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Family Hippopodinidae n. f. 



The somewhat thin-walled zocecia have no spines and are provided with scat- 

 tered pores. The primary aperture has a concave proximal margin and the slightly 

 chitinized operculum is surrounded by a more strongly chitinized marginal part. 

 Hinge-teeth and a peristome may be present or absent. Uniporous or multiporous 

 rosette-plates. An avicitlariiim may appear on the one or on both sides near the 

 aperture. The nwcia, which are endoocecial yet project distinctly on the surface 

 of the zooecia, consist of a membranous ectoocrcium and a calcareous endoooe- 

 cium provided with scattered pores. 



To this family belong the two genera Cheilopora and Hippopodina. 



Cheilopora n. g. 

 Lepralia Hincks, part.; Mucronella Hincks, part.; 

 Hippoporina Nev., part. 

 (PI. XXIV, fig. 4 a). 

 The distal wall has no expansion partly separating the oa'cium from the zooe- 

 cium ; multiporous rosette-plates; peristome present in the form of a lip-like pro- 

 jection. 



To this genus belong "Lepralia" sinccra Smitt, Hippoporina circuincincta Nev., 

 ^Mucronella<^ praelucida Hincks, M. praelonga Hincks and 'Lep.' Griinaldi Jul. 



Hippopodina n. g. 

 Lepralia part. 



The horizontal part of the distal wall is continued into an expansion which 

 forms a partial partition between the occcium and the zooecium; uniporous ro- 

 sette-plates; no peristome. 



Hippopodina feegeensis Busk. 

 Lepralia feegeensis Busk, Challenger, Zoology, Vol. X, 1884, Polyzoa, 



part I, p. 144, PI. XX, fig. 9. 

 Lepralia feegeensis Mac Gillivray, Proceed. R. Soc. Victoria (n. s.), 

 Vol. in, (1890) 1891, p. 81, PI. X, figs. 1—3. 

 (PI. XXIV, figs. 3 a-3 f). 



The zocecia, which have a very small depth (distance between frontal and 

 basal wall) are usually more or less regularly rectangular, fairly broad and thin- 



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