MEDUS.T-:. 37 



position of the fjouads upon the radial canals is slightly varialdc. Some specimens 

 have the gonads extending over the proximal half of the canals, and others over the 

 central third portion of the canals. There is always a space between the stomach and 

 the gonads, so that the species cannot he placed in the genus Isonemi of Maas, which 

 has the gonads adjacent to the stomach. 



( )ne specimen still retains most of its tentacles, but the other specimens have, as 

 usual, lost their tentacles, and only the stumps remain. The tentacles are long and 

 thread-like, and have more the appearance of long cirri. They arc too macerated for 

 a <letailed description of their structure. Sense organs were searched for, but not 

 found. 



NARCOMEDUSiE. 



Family -EGINID^ (Gegenbaur, 1856), Maas, l'J04. 



SoLMUNDELLA (Hacckel, 1879), Maas, 1904. 



Generic Character. — ^^ginidse with two tentacles, and with a stomach having 

 eight pouches. 



Prof. Vanhotten (1908), in his revision of the Narcomedu.sa3, recognises only one 

 species for the genus, namely, Solmundella hitentaculata (Quoy et Gaimard), 1833. 

 Under that name all the Solmundellse taken by the ' \'aldivia ' on her long cruise 

 (1898-1899) in the North Atlantic, South Atlanti.-. Antarctic, and Indian Oceans have 

 been placed. 



Prof. Maas, on the other hand, recognises two species, .S'. hltentdculata and N. 

 mediterranea (J oh. Miiller), 1851. The latter species Maas (190G) has also recorded 

 from the Antarctic, where it was taken by the ' Belgica.' 



The differences between the two species, according to Maas, are the shape of the 

 umbrella, colour, and the numVjcr of sense organs. S. hitentaculata has a rather high 

 conical umltrella, with its apex above the exit of the tentacles, and the fully grown 

 a<Iult has sixteen to thirty-two sen.se organs. S. mediterranea has a rather Hat-topped 

 umbrella, not usually extending above the level of the exit of the tentacles, and the 

 sense organs do not exceed eight in number. 



Dr. Bigelow (1909) points out that the number of sense organs would lie the Ijest 

 character to select for the distinction of the two species. ,S. hitentaculata, however, 

 pa.s.Hes through a stage with eight sense organs, and the number increases with age, so 

 that at an early stage it resembles S. mediferranra. 



I bcf^ame familiar with S. hitentaculata in Prof. Ilcrdman s collection of Medusa; 

 from Ceylon, and after a prolonged second examination of the Solmundellse in the 

 ' Discovery ' collection, I came to the conclusion that S. mediterranea is a distinct 

 species. About twenty of the largest adult .specimens in the ' Di.scovery ' collection 

 were specially cxamincfl for the numln-r (»f sen.se organs. I could not find more than 

 eight, and they are distinctly adradial. .S. hitentaculata of a similar size would have 



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