I found five pairs of the first cycle, five of the 
second, ten of the third and nineteen of the fourth, one member of this 
cycle, that succeeding the first member of the second cycle next one of 
the directives, being wanting. The members of the first, second and 
third cycles were perfect, those of the third only partially so, while those 
of the fourth cycle were imperfect. The longitudinal musculature 
was well developed, the supporting processes gradually increasing in 
height toward the stomatodeum, and terminating abruptly at the 
central edge of the muscle (PI. III, fig. 5). The parieto-basilar forms 
a distinct fold, which, in the older mesenteries is fused throughout almost 
its entire length to the mesogloea of the mesentery, the line of fusion 
being plainly indicated by a series of epithelial inclusions inthe mesoglæa. 
The basilar muscles have the form of distinct folds projecting from the 
bases of the mesenteries and bearing lateral lamellæ arranged in a 
