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ZOOPHYTOLOGY. 



The species of Pol_yzoa here described, and most of which 

 appear to be new, occurred on shells from Mazatlan, on the 

 Gulf of California; and for the opportunity of examining 

 them, 1 have been indebted to the kindness of Mr. Phillip 

 Carpenter, who has prepared a descriptive catalogue of the 

 " Mazatlan Mollusca," for the British Museum. The typical 

 specimens of the forms here noticed, will be found in that 

 Institution. 



Order. Polyzoa infundibulata. 

 Sub-order I. Cheilostomata. 

 Fam. Membranipoeid^. 



Gen. 1. Memhranipwa, Blainv, 



1. M. denticulata (n. sp.), Busk. PI. VII.. figs. 1 and 2. 



Area of cells rliomboidal ; internal margin of the aperture denticulate ; 

 cells separated by a narrow raised line. 



Hab. Mazatlan : on the shells of Imperaior ollvacens, I. vnguis, and 

 Anomia. 



The outline of the cells is usually distinctly defined by a 

 narrow blown line. One or two rounded or triangular emi- 

 nences (probably ovicells) are visible on many of the cells in 

 front and below. The form bears considerable resemblance 

 to M, Savartii, (Savigny, Egypt, pi. 10 ; M. Lacroi.vn, 

 Savigny, 13. M. Cat., p. 60, Plate 104, fig. 1,) but differs from 

 it in several important respects ; among which may be noticed 

 a 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 internal aperture is 

 furnished. 



2. 3L gothica, n. sp., Eylands, MS. PL VII., fig. 5, 6, 7. 



Area of cells elongated, oval ; margin thin and smooth ; mouth raised, 

 suborbicular, with an ovide notch inferiorly ; the anterior, calcareous, 

 depressed surface of the cells punctated, and perforated on eacli side by a 

 wide aperture ; large, immersed avicularia scattered irregularly over the 

 polyzoary. 



Hab. Mazatlan : on Tmperator olimceus and iingids. 



There is occasionally a short blunt spine or process on 

 each side of the mouth, a character which is also presented in 

 31. Rozieri, Savig. (B. xM. Cat., p. 59, Plate 65, fig. 6) a 

 species to which the present exhibits, in other respects, con- 

 siderable resemblance, and especially in the existence of the 

 large opening on each side of the front of the cells immedi- 

 ately below the mouth. The differences between the two, 

 however, are sufficiently striking. In M. Rozieri the ovicell 



