260 CHAS. W. HARGITT, 



dem), and the smaller as invariably in the entoderm, as shown in 

 Fig. 1. The inference would seem to be warranted that their origin 

 is in the latter tissue from which they migrate into the ectoderm 

 through which they further migrate to the gonophores. I have not 

 been able to certainly demonstrate the actual passage of ova from the 

 one tissue to the other as Wetsmann seems to have done, or as 

 Brauer has figured in the case of Tuhularia mesemhrmnthemum, 

 though do not question it as a fact. 



2) In E. dispar Ag. there were found identical conditions to those 

 described for E. racemosum. Ova abound in both tissues, but the 

 larger and more mature are found invariably in the ectoderm. In the 

 region of the hydranth ova were found, as in other portions of the 

 body, but were here always approaching maturity. 



In a few cases a condition which had every appearance of the 

 passage of the egg directly through the supporting lamella was observed 

 in the region near the gonophores tho not elsewhere. Fig. 2 represents 

 a camera sketch of a long section of this hydroid showing the relative 

 size and position of ova. 



3) In E. tenue Ag. a distinctively diflerent condition was found. 

 This is a very minute hydroid and correspondingly difficult to study. 

 Only transverse sections were made, a camera sketch of one of which 

 is shown in Fig. 3. In no case were ova found in other than the 

 entoderm, as shown in the figure. The specimens were taken during 

 the height of the breeding season and with sexual products in all 

 stages of development. 



4) E. ramosum. As intimated above I have taken occasion to 

 carefully review my earlier work on this species with the result that 

 the later observations confirmed in every detail those originally made. 

 Fig. 4 presents an average condition found in this hydroid during its 

 reproductive season. 



5) An examination of Eudendrium capillare Alder confirms in 

 almost every detail Weismann's conclusions and are in such perfect 

 accord with the conditions found in E. tenue as to further suggest the 

 long suspected identity of these species. I should state that in a single 

 case among hundreds of sections of this hydroid there was found an 

 egg in the ectoderm in the region of a gonophore, which was ap- 

 proaching the state of maturity usually attained about this time, which 

 suggests the probability that it had passed into the ectoderm in this 

 region in approaching the gonophore during the process of migration 

 thitherward. 



