262 ZOOPHYTOLOGY. 
2. Fam. Mrmpraniponip&, Busk. 
2. Gen. Membranipora, Blainville. 
1. M. antiqua, n. sp., Busk. Pl. XX, figs. 1, 2. 
Area of cell pyriform, irregular, arched above, and either pointed or 
truncate below. Aperture sub-trifoliate, or somewhat contracted on the 
sides below the middle. Septa simple, not grooved. Numerous vibracular 
cells irregularly scattered throughout the polyzoary among the others, of an 
eusiform or falciform figure. 
Hab. Madeira, Johnson (on shell). 
A considerable number of fossil species of Membranipora, 
ard several of Hschara, are characterised by the presence in 
various points of the polyzoary of cells differmg in form and 
size from the common polypide-cells. From analogy with 
similar cells in several species of Lunulites, which are known 
to be vibracular organs, there is little or no doubt that the 
cells in question in the Membranipore and Eschare are of 
the same kind. And this supposition is further confirmed 
bythe circumstance, that in MW. stenostoma, Busk (‘ B. M. Cat.,’ 
p- 60, pl. c, fig. 1), avicularian cells are present, similarly 
disposed with relation to the polypide-cells. 
This peculiar character in the present species, by which it 
is distinguished from all other recent Membranipore with 
which I am acquainted, with the single exception above no- 
ticed, renders it a form of particular interest, when compared 
with many fossil species, occurring as it would seem in the 
Cretaceous formation. Instances of these will be found in 
the ‘Paléontologie Frangaise’ of M. D’Orbigny, and more 
especially in the forms described and figured as— 
Cellepora Xiphia, p\.dcexiii, figs. 3, 4. 
ee Xanthe, ib., figs. 5—7. 
A Michaudiana, pl. decxii, figs. 3, 4. 
= Xelimia, ib., figs. 15, 16. 
3 Parisiensis, ib., figs. 13, 14. 
Semieschara simplex, pl. decix, figs. 1—4. 
55 excavata, dccx, figs. 6—9. 
As well as in Hagenow’s ‘ Bryozoen der Maastrichter 
Kreidebildung,’ in the forms denominated— 
Cellepora Koninckiana, pl. xi, fig. 10, 
, depressa, ib., fig. 13, 
3 camerata, ib., fig. 9, 
and others. 
3. Gen. Lepralia, Johnston. 
1. L. sceletos,n. sp. Busk. Pl. XX, fig. 3. 
Outline of cell oval; anterior wall constituted of rib-like spines, six or 
seven on each side, which meet and interdigitate on the median line. An 
