in d. Naturgesch. d. nied. Thiere währ. d. Jahre 1876—1879. 709 



expansions, which are either simple or bilaminate; zooecia with a 

 suborbicular 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 immedia- 

 tely below the sinus. Type Lepralia reticulata Macgillivr. 



Cylinäroporella n. gen. Zoarium adnate, incrusting; zooecia 

 having the front-wall composed of a single piece, not depressed ; 

 oral extremity produced, tubulär, with a terminal orifice, an ele- 

 vated pore on the front of the cell. Type Lepralia tubulosa Nor- 

 mann. 



Lagenipora n. gen. (s. oben.) Type L. socialis Ilincks. 



Schisotheca n. gen. Zoarium incrusting, zooecia with a 

 suborbicular (primary) aperture, the lower margin slightly sinuated; 

 secondary aperture raised, tubulär, notched or dentate in front ; 

 ooecium terminal, with a fissure in the front-surface ; avicularium 

 borne on distinct areas and distributed amongst the cells, sorae 

 times wanting. Type Lepralia fissa Busk. 



Bhynchopora n. gen. Zoarium incrusting; zooecia with a 

 suborbicular or subquadrangular aperture, the lower margin suppor- 

 ting an uncinate process; a large avicularium (in fully developed 

 specimens) placed trausversely below the aperture; ooecium terminal, 

 closed in front by a calcareous lamina. Type Lepralia bispinosa 

 Johnston. 



Anarthropora Smitt (part.). Zoarium incrusting ; zooecia free 

 and suberect above, aperture transversaly elongate, contracted, with 

 an entire and thickened peristome; an avicularium below and above 

 the aperture. Type Lepralia monodon Busk. 



Auch aus dem Gen. Membranipora Auct. scheidet Verf. einige 

 charakteristische Typen aus. So 



Micropora Gray. Zoarium incrusting; zooecia with promi- 

 nent raised margins; front depressed, wholly calcareous; oral 

 aperture semicircular, enclosed by a calcareous border. Brit. spec. 

 Membranipora coriacea Esper, Lepralia complanata Norman. 



S et OS eil a n. gen. Zoarium incrusting; zooecia with raised 

 margins ; front depressed and wholly" calcareous ; aperture semicir- 

 cular; vibracular cells alternating with the zooecia throughout the 

 colony; vibracula setiform. Type Membranipora vulnerata Busk. 



Megapora n. gen. Zoarium incrusting; zooecia with pro- 

 minent raised margins; front depressed, wholly calcareous; oral aper- 

 ture trifoliate; oral valve composed of two portions, a fixed traus- 

 versely elongate lamina and a movable lip. Type Lepralia rin- 

 gens Busk. 



