44 



mann in seinen Notizen geliefert, die ich schon jetzt mittheilen will. 

 Boloceroides kann sich nämlich nach Stuhlmann dadurch von der 

 Unterlage losmachen , daß sie »mit den Tentakeln gleichzeitig schlagende 

 Schwimmbewegungen nach unten ausführt«. In dieser Hinsicht stimmt 

 Boloceroides mit Gonactinia überein, die nach Untersuchungen von 

 Prouho (Arch, de Zool. Exp. et Gen. (2.) 9. No. 2. p. 252. Paris 1891) 

 und mir (K. Svensk. Vet. Acad. Handl. 25. No. IO. p. 36. Stockholm 

 1893) ähnliche Bewegungen macht, um den Ort zu wechseln. 



Nachschrift. — Nachdem dieser Aufsatz geschrieben und zum 

 Druck eingegeben war, ist von meinem Freund und Collegen, H. C. 

 H ad don, eine Arbeit (The Actiniaria of Torres Straits. Sc. Trans. R. 

 Dublin Soc. Vol. 6. Ser. 2. P. 16. 1898) erschienen, in der auch er 

 für wahrscheinlich hält, daß Liponema und Polystomidium nicht 

 tentakellose, sondern mit abschnürbareu Tentakeln versehene Acti- 

 niarienformen sind. 



2. Januar 1899. 



4. A New Medusa from the Californìan Coast. 



By K. Kishinouye, Imp. Fisheries Bureau, Tokyo. 

 (Mit 1 Figur.) 



eingeg. 11. December 1898. 



While I was travelling in the United States of America, last winter, 

 I had a chance to visit the Leland Stanford Junior University at Palo 

 Alto, California. In the zoological laboratory of the university I found 

 some beautiful specimens of medusae, preserved in formaline. The 

 medusa which I am now going to describe was found among them. 

 There were three specimens of this medusa, one of which was allowed 

 to be taken with me by the kindness of Prof. C. H. Gilbert. 



The new medusa belongs to the genus Chrysaora^ so I propose to 

 name it Chrysaora Gilberti. The remarkable point in the structure of 

 this medusa is the screw-shaped oral arms. By this peculiarity it may 

 easily be distinguished from the other species of Chrysaora. The fol- 

 lowing description is based on the examination of the preserved spe- 

 cimens. 



The umbrella is slightly vaulted, about Vj^ — 3 times as broad as 

 high. 32 velar lobes are almost semicircular, with their free margin 

 entire, and all of them almost the same in height and breadth. The 

 thickness of the umbrella is about ^4 of the radial length. The um- 

 brella is rather suddenly thin at the margin, so that the marginal 

 lobes are bent downwards as is shown in the figure. The exumbrella 

 is covered all over the surface with many nesselwarts. 



