NOTES ON THE NAIDIFORM OLIGOCHiRTA. 343 



Slavina, Vejdovsky. 

 Stylaria, Ehrenberg. 

 Pristina, Ehrenberg. 

 Naidium, O. Schmidt. 



I think it is desirable to add to this list Pterostylarides, 

 Czerniavsky, for P. parasita (syn. Stylaria parasita, 

 O. Schmidt) and P. raacrochsetaj sp. n., mihi ; Paranais, 

 Czerniavsky, for P. littoralis (syn. N. littoralis, O. F. 

 Miiller) and ? P. uncinata, and Chsetobranchus, for 



C. semperi, mihi. 



Genera and Species or Naidomorpha. 



Aulophorus, Schmarda. 



1. A. discocephalus, Schmarda; Kingston, Jamaica. 



2. A. oxycephalus, Schmarda; Galle, Ceylon. 



3. A. vagus, Leidy ; Philadelphia, N. America. 



Dero, Oken (see woodcut). 



1. D. latissima, Bousfield. 



2. D. Perrieri, Bousfield. 



3. D. obtusa, D'Udekem. 



4. D. limosa, Leidy. 



5. D. philippinensis. Semper, 



6. D. acuta, Bousfield. 



7. D. furcata, Oken (syn. D. palpigera, Grebnitzky ; 



D. rodriguezii. Semper). 



Nais, s. str., O. F. Miiller (see woodcut). 



Four cephalized segments in addition to the peristomial 

 segment remain well marked in the fully grown head. 

 There is no prostomial tentacle. 

 Some or all of the dorsal setae are capillary. 

 There are no branchial processes. 

 Eyes may be present or absent. 



VOL. XXXII, PART III. NEW SER. Z 



