274 Mr. E. T. Browne on Hydromcdusiai 



"JMie zoolooical interest in tlie eollection is not so niucli in 

 tlie nnniluM- of new species as in the o;cncra and their n[eo(Tia- 

 pliical distribution. There is a marvellous resemblance 

 between the medusoid fauna of Stanley Harbour and the 

 niediisoid fauna found in British seas. Out of the sixteen 

 Falkland genera no less than thirteen occur in our seas, and 

 to these genera most of our species (and some of our com- 

 monest species) belonjj-. 



The three Falkland genera which are not found in our 

 seas are two new g:enera [Tiaricodon and Vallentitn'a) and a 

 rediscovered genus (Agfauropsts) . The two new genera have 

 interesting characters connected with them. 



Tiaricodon shows a eonnecting-liidv between the families 

 Codonidje and Tiarida?. At its earliest stage it is just like a 

 little Sarsin (Codonidje), but the adult, a fine medusa, has 

 the characteristics of the Tiarida3. 



Vallentinia is a Trachomedusa with the four pcrradial 

 trntacles modified into suckers, and the other tentacles are of 

 the normal Trachomedusa type. This medusa was found 

 amongst the kelp, and its habits are ])robably somewhat 

 similar to those of Clodonevia (Anthomedusa-), which lives 

 amongst our Zos/e^-a-beds, 



AqJiniropsis has only recently developed a history. For- 

 meily only one species {Aglanropsis Aqassitii) was known, 

 and from the coast of Brazil. It was taken and described by 

 Fritz ]\Iiiller (1865), but the description is so incomplete that 

 only the generic characters are given. There are no figures 

 of the species and no further records. It is quite possible 

 that the Falkland Agliuropsis also occurs on the Brazilian 



coast, as it is a Trachomedusa and belongs to the oceanic 

 forms. 



Last autumn 1 received from my friend Dr. F. W. Gamble 



some jMedusa^ from BoscofF, on the French side of the English 



Chaimel, and amongst them were some fine specimens of an 



Aojlauropsis. It is another species, which I intend soon to 



describe and figure. 



'\ he rew genus Phiahlla mentioned in this Bcport is of no 



inijiortance ; it is only the result of a further splitting-up of 



the old genus Tlunirttantias. 



The large iiumber of specimens which Mr. Vallentin's 



collection contains has added considerably to our knowledge 



of the development and the life-history of some of the species. 



The develo|)m(nt of the Falkland species is similar to tiiat 



of their British allies. 



It is only of comjaratively recent date that attention has 



been gi^'en to the tracing of the life-Iiistory of Medusiii through 



