218 NATURAL HISTOEY OP 



small, terminal. OviceUiguovs cells small and imper- 

 fectly developed. Ooecia terminal. — T. H. 



1. S. c LAV ATA, EincJcs. 



Hab. : Lamlash Bay, Arran, Filey Bay {Hincks) . 



ZocBcia uniserial, or biserial and dorsally aduate. 

 '' Each cell is attached to the dorsal surface of the one 

 next below it by a heart-shaped expansion of the 

 base.'^ 



This species, which is parasitic on other Polyzoas, 

 was discovered by Mr. Hincks^ and described by him 

 in the " Quarterly Journal of Microscopic Science/^ 

 vol. V. 175. Its mode of growth is liable to consider- 

 able variations, the zooecia being sometimes uniserial 

 and sometimes biserial. 



Genus IV. Huxleta, Dysfer. 

 Named in honour of Professor Huxley. 



Zoarium corneous or subcalcareous, dichotomously 

 branched, the branches given off from the top or side 

 of a cell, and facing in the same direction. Zooecia 

 uniserial. — T. H. 



H. ERAGiLis, Dysfer. 



Hab. : Tenby {Dyster). 



Discovered by Dyster, and described in the Q. J.M. S., 

 vi. 260. 



The zooecia are white and flexible, uniserial, and 

 extend to a height of I — 1 inch. Each cell rises from 

 the top of the one beneath it, and is elongated with a 

 rounded top, and a small semicircular aperture. The 

 margin has no spines. 



Genus V. Brettia, Dyster. 

 Named after Mrs. Brett. 

 Zoarium erect, corneous, branched. Branches given 



