CXXXV111 



INTRODUCTION. 



MICROPORA, Gray. 

 STEGANOPORELLA, Smitt. 



Family IX. Microporidse. 



SETOSELLA, Hincks. 



Family X. Cribrilinidse. 



CRIBRILINA, Gray. 



MEMBRANIPORELLA, 



Smitt (part). 



Family XI. Microporellidae. 



CHORIZOPORA, Hincks. 



MICROPORELLA, Hincks. 

 DIPORULA, Hincks. 



Family XII. Porinidae, D'Orbigny (part). 



PORINA, D'Orbigny. 

 ANARTHROPORA, Smitt 

 (part). 



LAGENIPORA, Hincks. 

 CELLEPORELLA, Gray. 



SCHIZOPORELLA, 



Hincks *. 

 MASTIGOPHORA, Hincks. 



Family XIII. Myriozoidffl. 



RnYNCHOPORAf, Hincks. 

 SCHIZOTHECA, Hincks. 

 HIPPOTHOA, Lamouroux. 



Family XIV. Escharidae. 



LEPRALIA, Johnston 



(part). 



UMBONULA, Hincks J. 

 PORELLA, Gray. 

 ESCHAROIDES, Smitt. 



SMITTIA, Hincks. 

 PHYLACTELLA, Hincks. 



MUCRONELLA, Hincks. 



PALMICELLARIA, Alder. 

 RETEPORA, Imperato. 



* Schizoporella hyalina. Barrois notes a peculiarity in the gemmation 

 of this species. The buds originate laterally, instead of at the summit of a 

 cell; and the zocecia may therefore be described as intercalary in their 

 arrangement. (See Plate XLV. fig. 3.) There are also distinctive points 

 in the larva. Microporella impressa, it seems, agrees with it in these 

 respects ; and Barrois would unite these species in a distinct genus a course 

 to which I cannot assent, as the differences between the adult forms seem to 

 me much weightier and more significant than the alleged points of agree- 

 ment. 



t This genus is wrongly placed amongst the Escharida in the body of the 

 work (p. 385). 



J In the descriptive portion of the text this genus stands as Umbonella 

 (p. 316) ; but since it was in type I haw ascertained that a group of 



