ASEXUAL REPRODUCTION IN SAGARTIA 211 



Specimen no. 80, table 7, gives similar evidence. The nmnber 

 of orange stripes and their position in relation to the new area 

 as observed before killing are shown in figure 37. It was noted 

 that possibly one of the orange stripes, here represented as 

 lying within the new area near one boundary, might be an old 

 stripe. Study of sections shows in the old part a pair of di- 

 rective mesenteries and an adjacent pair of non-directives of the 

 first incomplete grade, the plane of fission passing through 

 secondary incomplete endocoels lying lateral to these. The 

 two old and nine new orange stripes correspond in position with 

 the complete endocoels and the incomplete endocoels of the 

 first cycle. Evidently orange stripes were not produced in the 

 secondary incomplete endocoels occupying the boundary. As a 

 result of this position of the division plane, on one side there is a 

 space between two pairs of complete mesenteries that does not 

 contain a pair of incomplete mesenteries of the highest grade. 

 In all probability there was no orange stripe in this region — two 

 adjacent orange stripes occupying complete endocoels. This 

 illustrated the seldom realized possibility of the normal pro- 

 duction of a fully regenerated specimen with an odd number of 

 stripes, one less than twice the number of pairs of complete 

 mesenteries. Another specimen showed exactly the same ar- 

 rangement of complete mesenteries, incomplete mesenteries of 

 the first order, and orange stripes, but with the position of the 

 bounding planes no longer evident. Another specimen with 

 twenty-one orange stripes and eleven pairs of complete mesen- 

 teries is similarly explained. Sections of this individual give 

 evidence of two regenerating regions, both in a very late stage. 

 Probably three of the four division planes involved passed 

 through complete endocoels; one evidently cut an incomplete 

 endocoel of the second order. Both old and new mesenteries 

 bounding the latter endocoel are clearly of the second order. 

 This is the only region bounded by pairs of complete mesen- 

 teries in which representatives of the first cycle of incomplete 

 mesenteries are lacking. Undoubtedly this accounts for the 

 lack of one orange stripe from the number usually found in a 

 specimen with eleven pairs of complete mesenteries. Anemone 



