96 



OF THE WORLD. 



This process of budding; is independent of the sexual reproduction. The terminal suckers ot the 

 tentacles are orange. Found on Ulva in the Bay of Naples. Described in detail by Hartlaub. 

 The structure of the reproductive sac is discussed in describing the character of the genus 



Eleutheria. 



Eleutheria vallentini Brown. 



Eleutheria vallentini, BROWNE, 1901, Annals and Mag. Nat. Hist., scr. 7, vol. 9, p. 279. 



Umbrella hemispherical, 3 mm. wide, 2 mm. high. 24 tentacles divided into two branches, 

 the upper branch with clusters of nematocysts, the lower with a terminal sucker. "An ocellus 

 on the extreme margin ot the umbrella opposite each tentacle." Stomach-tube conical and 

 small. Mouth a plain round opening without lips. The gonads occupy "the whole of the 

 upper part of the umbrella above the stomach." A single specimen was found by Vallentin at 



Fii;. 49. Eleutheria claparetlii, after Hartlaub, in Nordisches Plankton. 



Stanley Harbor, Falkland Islands, and described by Browne. Color ( ?) Number of radial- 

 canals ( ?) Brood-pouch ( ?) In the absence of a figure or a more detailed description it will 

 probably be impossible to redetermine this form unless it be rediscovered in Stanley Harbor. 



Genus MNESTRA Krohn, 1853. 

 Mnestra, KROHN, 1853, Archiv. fiir Naturges., Jahrg. 19, p. 278. GUNTHER, 1903, Mittheil. Zool. Sta. Neapel., Bd. 16, p. 35. 



The type species is Mnestra parasites Krohn, from the Mediterranean. 



GENERIC CHARACTERS. 



Cladonemidae with 4 radial-canals and a ring-canal. No brood-sac above the stomach. 

 4 to o degenerate, hollow tentacles with a row of netting capsules along their aboral sides. 

 \\ ith a ring of nettling cells around the margin and 4 linear tracts of nematocysts over the 



