lUinotH OUgoclucta. 443 



Uhizodrilns lacteus ii. g. et n. sp. Havana; abundant 

 loeall5^ 



E-mholoeejyhaliis inultisetosus n. sp, Havana; abundant 

 locally. 



Naidomorpha.'^ 



Nais laciistriH Linnseus. Urbana and Havana; abundant. 

 Nals eUnfinis 0. F. Miiller. Urbana and Havana ; abundant. 

 Nais lnrlda Timm. Havana ; frequent. 

 Nais serpentina 0. F. Miiller. Havana; frequent. 

 Dero limosaYiQy^ig. Havana; abundant. 

 Dero ohtusa D'Udekem. Havana ; abundant. 

 Dej'o vaga Leydig. Havana ; abundant. 

 DerofurcataOlien. Havana; frequent. 

 Pristina leidyi Smith. Havana; abundant. 

 Pristina Jiagelliim Leydig- Havana ; one specimen. 

 Chafogaster limnai v. Baer. Havana ; abundant. 

 Chcetogaster diaplianus Gruithuisen, Urbana and Havana ; 

 abundant. 



CJuetogastcr diastrophiis Gruithuisen. Havana; abundant. 



^Eoloso)nati(l(e. 



JEolosoma JtonjtricJtii Ehrenberg. Urbana and Havana; 

 frequent. 



jEolosonia tenebrarum.YejdoYsky. Havana; abundant. 

 A^olosoma sip. '^ Havana; abundant. 



DESCRIPTIONS OF TUBIFICID^. 



As the first two species of Tuhijicidce in our list are well- 

 known European forms which have been described at length 

 by previous writers, a brief recapitulation of some of their 

 more important characters will suffice in this connection. 



' Hut little attention has been given to the Naidomorp/i.a of Urbana. 

 '' A species with colorless integumental globules, not yet described. 



