Z MAZATLAN BRYOZOA 



and below. This form bears considerable resemblance to Mern- 

 branipora Savartii (Savigny, Egypt, pi. 10; M. Lacroixii B. M. 

 Cat. p. 60, pi. 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. 



Hah. Mazatlan ; on the shells of Imperator olivaceus, Imp. 

 unguis and Anomia ; Liverpool Collection. 

 Tablet 1 contains a group on Imperator. 



- 2. MEMBEANIPOEA GOTHICA, Rylands, ms. (n. s.) 



Areis cellularum elongatis, ovalibus ; margine glabro, tenui ; 

 ore elevato, suborbiculari, inferne late sinuato ; cellularum 

 superficie anteriori calcarea depressd, punctata, orificio magno 

 utrinque perforato ; aviculariis magnis, immersis, irregulariter 

 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, pi. 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, Husk, &c., 

 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 

 I 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 JEsckares, p. 17, pi. 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. 



Hob Mazatlan : on Imperator olivaceus and unguis ; L'pool 

 Col. 



Tablet 2 contains a group on Imperator, 3, a group detached. 



