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446 Rev. T. Hineks on the 



The surface in the younger cells is thickly covered with 

 minute punctures, which are more or less obliterated as calci- 

 fication proceeds. A rounded avicularium is present on both 

 sides of the orifice, and the large mamillated form with 

 pointed mandible is also abundant. 



Schizoporella sinuosa^ Busk, 



Shallow water, on shell. 



[Scotland (west), and Shetland, Arctic seas, Gulf of St. 

 Lawrence.] 



Highly calcified, the ooecia being deeply immersed. 



ScMzoporella crassilabris^ n. sp. (PI. XVIII. fig. 1.) 



Zocecia large ? elongate, ovate, quincuncial, very distinct, 

 convex ; surface dense, punctured (the punctures often oblite- 

 rated by the calcification) ; orifice suberect, suborbicular, with 

 a broad, rounded, shallow sinus occupying nearly the whole 

 of the lower margin ; peristome raised and thickened, forming 

 a wall round the orifice, often massive in front, where it is 

 carried out into a broad projection, notched or sinuated in the 

 centre. Avicularia none. Ocecium large, rounded, broader 

 than high, with rather large punctures. 



Houston Stewart Channel, 15-20 fathoms, on small shells. 



Schizoporella crassirostrts, n. sp. (PL XVIII. fig. 3.) 



Zocecia ovate, quincuncially arranged, very convex, much 

 elevated (gibbous) towards the oral region ; surface dense, 

 traversed by raised lines or ribs, radiating towards the sides ; 

 immediately below the orifice a tall and massive rostrum 

 which occupies a large part of the front of the cell ; on the 

 inner side of it towards the base an avicularium placed trans- 

 versely, mandible pointed, beak .sharp and curved at the ex- 

 tremity ; below the rostrum a smooth area, extending to the 

 bottom of the cell, arched above, and marked off by a distinct 

 line ; orifice orbicular, with a shallow rounded sinus on the 

 lower margin, occupying about two thirds of its width, peri- 

 stome raised in the older cells ; frequently a pointed auicula- 

 riurn, placed on the margin of the orifice and attached to one 

 side of the rostrum. Ocecium (?). 



On stone, a single specimen. 



A very peculiar form, of which the striking feature is the 

 large rostrum, which appears all the larger from the elevation 

 of the cell-wall below the orifice. The defined area, with 

 smopth surface below the rostrum, is no doubt the site of the 

 ocecium, which was not developed in the specimen examined. 





