i;i)\v.\i;h T. i;i;(>\VNK. 



Ptyclioyenu autarct ica , Browne . 

 Mitrocomidse. Revision of thk Genera. 



Tiai'i'p.sis, Mitrocomella, Mitroconm 

 Cosmetirella simplex, g.n. ct sp.n. 

 Cosmetira frigida, sp.n. .... 

 Patitachogon scoiti, sp.ii. .... 

 Solmundella mediterranea (Miiller) 



II. SCYPHOMEDUS.*: : 



Lucernaria vanhoeffeni, sp.n. 

 Periphylla. Note on the Species 

 Periphylla dodecabostrycha (Brandt) 

 Atolla iryvillii, Haeckel . 

 Desmonema. Note on the Species 

 Desmonema chierchianum, Vanhoffen 

 Desmonema gaudichaudi (Maas) 

 Rennie's Antarctic Siphonophores 

 Diplulmaris antarctica (Maas) . 

 Diphdmaris gigantea, sp.n. 



List of Books and Memoirs quoted in the Text 

 Description of Plates .... 



Cosmetirella, Cosmetira, 



29 



32 

 34 

 35 

 3G 

 38 



40 

 42 

 42 

 47 

 48 

 49 

 49 

 51 

 52 

 5G 



58 

 60 



Introduction. 



The collections of Medusae brouglit home by the ' Discovery ' and ' Southern Cross ' are 

 combined in this report. There was nothing whatever to be gained liy keeping the 

 collections separate, as they were made in localities not far apart, within two years of 

 each other, and both belong to the British Museum. ]\Iany of the .species are common 

 to both collections, and as the collections contained a high percentage of specimens in 

 very bad condition, it was a distinct advantage to be able to use the best specimens 

 and to pass over the bad ones. Some of the specimens were in such bad condition that 

 without a good clue it would have been impossil)le to determine the genus. 



With such soft-bodied animals as jelly-fishes so much depends, for a good 

 description and figure, upon the comlition of the specimens. There is a difference 

 between a description or drawing of a living !Medus)i in perfect condition and one based 

 upon a contracted and damaged specimen. When dealing with the latter kind one has 

 to use a certain amount of imagination, and to make allowances for defects. Although 

 some of the figures may not be altsoiutcly accurate in outline, still I have striven to 

 make dear the characters of the .species. 



