122 
Mr. A. W. Waters on the 
than the oral aperture. The zoarium is attached to stones 
&c. by two to four radicular projections. 
One rosette-plate in the middle of the distal wall. 
Pliocene : Castrocaro, Castellarquato, Pisa. Pleistocene : 
Leghorn. Living: Britain, Orkney, Gibraltar, Adriatic 
(20-55 fathoms) ; and there is a specimen in the British 
Museum from Tsos-Sima. At Naples I received it from ap¬ 
parently about 40-50 fathoms. 
54. Membranipora Flemingii, Busk. (PI. XIII. fig. 2.) 
In the Naples specimens the rather large avicularia are by 
the side of the globular ovicells. The borders of the cells are 
usually rather closer together than shown in the figure. 
Lateral rosette-plates three, elongate, about equal distance 
from the base and the front wall. 
Loc. Pliocene : Castrocaro [M.) . Living: European seas, 
Australia? {Busk), Adriatic [Heller). At Naples, from just 
below low-water mark to 40 fathoms ; Boscoff (</.). 
55. Membranipora Flemingii , Busk, var. gr eg aria. 
(PI. XIII. fig. 5.) 
Membranipora gregaria , Heller, Die Biy. ties Adriat. Meeres, p. 98, 
pi. i. fig. 8. 
Membranipora aperta, Manzoni, Bri. del PI. di Castrocaro, p. 9, pi. i. 
fig. 4. 
The walls are much thinner and placed nearer together than 
is shown in my drawing. 
Membranipora Flemingii is a most variable species; and 
there does not, to my mind, seem sufficient reason for separa¬ 
ting this form, though, as the position of the large avicularium 
in front of each cell is characteristic, it may be considered a 
variety. Membranipora aperta, in 1 Crag Polyzoa,’ may be 
this variety, as well as the one figured by Manzoni. 
This only differs from Membranipora arctica, D’Orb. in 
Smitt, in the shape of the avicularian mandible. 
56. Membranipora angulosa, Bss. (PI. XIII. fig. 3.) 
For synonyms see Reuss, Die Foss. Bry. des Oest.-Ung. Mioc. p. 45, 
pi. x. figs. 13, 14. 
HMembranipora antiqua, Busk, Quart. Journ. Micr. Sci. vol. vi. p. 262, 
pi. xx. fig. 1. 
?Mollia antiqua, Smitt, Floridan Bryozoa, pt. ii. p. 12, pi. ii. fig. 73. 
Membranipora angulosa, Manzoni, Bid. di Castrocaro, p. 8, pi. i. fig. 11, 
and other papers. 
Eschara excavata, Reuss, Foss. Pol. W. B. p. 72, pi. viii. fig. 36. 
The surface of the cell is very minutely granulated. The 
shape of the area varies from oval to triangular. The raised 
