Polyziia fruiii flic Gilbert Islands. 415 



Microporella falcifera, n. sp. (T'l. XXVII.. Fi- 11). 



Zi)ariuin encrusting. Zooecin immersed, oval, elongate, ven- 

 tricose ; surface rugose, with small pores and rounded depres- 

 sions, sometimes in linear series round the margins. A minute 

 pore with a raised border in the centre of the zooecium. Thy- 

 rostome arched above, straight below, with slightly raised mar- 

 gins ; an acute avicularium below proximal border, and one, or 

 more, on the surface of the zooecium, some of them very small, 

 with very acute mandibles. Large vicarious avicularia with long 

 curved mandibles and a large pore, always situated on the in- 

 curved side of the mandible, scattered about the zoarium. 



The chief peculiarity of this species is the very large vicarious 

 avicularium, with a long, acute, curved mandible and the pre- 

 sence of a large round pore in the surface of the cell. 



Schizoporella ensifera, u sp. (PI. XWir. Fig. 12). 



Zoarium encrusting. Zooecia irregularly orbicular or oval ; 

 surface uneven and crystalline in appearance. Thyrostome 

 rounded, with a shallow sinus in proximal margin ; three spines 

 on distal border ; two slightly curved ridges below, enclosing a 

 slightly depressed subtriangular area. In some of the zooecia 

 one of these ridges is replaced by a long falciform avicularium. 

 Ooecium orlticular. contracted proximally ; distal portion punc- 

 tate. 



A very small, delicate, glassy-looking species. Tlie zooecia 

 are ■<-ery irregularly grouped. 



Schizoporella perlata, a. sp. (PI. XXV IT., Kig. \:V). 



Zoarium encrustim;', robust. Zooecia elongated, oval ; surface 

 suiooth, with small annular dark markings. Thyrostome 

 orbicular with raised margins ; a very shallow sinus proximally ; 

 a small avicularium with a triangular mandible just below or to 

 one side. 



A very distinct species ; on one of the zooecia figured there is 

 an apparently imperfect aviculaiiuni just below the middle. 

 The surface is covered with small, annular, dark markings, with 



