Rev. T. Hincks o?i British Polyzoa. 527 



it also embraces a miscellaneous assemblage of forms, it seems 

 better to employ a new name. 



5. Mastigophora, nov. gen. 



(Lepralia, part, Johnston &c. 

 Hippothoa, part, Smitt.) 



Zoarium incrusting ; zooaecia with a semicircular o';ifice ; 

 the inferior margin straight, with a central sinus ; one or more 

 lateral vihracula. 



Type Lepralia Hyndmanni^ Johnston. 



6. SCHIZOPORELLA, nov. gen. 



(^Lepralia, part, Johnston &c. 

 Hippothoa, part, Smitt.) 



Zoarium incrusting ; zoooecia with a semicircular or sub- 

 orbicular orifice, the inferior margin with a central sinus ; 

 avicularia usually lateral, sometimes median, with an acute or 

 rounded mandible. 



Type Lepralia unicornis^ Johnston. 



7. Lepralia, Johnston (part). 



(Lejjralia, Smitt.) 



Zoarium incrusting (or erect ?) ; zoooecia with a semi- 

 elliptical aperture, contracted on each side about the middle 

 or below it. 



Type Lepralia Pallasiana, Johnston. 



Smitt has retained Johnston's name for the section of the 

 old genus Lepralia with a more or less horseshoe-shaped 

 aperture ; and it is clearly right that his decision should be 

 respected. The group seems to be a natural one. 



8. EscHARELLA, Smitt (part). 



(Lepralia, Johnston, part. 

 Enchara, part.) 



Zoarium incrusting, or rising into foliaceous expansions, 

 which are either simple or bilaminate ; zoocecia with a sub- 

 orbicular aperture, the lower margin slightly curved inward ; 

 the peristome raised and forming a secondary aperture, which 

 is channelled in front ; a median avicularium generally placed 

 immediately below the sinus. 



Type Lepralia reticulata^ Macgillivray. 



I retain Sraitt's nsime, provisionally for this large and well- 

 defined group ; but I have serious doubts whether the intro- 

 duction of a new name is not a less evil than the retention of 

 one which has been so variously applied. 



