20 McMURRICH. Vor. Iii: 
The margin is crenate, the indentations corresponding to the 
insertions of the mesenteries. It is somewhat elevated, so as 
to form a slight collar, separated by a naked area from the ten- 
tacles. These are smooth, cylindrical, and only slightly entac- 
mzous. They are 96 in number, and are arranged according 
to the formula, 6, 6, 12, 24, 48, although they appear to be in 
four cycles only. Pores are present at their extremities, as was 
shown by the jets of water which issued therefrom when the 
animal was induced to contract suddenly, but I was unable to 
demonstrate any openings in my sections. The ectodermal 
muscles are arranged on well-marked elevations of the mesogloea 
(Pl. III., Fig. 5), which occasionally, but not very frequently, 
anastomose, thus enclosing a number of muscle-cells within the 
mesogloea. The disc is concave and smooth, and considerably 
broader than the column, measuring in the extended condition 
II cm. in diameter, and in the expanded condition about 18 cm. 
The ectodermal muscles are arranged similarly to those of the 
tentacles. The mouth is large, and the peristome not markedly 
elevated. The gonidia are large and prominent, and colored 
similarly to the disc. 
There are 12 perfect mesenteries, 12 which are attached to 
the stomodzum for about half its length, but are free below, 
and 24 which are quite imperfect, or united to the stomodzeum 
only toa very slight extent. The longitudinal and parieto-basilar 
muscles are well developed, a characteristic of the former being 
the difference in the length of the various mesogloeal processes, 
whereby the bands have a sinuous outline in transverse sections 
(Pl. III., Fig. 6). The mesenteries of all the cycles, with the 
exception of the directives, are gonophoric. Only the inner 
mesenterial stomata are present. 
The points in which Duchassaing and Michelotti’s description 
of Condylactis passifiora (’66) differs from the specimens obtained 
by me are principally that these authors state that the column 
is provided with ‘“tuberculis parvis sparsis: numerosisque,” 
and, secondly, they do not describe the tentacles as possessing 
crimson tips. As regards this latter point, as stated above, I 
obtained some specimens in which this striking coloration of 
the tentacles was wanting. The absence of the tubercles seems, 
however, more important. In the figure which Duchassaing 
and Michelotti give (66, Pl. V., Fig. 7) they are represented as 
