112 Descriptions of JS T evj, or Little Knovm, Polyzoa. 



with the mandibles pointed outwards and upwards. The 

 ovicell presents the usual arrangement, but is flatter. 



Var. longispma. — Cells broad, smooth, flat, and slightly 

 calcareous, grooved at the edges. The spines round the 

 mouth are veiy large and long, articulated and jointed; the 

 lower, on one or both sides, of enormous length, and divided 

 by two or three corneous joints. Suboral pore round, oval, 

 or semicircular: about the same width as in the normal 

 form. Avicularia large, opposite the pore, and pointing 

 downwards and outwards. 



Yar. lata. — Cells broad, flat, smooth, except some faint 

 grooving at the edges. Pore of moderate size, semilunar. 

 Usually an avicularium on one side only, although occa- 

 sionally on both ; generally situated above the level of the 

 pore, sometimes by the side of the mouth, the long slender 

 mandible directed mostly downwards, with a slight inclina- 

 tion outwards, but at other times directed more outwards. 



Var. canaliculate; . — I have had some doubt about this 

 form, but am satisfied, after an examination of specimens in 

 various stages, that it is merely a variety of M. diademcc, 

 the differences being caused by a large deposition of cal- 

 careous matter. The edges of the cells are deeply grooved, 

 the intervening walls, as well as the cell margin, very 

 calcareous. A mass of calcareous matter is heaped up in a 

 sort of semilunar ridge in the middle of the cell. The 

 suboral pore is of moderate size, round. There is a large 

 avicularium on one side, on the level of the pore, the 

 mandible directed straight outwards. In the ovicell the 

 beaded band has become smooth, and from its inner edge a 

 series of deep grooves, with calcareous intervening ridges, 

 radiate inwards to the centre, which is elevated into a cal- 

 careous mound. 



Family Myriozoim;. 

 Schizoporella cryptostoma, n. sp. Plate II., fig. 4. 

 Cells indistinct. Mouth arched above, straight below, 

 with a large sinus. 4 — 6 articulated spines on the margin, 

 the lower, on one or both sides, frequently larger. A large, 

 conical process arising from the centre of the lower margin 

 of the peristome, and almost entirely concealing the oral 

 sinus. Surface of cells tubercular and glistening. Ovicell 

 large, rounded, prominent, shining, surface smooth, or with 

 faint, converging lines. Avicularia of two kinds, either 



