132 



CEYLON PEAEL OYSTER REPORT. 



will lead to the recognition of the species again, but should any doubt arise when 

 comparing a description or figure with living specimens, I would suggest that it 

 would be better to amend my work rather than describe another species. 



[After this report had been sent to the printer 1 received intimation from 

 Professor Otto Maas, of Munich, that he was preparing for publication his account of 

 the Hydromedusaj of the Dutch "Siboga" Expedition. As our respective reports 

 were likely to be published about the same time we agreed to exchange proofs. I 

 wish here to express my thanks to Professor Maas for his kindness in allowing me to 

 make use of his work, which must be regarded as a valuable contribution towards our 

 knowledge of the Hydromedusze. 



A few of the species in the Ceylon collection were also taken by the "Siboga" in 

 the East Indies, namely : Irenopsis hexanemalis, Octocanna polynema, Mesonema 

 'pensile, Liriope tetraphylla, and Solmundella bitentaculata.] 



The following is a classified list of the species described in this report : 



Dipurena sp. t 



Laodice indica, n. sp. 

 Mitrocomium assimile, n. sp. 

 Eutima curva, n. s]5. 

 Odorchis orientalis, n. sp. 

 Irene ceylonensis, n. sp. 



HYDROMEDUS.E. 



Anthomedus^. 



Cytceis herdmani, n. sp. 

 Proboscidactyla minima, n. sp. 



Leptomedus.e. 



Irene palkensis, n. sp. 

 Irenopsis hexanemalis, Goette. 

 Octocanna polynema (Haeckel). 

 yEquorea conica, n. sp. 

 ,, parva, n. sp. 

 Mesonema pensile (Modeer). 



Gmionemus homelli, n. sp. 



Trachomedus^e. 



Olindias sp. 1 

 Liikipe tetraphylla (Cham, et Eys.). 



Nakcumedus.e. 

 Sohmmdella bitcntacidata (Quoy et Gaim.). 



SlPHUNOPHUKA. 



Diphyes cliamissonis, Huxley. 

 ( 'iijuilila sp. 1 



Charybdea sp. 1 

 Nausithoe punctata, KdLL. 



Agalmopsis sp. 1 

 Physalia utriculus, Esch. 



Forpita sp. ? 



SCYPHOMEDUS^E. 



Pelagia sp. 1 



Crambessa sp. 1 



OTENOPHOKA. 



l'l< urubcarhw, ijlobosa, M.0J3ER, var. ccylonensis, n. Beroe Jleminyi (E.SCIi.). 



