234 J- Playfair McMürrich, 



GEEN finds never more than thirt3"-two in B. octoradiatus, aud since 

 the first form anatomicall}^ stiidied to be ideiitiüed witli Couthouy's 

 A. cruentata was the Actiniid and not the Bunodid, the name given the 

 latter by Carlgeen must be retained for it and the Actiniid regarded 

 as the form described by Couthouy, 



The majority of the individuals in the present collection are 

 much more fnlly expanded than were those which I originally 

 studied and their average height is about 1.5 cm and the dianieter 

 of the column about 1.0 cm. 



According to the label which accompanied specimens No. 590, 

 the basal portion of the column was rosecolored, while the upper 

 portion and the tentacles were deep carmine witli flecks of grey. 

 Tills account agrees very well with that given by Couthout, but 

 the species is apparently liable to considerable Variation in color, 

 since the specimens studied by Carlgeen were in some cases oliva- 

 ceous with greyish tentacles, in others white with greyish-green 

 tentacles and in others the tentacles were carmine only at the tips. 



The base is adherent and the column flnely corrugated in its 

 proximal part and distally is provided with longitudinal rows of 

 arge and well marked Verrucae to which particles of sand adhere 

 with considerable firmness. Each alternate row is somewhat longer 

 than the adjacent ones, but even the longer ones do not extend 

 beyond the middle of the column. The margin forms a distinct 

 parapet and in the more perfectly expanded individuals can be seen 

 to bear marked papillae opposite the extremities of the longer rows 

 of Verrucae and smaller ones opposite the shorter rows. These 

 papillae present a strong superficial resemblance to acrorhagi, but 

 they do not show any special development of nematocysts, agreeing 

 in their histological structure with the column wall. 



The tentacles are separated from the margin by a distinct fosse 

 and are short and blunt. They are arranged in about two cycles, 

 each of which, in one individual in which a count was made, con- 

 tained sixteen tentacles. As alreadj^ stated, however, Dana states 

 that the tentacles are forty-six in number and Carlgeen found 

 the number to vary from forty to forty-eight. As will be seen later 

 both octamerous and hexamerous individuals occur, a fact which 

 explains these discrepancies. The disc is smooth and the stomato- 

 daeum is longitudinally ridged and possesses two siphonoglyphs. 



Structure. The circular musculature of the column wall is 

 but moderately developed and the sphincter is diffuse and very 



