from the Falkland Islands. 2815 



Size: up to 22 millim. in width and 10 inillim. in lieii^lit. 

 'I'licre are about sixty s|)cciniens in the collection, t'orniing 

 a good scries from an early stage up to the adult. 



TIUCHOMEDUS^. 



Petasidae. 

 Aglauuopsis^ Fritz Miiller (18o-5). 



Petasidai without centripetal canals, with numerous enclosed 

 mariiinal sense-orffans. Numerous tentacles, which are 



• 111 



evenly distributed round the margin of the umbrella, and not 

 arranged in grou[)S. 



Ajlauropsis Conantii\ sp. n. 



Umbrella bowl-shap.ed, with an inverted margin, a little 

 broader than high. 



Stomach somewhat cone-shaped, about half tlie length of 

 tlie umbrella-cavity. 



j\Iouth with four large perradial lips, having a folded 

 margin. 



Radial canals and ring-canal very broad. 



Gonads occupying nearly the whole length of the radial 

 canals, but separated by a short sp ice from the stomach and 

 also from the ring-canal ; transversely divided into lobes. 



Tentacles very numerous, ab )ut two hundred or more, 

 closely packed in two or three alternating rows round the 

 margin. 



ISense-organs internal, adjoining the ring-canal, about fifty 

 or more, each with a single otolith. 



Size: up to 18 millim. in height and 20 millim. in width. 



1'he collection contains about one hundred and fi;ty speci- 

 mens, showing a tine series ext"nding from the early stages 

 up to the fully-grown adult. 



'J'his species is dedicated to the memory of F. S. Conant, 

 of Johns Hopkins University, who died of yellow fever con- 

 tracted whilst engaged on the study of the Ciib)medus;o of 

 Jamaica, 18U7. 



Vallentixia, iien, nov. 



J to^ 



Petasidie with four simple radial canals, without blind 

 centri|»etal canals between them. Sixteen or more encloseil 

 marginal sense-organs. Fi>ur solid pena Hal tentacles with 

 suckers and twenty four or more liollow tentacles evenly 

 distributed on the margin having baiuls of nematocysts. 



