REPORT ON ACTINIARIA. 235 



most cycle were decidedly longer than those situated more 

 peripherally and measured about 0.4 cm. in length. A faint 

 rose-purple color persisted in the tentacles, but it was faint, 

 the color of the entire specimen having been almost entirely 

 extracted by the alcohol in which it was preserved. The disk 

 and peristome could not be examined owing to the manner of 

 contraction. 



Sections through the column showed that the mesenteries 

 were arranged in five cycles, of which only one cycle, consist- 

 ing of six pairs, was perfect. Two pairs of directives were 

 present. The fifth cycle was not quite complete in its develop- 

 ment, some of the interspaces being destitute of representatives 

 of it, and. throughout, its mesenteries were small and possessed 

 no mesenterial filaments. Acontia were present but were few 

 in number. The longitudinal musculature was only moderately 

 developed, the mesoglceal processes covering a considerable 

 portion of the surfaces of the mesenteries at the level of the 

 lower part of the stomatodaeum. but not being very high ( PI. 1, 

 Fig. 7 ). No parieto-basilar or basilar muscles were observed. 

 The reproductive organs were borne upon the mesenteries of 

 the second, third and fourth cycles, the specimen being a male. 



The stomatodaeum possessed two well developed siphonog- 

 lyphs and also was furnished with a number of longitudinal 

 ridges, each of which was supported by an elevation of the 

 mesogloea. 



The sphincter muscle was mesoglceal and well developed. 

 It has a general triangular shape, occupying almost the entire 

 thickness of the mesoglcea above but tapering off somewhat 

 below, where it lies nearer the endodermal than the ectoder- 

 mal surface (PI. 1. Fig. 6). Above it is finely reticular, bands 

 of mesoglcea extending transversely from the inner to the 

 outer surface of the muscle area, finer longitudinal strands 

 breaking the intervals between successive bands into smaller 

 compartments which are lined bv the muscle cells supported 

 on processes which project into the compartments (PI. 11, 

 Fig. 1). About the middle of the muscle some of the longi- 

 tudinal strands become thicker, and. being placed as it were 



