BRETTIA. 27 



HUXLEYA FRAGILIS, Dyster. 



Plata II. fig. 1. 

 HUXLEYA FRACIILIS, Dyster, Quart. Journ. Micr. Sc. Ti. 260, pi. xxi. figs 1, 2. 



/ourlum much branched, white and flexible, from half an 

 inch to one inch high. Zocecia pyriform, rounded 

 above, narrowed but usually not much produced below, 

 each cell rising from the top of the one beneath it ; 

 orifice placed on the front of the cell, just below the 

 top, very small, semicircular, with a straight lower 

 lip ; the margin unarmed and not thickened. Ooecia 

 unknown. 



Polypide with 10 tentacles. 



LOCALITY. Tenby (Dyster). 



The differences between this species and Scruparia clavata 

 have already been pointed out. In this genus the oral valve 

 is no longer placed at the top of a membranous area of 

 greater or smaller size, but occupies the whole of the ori- 

 fice and is immediately enclosed by the wall of the cell. 

 The orifice is a simple semicircular opening, and seems not 

 to be placed obliquely. The zooecia in this species are 

 not much attenuated and produced below, but are some- 

 what short and stout, and consequently present a much less 

 elegant appearance than those ofEucratea and Scruparia. 



Genus BRETTIA, Dyster. 



Per. Named after Mrs. Brett. 

 BRETTIA, Dytter, Quart. Journ. Micr. Sc. ri. (1858). 



GENERIC CHARACTER. ZOARIUM erect, corneous, branch- 

 ed, branches given off from the top of a cell a little to one 

 side, and facing in the same direction as the cell. ZOOJCIA 

 uniserial, elongate, subtubular ; n/n-r/nr< ti-rminal or sub- 



