PEDAL LACERATION IN ACTINIANS. 



93 



Mesenterien gehoren einem zweiten Cyklus an. An jeder Seite 

 der Richtungsmesenterien findet man auch unvollstandige 

 Mesenterien eines zweiten Cyklus. Auch einige Mesenterien 

 der dritten Ordnung sind angedeutet (Fig. 7, Taf. IX.). An 



Rm 



Rm 



Rm 



Rm 



FIG. 2. (Carlgren's Fig. 7, Taf. IX.) 



der Bases sind die mit (a) bezeichneten Mesenterien am Starksten, 

 die Mesenterien (a) an der rechten Seite der Sagittalachse laufen 

 fast mit den entsprechenden Mesenterien an der anderen zusam- 

 men (Fig. 7, Taf. IX.). 



His Fig. 4, Taf. IX., my text Fig. 2, shows a condition of the 

 mesenteries which is common to all laceration embryos in a cor- 

 responding stage of development. His Fig. 7, Taf. IX , text 

 Fig. 3, shows twenty-five mesenteries, eight of which he considers 

 to be of the first cycle (mesenteries marked a) while of the re- 

 maining seventeen six are according to his statement of the 

 second cycle (marked b~) and the remainder of a third cycle. It 

 will be noticed that several of the mesenteries in this figure- 

 one pair of those marked Rm and the longest ones at one end of 

 the figure are very broad in section with a thick mass of endo- 

 derm extending far beyond the mesoglea. None of the entire 

 number of mesenteries have any trace of mesenteric filaments, 

 nor by their structure, in so far as it can be made out from the 

 original figures, is there any indication that they contain actively 



