from the Falkland Inlands. '215 



the various stugos of development, and tliis neglect in cnrlier 

 days lias led to a number of s|)Uiioua genera and species 

 being made out of the early and intermediate stages. The 

 different stages of the same species iiaving been arranged in 

 several genera has caused great confusion and has [)laeed 

 classification on an insecure foundation. 



Mr. Vallentin is now at tiic Falklands making further 

 investigations on their marine faumi, and a second collection 

 of Medusae is likely to arrive during the coming summer. 

 For this reason I have prepared a preliminary Report on the 

 present collection, and will publish a complete Report when 

 the second collection has been examined. 



In this preliminary Report the coloration of the species 

 has been omitted. The specimens are in formalin or alcohol, 

 consequently the brightness and brilliancy of the colours are 

 destroyed. Mr. Vallentin has undertaken to note down the 

 colours of the MedusfB found on his present visit, so that the 

 true colours can be given in the next Report. 



ANTHOMEDUSiE. 



Codonidae. 



Saesia, Lesson (1843). 



Sarsia gracilis, sp. n. 



Umbrella cylindrical, nearly twice as high as broad, with 

 moderately thick walls and a quadrangular margin. 



Stomach a cylindrical tube, about two thirds of the length 

 of the umbrella-cavity. 



Gonads surround nearly the whole length of the stomach. 



I'entacles four, about the same length as the umbrella, ter- 

 minating with large knob containing nematocysts. 



C'cellus on the basal bulb of each tentacle. 



Size: up to 5 millim. in height and 3 millim. in width. 



About three dozen specimens in the collection, forming a 

 good series of stages extending from the earliest form up to 

 the adult. 



Amphicodon, Haeckel (1879). 



Codonidai with a single tentacle or a single group of two 

 or more tentacles, ])erradially situated, and three rudimentary 

 periadial basal bulbs without tentacles. Margin of the um- 

 brella not at right angles to the longitudinal axis of the 

 umbrella, but slopes towards the side carrying the tentacle oi 

 the group of tentacles. 



