ANEMONES 



399 



In order that the subsequent discussion may be intelligible, the 

 accompanying tables are introduced. 



TABLE I. MONOGLYPHIC AND DIGLYPHIC TYPES OF POLYPS. 



The polyps from Oakland in Table I were gathered with the utmost 

 precaution against statistical errors ; so that I am at a loss to account 

 for the discrepancy between Parker's figures and my own, save on 

 the ground of different environments.^ 



TABLE II. MONOGLYPHIC TYPE OF POLYPS. 



The correspondences in Table II are closer. This table is arranged 

 to show the variation in number of mesenteries among monoglyphic 

 individuals from three localities. The fractions in the column for non- 

 directives indicate the perfect mesenteries which have no mates. 

 Thus, f indicates two unpaired perfect mesenteries (or half-pairs). 

 The number of polyps possessing such mesenteries is remarkably 

 large in the Oakland material. Parker did not note them in his tabu- 

 lation of Newport specimens, though he remarked their occurrence. 



' Carlgren (1893, p. 104) sajs that usually there is but one siphonogljph in 

 Af. dianthus. The same fact was pointed out by G. Y. and A. F. Dixon in 1S91. 



