General History of the Marine Polyzoa. 201 



The marginal cells in an early stage have the front wall 



wholly membranous, with the oral valve at the top of it. A 



thin calcareous covering gradually forms over the membrane, 



the calcification, which is feeble, being interrupted by frequent 

 lacunae. 



Lepralia rectilineata, n. sp. (PI. VII. fig. 5.) 



Zocecia large, elongate, rectangular, disposed in regular 

 linear series, moderately convex ; surface whitish and silvery, 

 punctured, the punctures disposed in lines which run from 

 the sides towards the centre, sometimes separated by stony 

 ridges ; orifice large, expanded and suborbicular above, con- 

 stricted a short distance above the lower margin by two pro- 

 , minent points, below the constriction much contracted, lower 



margin nearly straight, slightly raised in the centre ; peri- 

 stome scarcely elevated ; six (normally) marginal spines, dis- 

 [ posed three on each side above ; the opercular plate filling in 



| the lower part of the orifice (beneath the constriction) much 



i thickened and prominent ; sometimes a small raised avicu- 



\ larium a little below the inferior margin, with somewhat 



elongate and rounded mandible directed downwards, often 

 several similar avicularia scattered over the front wall ; on 



each side of the orifice at the top a small avicularium of the 

 same kind, the mandible directed towards the side, sometimes 

 replaced by a much elongated form (PL VII. fig. 5 a) with a 

 slender subspatulate mandible. Ocecium (?). 

 Log. New Zealand {Miss Jelly). 



MUCRONELLA, Hincks. 



Mucronella bicuspis, n. sp. (PL VII. fig. 2.) 



Zocecia ovate, quincuncial, very prominent, the wall sloping 

 steeply up from the sides to the suboral region, sutures deep, 

 surface smooth ; orifice very large, subquadrangular, with a 

 slightly raised thin margin, bearing on each side just above 

 the lower margin an oval avicularium y with rounded mandible 

 directed upward, a denticle projecting inward on each side 

 just under the avicularium, and in the centre of the lower 

 margin a broad bicuspid process; immediately behind it rises 

 a tall sharply pointed mucro, the spreading base of which is 

 inclosed by a white line ; the lower portion of the cell usually 

 with a line of large punctures placed a little within the mar- 

 gin, areolated, the punctures sometimes irregularly scattered. 

 Ocecium of a beautiful pearly white, almost semicircular, 

 somewhat flattened in front, thickly covered with minute 



Ann. & Mag. N. Hist. Ser. 5. Vol. xi. 14 



