REPORT ON THE HEXACTINI/E 43 



there are two siphonoglyphes, one of which is much deeper than 

 the other. 



The mesenteries are arranged in four cycles with occasional 

 representatives of a fifth. Twelve pairs are perfect in the upper 

 part of the body, but a little farther down, even above the 

 middle of the body, only the six primary pairs reach the stoma- 

 tod^eum. There are two pairs of directives. 



The longitudinal musculature of the mesenteries (Fig. 28) is 

 fairly well developed, but possesses no special features of in- 

 terest ; it gradually tapers off towards both edges and occupies 

 about half the muscular portion of the mesentery at the level of 

 the middle of the stomatodseum. The parieto-basilar in its 

 lower part does not form a special fold, but consists of a number 

 of processes arising directly from the surface of the outer por- 

 tions of the mesenteries, but above a slight fold is visible in 

 some of the mesenteries as shown in Fig. 28. The basilar 

 muscle has the appearance represented in Fig. 29. All the 

 mesenteries, with the exception of those of the first and fifth 

 cycles, are gonophoric. 



University of Michigan, February 22, 1901. 



LITERATURE 

 Andres, A. 



'83 Le Attinie 



Faicna u. Flora des Golfes von Neapel. Monogr. XI. 

 1883 

 Brandt, J. F. 



'35 Prodromus descriptionis animalium ab H. Mertensio 

 observatorum. 1835 

 Carlgren, 0. 



'93 Studien iiber Nordische Actinien. I 



KongL Svensk. Vet. Akad. HandL, XXV. 1893 

 Carlgren, 0. 



'99 Zoantharien. Hamburger Magalhaenische Sammelreise. 

 Hamburg. 1899 



