592 F A. Potts, 



aphrodite reaching this conclusion after exainining sections of four 

 individuals which he was able to obtain. I submitted my collection 

 of Sißon to Mr. Smith and lie asks me to State, in support of his 

 former assertion, tliat four more individuals of varying sizes were 

 sectioned and in none of tliem could a testis be found. 



It may then be stated tliat in three g-enera of the Ehizocephala 

 Sylon, Sesarmoxenos and Mycetomorpha careful examination lias not 

 revealed the presence of the male organ or the occurrence of larval 

 males. The presumption, then, is that these forms reproduce partheno- 

 genetically, but it is of great importance that an investigation of 

 their reproduction should be undertaken in some locality like Fuget 

 Sound, where one of the forms. at least. can be obtained in quantity. 



Bibliography. 



1. Annandale, in: Eecords Ind. Mus. Calcutta, Vol. 6 (1911), p. 1 — 4. 



2. Calman , On a collection of Crustacea froin Fuget Sound, in: Ann. 



New York Acad. Sc, Vol. 11, 1898, p. 259. 



3. Delage , Evolution de la Sacculine , in: Arch. Zool. exper. (2), 



Vol. 1, 1884, p. 417—738, tab. 22—30. 



4. KOSSMANN, Beiträge zur Anatomie schmarotzender ßankenfüsslei*, in: 



Arb. zool.-zoot. Inst. Würzburg, Vol. 1, 1874, p. 97. 



5. Smith, G. W., Ehizocephala, in: Fauna Flora Golf Neapel, Vol. 19,. 



p. 1—123, tab. 1 — 8. 



