2 MAZATLAN BRYOZOA 
and below. ‘This form bears considerable resemblance to Mem- 
branipora Savartii (Saviqny, Egypt. pl. 10; M. Lacroixu B. ©. 
Cat. p. 60, pl. 104, fig. 1.): but differs from it in several impor- 
tant respects ; among which may be noticed the narrow brown 
line surrounding the cells and clearly: defining one from the 
other; and the irregularly shaped branching denticles with 
which the margin of the interior calcareous aperture is fur- 
nished. 
Hab—Mazatlan ; on the shells of Imperator olivaceus, Imp. 
unguis and Anomia; Lzverpool Collection. 
Tablet 1 centains a group on Imperator. 
2. Mempranipora Goruica, Rylands, ms. (n. s.) 
Areis cellularum elongatis, ovalibus; margine glabro, tenui ; 
ore elevato, suborbiculari, inferne late sinuato ; ceilularum 
superficie anteriort calcared depressd, punctatd, orificio magno 
utrinque perforato ; aviculariis magnis, immersis, trregulariter 
per polyzoarium sparsis. 
There is occasionally a short blunt spine or process on each 
side of the mouth, a character which also exists in M. Rozieri, 
Savigny, (B. M. Cat. p. 59, pl. 65, fig. 6,) a species to which the 
present exhibits in other respects considerable resemblance, 
and especially in the existence of the large opening on each side ~ 
of the front of the cell immediately below the mouth. The 
differences between the two, however, are sufficiently striking. 
In M. Rozieri the ovicell is large, superior, rounded, and carinate 
in front; whilst in M. gothica, as in M. calpensis, Bush, &e., 
this organ appears to be represented by one or two rounded 
eminences at the bottom of the cell in front. The large scat- 
tered avicularia also, are characteristic of the present form, as 
- well as its much larger size. 
The same species occurs on a pearl-oyster shell, for which 
T am indebted to Dr. J. E. Gray ; the habitat assigned to which 
is doubtfully given as the Persian Gulf. In M. M. Edwards’ 
Memoir Sur les E'schares, p. 17, pl. 12, fig. 13, a miocene fossil is 
described and figured, which bears considerable resemblance to 
the present ; it differs principally, so far as can be determined 
from the figure alone, in the thickened and granulated margin 
of the area. 
Hab.—Mazatlan: on Imperator olivaceus and unguis ; L’pool 
Col. 
Tablet 2 contains a group on Imperator.—3, a group detached. 
