18 Rev. T. Hincks on the 



Schizojyorella crassirostris, n. sp. (PL XVIII. fig. 3.) 



Zooecia ovate, qiiincuncially 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 avicula- 

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

 side of the rostrum. Ooecium (?). 



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 

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

 ooecium, which was not developed in the specimen examined. 



ScMzoporella longirostrata, n. sp. (PL XVII. fig. 4.) 



Zooecia large, ovate, disposed in lines, moderately convex 

 (sutures shallow) ; surface roughened or minutely granulated, 

 covered with an epitheca ; orifice arched above, lower margin 

 extended into a wide, rounded, and shallow sinus, which occu- 

 pies about three fourths of the width ; peristome thin, some- 

 times elevated at each side ; on one side of the cell, generally 

 a little below the orifice, an elongate pointed avicularium^ 

 the mandible (which is broad at the base and tapering above) 

 directed obliquely downwards, usually turned slightly out- 

 wards. Ooecium rounded, depressed in front, thickly punctured, 

 with a shallow oral arch. 



Off Cumshewa, on shell. 



A curious diversity in the shape of the orifice occurs in 

 this species. It is commonly as described in the diagnosis ; 

 but interspersed amongst the normal zooecia are others in 

 which the orifice is of a narrow elongate form, the sinus being 

 deep and pointed, and less distinctly marked off from the rest 

 of the oral opening than in the other case. The shape of the 

 mouth in these cells is very regularly obovate. When covered 

 with its epitheca this species is of a uniform light brown 

 colour, and the granulose sculpture is almost concealed. 



