252 Rev. T. Hincks's Contributions towards a 



neous, thickly covered with nodular risings, highly polished 

 and glistening, more or less punctured round the margin ; 

 orifice arched above, lower margin straight, with a rather deep 

 central sinus, rounded below and not contracted above ; peri- 

 stome extended and elevated in front, so as to form a semi- 

 circular wall immediately below the sinus stretching from 

 side to side; oral spines six or seven, the foremost on one 

 side (?or on both), antenniform, composed of pieces fitting 

 one into the other; frequently a raised circular avicularium 

 towards one side of the orifice, sometimes replaced by one 

 with an elongate pointed mandible, which stretches up along- 

 side the orifice. Ocecium rounded, imbedded towards the base 

 in the nodular crust, sloping steeply down from the summit 

 towards the orifice, and produced in front into a lobe (slightly 

 hollowed on the sides), which completely shields the entrance ; 

 surface smooth, glassy, delicately lineated. 



Zoarium white ; the crust piled up to a great thickness in 

 the older portions, so that the cell-boundaries disappear and 

 the orifices are deeply immersed. 



Log. New Zealand, on shell (Miss Jelly). 



Schizoporella lucida, n. sp. (PI. IX. fig. 5.) 



Zooecia ovate, depressed, bounded by raised lines ; surface 

 roughened and minutely punctured, silvery ; orifice much 

 broader than high (elongated transversely), arched above, 

 lower margin straight, with a small rounded sinus in the 

 centre ; peristome thin, elevated round the upper part of the 

 orifice ; on each side, a little below the inferior margin, a blunt 

 spinous process. Ocecium large, rounded above, very much 

 broader than high (almost reniform), the basal portion inves- 

 ted by a belt of dull whitish calcareous crust ; on the front 

 surface a semicircular space, smooth and silvery, with a line 

 of punctures round the border and a few scattered over the 

 area ; the orifice in the ovicelligerous zooecia walled in at the 

 sides by an extension of the peristome, and in front by two 

 calcareous plates or lobes, which bend inwards and unite 

 above, leaving a circular foramen below. Avicularia none. 



hoc. Australia, on weed (Miss Jelly). 



There is a great difference in appearance between the cells 

 which are furnished with the ocecium and those which are 

 not ; the former are eminently picturesque. The two solid 

 spinous processes below the orifice are scarcely apparent when 

 the ovicell is present, but they are a notable feature in the 

 younger cells. 



