T6 Mr. E. Kiikpatrick on the 



Stephanopora crihrt'spi'nata, n. sp. (PI. X. fig. 5.) 



Zoarium incrusting, loosely attached. Zooecia broad, ven- 

 tricose, smooth, hyaline, perforated by large, well-defined 

 pores ; margin of secondary orifice crowned by short spines. 

 Avicularia none. Ocecia ? 



Tlie specimen is placed in the family Microporellidffi, from 

 its possessing a mouth of the shape characteristic of the Mi- 

 croporellidffi, and from the absence of featm'es indicating an 

 afiinity with other groups. 



The genus is based on the following characters : — Secon- 

 dary cribriform roof, Microporellidan mouth, and absence of 

 special pore. 



Genus MiCKOPOEELLA. 

 Microporella ciliata^ Pallas. 



Family PorinidaB. 



Genus Anarthropoka. 



Anarthropora liorrida^ n. sp. (PI. VIII. fig. 2.) 



Zooecia broadly expanded and rounded below, tapering 

 upwards towards a tubular peristome ; surface verruco- 

 spinose (wart-like processes with short spines on the summit), 

 punctured ; primary orifice semicircular, with concave lower 

 border; secondary orifice varying from oval to circular; on 

 the front surface of the zcoecia (and occasionally apparently 

 between the cells) short tubular avicularia, lengthening out 

 above in the form of grooved spout-like processes. Ocecia ? 



Family Myriozoidse. 



Genus SCHIZOPORELLA. 



Schizoporella venusta, Norman. 



Lepralia venusta, Norman, Ann. N. H., Jan. 1864, p. 84, pi. x. figs, 2, 3. 

 GemeUipora glabra, forma sfriatvla, Smitt, Flor. Bry. pt. ii. p. 37, pi. xi 



fig. 207. 

 Schizopo reiki ve7iusta, IlincliS, Brit. Mar, Pol. p. 276, pi, xxx. figs, 6, 7. 



The Mauritius form possesses most of the characteristics of 

 the British one, but there is no umbo on the former. 



On the other hand the two forms resemble one another in 

 the shape of the orifice, the presence of modified and aborted 

 cells, &c. 



Schizojjorella ampla, n. sp. (PI. VII. fig. 4.) 

 Zoarium incrusting, Zooecia vcntriccse, somewhat irre- 



