92 POLYZOA. 



sometimes sending off a process to the opposite side of the aperture ; 

 a single spine on the inner side springing from the peduncle of the 

 operculum ; two marginal spines on the outer side of the aperture ; 

 ovicell large, arcuate ; vibracula ovoid, setse serrated. 



Lyall's Bay. England. South Africa. South America. Cumber- 

 land Island. 



20. C. lata, Busk, I.e., p. 39. Bi-multiserial ; marginal cells with 

 a single sub-apical spine ; central cells without marginal spines ; setae 

 serrated. 



Australia. 



Perhaps a variety of G. Jiookeri, Johnston, Srit. ZoopTi., p. 338. 

 (Busk.) 



FAMILY BICELLAEIID^. 



Polyzoarium continuous, erect, dichotomously divided into narrow 

 ligulate, bi- or multiserial branches ; no vibracula ; avicularia, when 

 present, pedunculate and articulated. 



BICELLARIA. 



Cells turbinate, distant ; aperture directed more or less upwards ; 

 several spines, marginal or dorsal. 

 Europe. Australia. 



21. B. tuba, Susie, I.e., p. 42. Aperture round, looking almost 

 directly upwards ; a digitiform hollow process below the outer border, 

 supporting two to four long incurved spines ; two or three other long 

 curved sub-marginal spines behind or above the aperture, none below 

 it in front ; a solitary spine on the back, a short way down the cell ; 

 avicularia very long, trumpet-shaped, arising from the back of the 

 cell. 



Lyall'a Bay. Bass's Strait, 45 fathoms. 



HALOPHILA. 



Cells continuous, attenuated downwards, much expanded upwards, 

 with a large plain aperture ; unarmed. 

 Bass's Straits. 



22. H. johnstOniaD, Gray, I.e., ii., p. 292. Cells obliquely 

 truncated above, Avith a short spine on the outer angle ; aperture large 

 oval ; margin slightly thickened. Pale gray. 



Lyall's Bay. Bass's Straits. 



BUGULA. 



Cells elliptical (viewed behind), closely contiguous, bi-multiserial ; 

 aperture very large ; margin simple, not thickened ; avicularia, when 

 present, pedunculate and articulated. 



Europe. Bio de Janeiro. Honduras. Bed Sea. Australia. Auck- 

 land Islands. South Africa. 



23. B. neritina, Linnceus ; Busk, I.e., p. 44. Cells quadrangular, 

 lengthened, with a truncated summit, the angles projecting. 



