134 Rey. T. Hincks’s Contributions towards 
entirely destitute of spines, the radical appendage springing 
from about the centre. Owcium (?). 
Loc. Algiers, under stones (J. Y. Johnson). 
It is with considerable doubt that I rank this fine Diachoris 
as a form of Heller’s species. On comparing it with a speci- 
men of the latter from the Cape-Verd Islands many diffe- 
rences between the two are apparent. The cells of the 
present form are fully a third larger than those of the normal 
hirtissima, and are more erect; the spines with which they 
are furnished are much less numerous. In D. hirtissima the 
dorsal surface bristles with these appendages; behind the 
triplet at the top of the cell are placed a number of tall slen- 
der spines, which extend for some distance down the back. 
Others are scattered over the dorsal surface, and are frequently 
forked. In the present variety the back of the cell is entirely 
destitute of spines. ‘The spinules which bend over the aper- 
ture are usually more numerous in the normal form than in 
the variety ; and the spines generally are more delicate, and 
the whole habit less robust. The terminal triplet, from its 
size, is a really striking feature in the Algerian specimens. 
I have seen no avicularia on the normal D. hirtissima; in 
the variety robusta they are present, but not numerous. ‘They 
are peculiar in shape, and unlike the usual capitate forms, 
being almost globose and having a very short rudimentary 
beak. In this species the connecting-tubes are extremely 
short, and the cells consequently lie very closely together ; 
the dorsal surface presents an appearance very much re- 
sembling that which I have described in Membranipora 
radicifera (‘ Annals’ for July 1881). 
Family Myriozoide. 
SCHIZOPORELLA, Hincks. 
Schizoporella insignis, n. spe 
(Pl. V. fig. 10.) 
Zoecia ovate, distinct, quincuncially arranged; surface 
perfectly smooth, of a greyish colour; a raised line enclosing 
a large part of the front, and carried above the orifice ; within 
it arow of perforations, and immediately outside of it a row 
of small disks surrounded by a white line ; orifice large, peri- 
stome not raised, arched above, the lower margin slightly 
curved inward, with a central sinus, narrow at the opening 
and below subcircular, the cell-wall carried up immediately 
below the sinus into a prominent ridge-like umbo. Owcdwm (?). 
Loc. Africa (Miss Jelly). 
