228 J- Playfair Mc Mureich, 



of tlie base 1.75 cm, lieiglit of the column 1 cm, diameter of tlie 

 coliimn at the margin 1.1 cm, wliile tlie corresponding measnrements 

 of the smallest were 0.9 cm, 0.6 cm, and 0.7 cm. The specimens 

 numbered 309 and 257 were still smaller, measuring 0.45 — 0.3 cm 

 in height with a basal diameter of 0.65 — 0.35 cm, and they are 

 evidently immature, althongh no indications of reproductive organs 

 were found in any of the specimens. 



Accompanying the specimens No. 309 was a label which read 

 "Junge Actinien der gemeinsten braunrothen Art", and it must be 

 conclnded, in the absence of any definite statement, that specimens 

 No. 91a were adiilt and had, during life, a brownish-red colour. In 

 their present condition there is little evidence of what the color 

 may have been. 



The base in all the specimens is more or less expanded (Fig. 6); 

 the column is cylindrical, tapering but slightly above, and, except 

 for wrinkles diie to contraction, is quite smooth, having no Verrucae 

 or papillae. The margin is distinct and quite smooth and is separated 

 by a relatively deep fosse from the bases of the outer tentacles. 

 The tentacles are, as a rule, only partly concealed and are short 

 stout and obtuse. Theoretically their number should be thirty-six, 

 but apparently the last cycle is incompletely developed, since I was 

 able to count only seventy-five in one specimen and in another only 

 sixty-four. The disc and mouth are concealed from view in all the 

 specimens. 



S t r u c t u r e. The mesogloea of the column wall is much thinner 

 than the ectoderm and the processes for the support of the endo- 

 dermal musculature are but feebly developed. Sections through the 

 Upper part of the column (Fig. 7) show that the margin forms a well 

 defined parapet, upon the inner wall of which is situated a distinct 

 though weak diffuse endodermal sphincter. A few scattered nemato- 

 cysts occur in the ectoderm of the parapet, but they are not aggre- 

 gated to form acrorhagi and the margin of the parapet is practi- 

 cally quite smooth. In some of the young specimens which are 

 well expanded this parapet cannot be seen, and it is probable that 

 it may be smoothed out even in adult individuals during complete 

 expansion. 



In the adults the endoderm of the upper part of the column 

 contains a considerable amount of brownish pigment in the form 

 of granules and a few zooxanthellae are also present; the young 

 specimens show indications of the same kind of pigment, but it is 



