48 



C. F. ROUSSELET ON A NEW FRESH-WATER POLYZOON 



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All these are considered 



to be synonyms or 

 varieties of PI. repens. 



Plumatella stricta. Allman (Belgium) y 

 diffusa. Leidy (America) 

 nitida. ,, 



arethnsa. Hyatt 

 aplini. Mac Gillivray 



(Australia) 

 hn-ifuga. Vaucher, Jullien 

 hyalina. Kafka (Bohemia) 

 pohjmorpha. Kraepelin 



(Germany, etc.) 

 [n'niceps. Kraepelin (Ger- 

 many, etc.) / 

 philippinensis. Kraepelin (Philippine Islands) 

 {Hyalinella) resicidaris. Leidy, 

 Jullien (America) 

 vitrea. Hyatt, Jullien 



(America) 

 lophopoida Kafka 

 (Bohemia) 

 PectinateUa magnified. Leidy (America, Germany). 

 gelatinosa. Oka (Japan). 



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These are con- 

 sidered synonyms 

 of Hancock's PI. 

 punctata. 



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Lophophore circular. 



Fredericella regina. Leidy (America) ^ These are considered 

 ,, walkottii. Hyatt „ [■ synonyms of 



,, pidcherrima. ,, ,, J F. sultana. 



Paludicella midleri. Kraepelin (Germany). 



,, (Pottsiella) erecta. Potts. Kraepelin (America). 

 Urnatella gracilis. Leidy (America) 

 Jlislopia lacustris. Carter (Central 



India) 

 Xorodonia cambodgiensis. Jullien 

 (Indo-China) 

 ,, sinensis. Jullien (Indo-China) 



These four species are 

 unlike the other fresh- 

 water Polyzoa, and 

 their affinities lie with 

 the marine species. 



As will be seen, the very variable genus Plumatella, having a 

 horny, chitinous, tubular, branching ectocyst has the greatest 

 number of species, but the claim to specific rank of nearly every 

 one of these has been denied by one or the other eminent student 

 of this group, who holds that they are synonyms, or at most 



