16 Rev. T. Hincks on the 



Microporella ciliata^ form Californica. (PI. XVII. fig. 3.) 



Lepralia californica, Busk, Quart. Journ, Micr, Sc. iv. (185G) p. 310, 

 pi. xi. fig. 6. 



This variety is abundant amongst the dredgings. The 

 oceciura is sometimes very prettily adorned with ribs radiating 

 from a central boss towards the base. 



Microjjorella Malusii, Audouin. 



Extremely abundant and very fine ; one of the commonest 

 species. 



MoNOPOEELLA, Hincks. 



Monojwrella brunnea, n. sp. (PI. XVIII. fig. 4.) 



Zooecia ovate or sometimes lozenge-shaped, quincuncial, 

 moderately convex, separated by fine lines, sutures well de- 

 fined ; surface glistening, minutely granulated, punctured and 

 reticulate, the punctures often more or less obliterated by 

 the calcification ; orifice arched above, lower margin straight 

 or slightly curved inward, peristome not raised ; the cell-wall 

 elevated below the mouth, so as to inclose a small cavity or 

 chamber, within which is placed a slightly raised circular 

 avicularium. Ooecium (?). Zoarium forming a light brownish 

 crust. 



In this species the surface glistens as if varnished. The 

 cells are well defined and simple in structure. In the older 

 zooecia the punctures disappear beneath tlie calcification, the 

 reticulations showing faintly through the stony crust. 



Family Myriozoidse (part.), Sraitt. 



SCHIZOPORELLA, Hincks. 



ScMzoporella auriculata^ Hassall, form ochracea, Hincks. 

 (Plate XVIII. fig. 5.) 



Off Cumshewa. [Britain, coast of Cornwall.] 

 I have not noticed the normal form of this species ; but the 

 variety which I have named ochracea, and which is charac- 

 terized by the presence of an immersed oval avicularium on 

 the front of the cell a short distance below the mouth, is not 

 uncommon. 



In the specimens from the Queen Charlotte Islands there 

 is almost always a small nodule immediately below the avicu- 

 larium, which is wanting in the British form. 



