158 
Rev. T. Ilincks on the 
Schizotheca, Hincks. 
The two species included in this genus [S. fissa, Busk, and 
8. divisa , Norman) have the primary orifice sinuated, but 
are distinguished by their raised tubular secondary orifice, 
notched in front, and (as a subordinate character) by the fis¬ 
sured ovicell. 
Hippothoa, Lamx. 
I retain this genus for the forms with distant, caudate cells, 
and a small aperture completely covered (or nearly so) by the 
opercular valve (i. e. destitute of any membranous area). H. 
catenularia auctt. belongs, as Smitt has already pointed out, 
to the genus Membranipora. 
Fam. 14. Escharidse. 
Genera: Lepkalia (part.), Johnston. 
This genus is adopted as limited by Smitt, and embraces 
forms with a more or less liorseshoe-shaped orifice, the lower 
margin of which is neither sinuated nor elevated into a mucro. 
I have ranged under it one or two species whose systematic 
position is somewhat doubtful, but which seem to agree with 
it more nearly than with any other group. One of these, 
Lepralia pertusa , Esper, has been much misunderstood; and 
very distinct forms have been referred to it by authors. I 
cannot agree with Smitt in ranging it alongside S'chizoporella 
sanguinea , Norman, as it has in no true sense a sinuated 
margin. The two lateral projections by which the orifice is 
constricted are placed very near the bottom of it; and just 
beneath them the lower lip curves slightly outwards, as it 
commonly does in the present genus; but there is no approach 
to a sinus. The general character of the cell, as well as the 
structure of the orifice, ally it to this genus. Another doubt¬ 
ful species, Lepralia polita , Norman, is placed here on the 
strength of its simple semielliptical orifice, with a slightly 
curved lower margin, which is without sinus, denticle, or 
mucro. 
Eschara foliacea auctt. of course finds its place beside 
Ijepralia Pallasiana , Moll. Whatever amount of doubt there 
may be as to associating definitely branched with crustaceous 
forms in the same genus, there can, I conceive, be none as to 
the propriety of uniting the latter with such kindred species 
as are erect and foliaceous , whether they be unilamellate 
(Hemeschara of authors) or bilamellate [Eschara). The three 
conditions are met with in the same species , according to age 
and other circumstances. In some cases the crustaceous habit 
