282 Transactions of the Societti. 



some which seemed to be surrounded by bodies resembling sperma- 

 tozoa ; he kindly drew my attention to these examples, and allowed 

 me to restain certain of his Sycon slides, from which I was able to 

 come to a definite opinion that these bodies in question resembled 

 the ordinary metazoon sperm in detail, and had a tail sheath 

 staining in crystal violet. While it is possible to identify these as 

 spermatozoa, the evidence that they are sponge sperms is much 

 less complete ; but two facts must be borne in mind : the sperm 

 in Siyongilla, according to Gorich, is filiform and flagellate ; the 

 sperms in Mr. Huxley's slides were definitely attracted by the 

 collar cell regenerate masses, and in some cases seem to have 

 penetrated into individual collar cells. The main bulk of evidence 

 is therefore that in the Syconidse the sperm is flagellate and filiform, 

 and this opinion is further supported by the figure 1 of PL Y. in 

 the present paper. 



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