226 C. W. Hahu. 



The siphonoglvph is a groove in the oesophagus, covered with 

 ciHa, which tend to set up a current of water into the polyp. The 

 relative abundance ot monoglyphic, diglyphic and triglyphic 

 Metridia, as indicated by observations of Torrey ('98), Parker 

 ('99), and myself, is shown in Table I. Monoglyphic polyps, it 

 will be observed, predominate in all localities examined, though 

 the proportion varies within wide limits. The large and small 



Table I. 



Total No. Number Number Per cent 



j Counted. Diglyphir. Monoglyphic. Monoglyphic. 



Newport, R. I. (Parker) 



Oakland, Cal. (Torrey) 



Salem, Mass 



Lynn, Mass 



Woods Hole, Mass 



polyps from the same locality occur with about the same pro- 

 portion of monoglyphic to diglyphic forms. There is no dis- 

 coverable correlation with any variation in color or in structure, 

 save the constantly associated pair of directive mesenteries and 

 perhaps certain irregularities of the non-directive mesenteries. 

 These structures have been investigated by Parker ('97, '99)- 

 He finds the diglvphic character to be associated more often with 

 regularity in the number and arrangement of the non-directive 

 mesenteries. But the variations in the mesenteries are not con- 

 formable to any known laws and cannot be regarded as of specific 

 importance. 



My first experiments were directed toward discovering whether 

 monoglyphic and diglyphic polyps produce, in asexual reproduc- 

 tion, each its own sort only. The result obtained gave an emphatic 

 negative to this hypothesis. Each sort was found to produce, 

 by asexual methods, both monoglyphic and diglyphic polyps, 

 monoglyphic individuals predominating among the young in 

 both cases. 



Two methods of inducing multiplication were employed. The 

 anemones were, in some cases, divided into halves by a vertical 

 cut, so as to produce artificially specimens equivalent to those 



