410 Miscellaneous. 



copiously ramified, and bearing branches on the right and the left 

 of the trunk, althougli less f requenll}- on the latter side than in the case 

 of those described by Weismann. The coinosarc not only at the 

 base of the colony, but also close to the summit, is formed, or rather 

 issues, from two tubes described by Weismann, the outer one being 

 smooth and straight, while the inner one has undulating lines. The 

 zooids are club-shaped, with about twelve scattered tentacula, of which 

 some were rather longer than the rest. 



The medusoid buds proceed from a distinct pedicle, attached to 

 the stalk of the supporting hydrosoma. From their structure, as 

 Weismann observes, it is obvious that they become liberated and 

 able to float away. I kept my colonies for two or three days, living in 

 vessels in which the sea-water was constantly changed and kept in 

 motion, and I was thus able to obtain a certain number of medusa- 

 like zooids, which swam freely about like the medusie of a Bowjuhi- 

 viUia or a Fodocori/ue, and on comparing them with the medusoid 

 buds of Dendroclava it was evident that they were the ultimate 

 evolutionary forms of the latter. 



The detached medusie of Dendrochwa Boh mi i are somewhat 

 larger than those of Podocoryne carnea. They have a well-developed 

 umbrella with prolongations : the manubrium, or pedicle, is on the 

 other hand small, not reaching farther than the middle of the 

 umbrella, and is somewhat bottle-shaped with small ramifications at 

 its mouth. About halfway down a]>pear four yellow-green radiated 

 spots, " the gonophores," which have a smooth surface. There are 

 four radiated canals, which are flattened as in the family Tiaridce. At 

 the base of these there is a delicate longitudinal fibrillation. Of 

 the eight marginal tentacles four are radial in continuation with the 

 radial canals and fourareintermediate, the base of all being excessively 

 dense, while the lower side, as well as the distal extremity, bears 

 an orange-coloured spot (ocello). 



Weismann considers that this medusa should be placed in the 

 family TiaridcK (Haeckel), and in the subfamily of the Pand<xld<F, 

 while it may possibly be referred to the genus Pandaa (Lesson) or 

 to Conis (Brandt). A close examination of the adult zooids shows 

 that they have the characters of the TiaridiV * and of the subfamily 

 Pandrndu', but cannot be referred to the genus Conis, as they have 

 )io double crown of tentacles bearing ocelli on the shorter and 

 upper of those bodies. This form may possibly not admit of being 

 included in the genus Patidit-a ; at any rate 1 am unable to detect 

 those urticating threads (Nesselstreifen) of the umlirella which 

 distinguish the latter genus. 



The polypoid form lias been referred by ^^'eismanIl to the family 

 Clavidii'. If, however, we follow Alhuan + the fact of its having 

 gonophore medusoids would lead us rather to place it in the family 



* E. ILeckel, ' Das Svstem der Mediiseu.' Jena. 1879. 1 Tlieil. 1 

 Halft, p. 40. 



t A. F. AUmnn, ' A Monograph of tiyiunoblu^tic, or Tiibularian 

 Ilydroids/ 187i', Louden. 



