ZOOPHYTOLOGY, 177 



is large, superior, rounded, and carinate in front, whilst in M. 

 gothica, as in M. calpensis. Busk. B. M. Cat, p. 60, Plate 104, 

 fig. 5, 6, this organ appears to be represented by one or two 

 rounded eminences at the bottom of the cell in front. The 

 large scattered avicularia also are characteristic of the present 

 form, as well as its far larger size. 



The same species occurs on a Pearl-oyster shell, for which 

 I am indebted to Dr. J. E. Gray, the habitat of which seems 

 to be doubtful. In M. Milne Edward's Memoir " Sur les 

 Eschares," p. 17, Plate 12, fig. 13, a miocene fossil is 

 described and figured, which bears some 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. 



3. M. , n. sp. ? PI. VII., fig. 3, 4. 



Apparently an undescribed form, but requiring further research for its 

 precise determination. 



Hab. As the preceding. 



Gen. 2. Lepralia, Johnston. 



1. L. marginipora, Eeuss. Fossil. Polyp, d. Wiener tertiar. Becken., 



p. 88. PL 10., fig. 23. Busk, 1. c, 

 p. 4. 

 Cells ovate, convex or slightly depressed, immersed, roughish, punctate 

 at the margin ; mouth round, or subelliptical ; margin thickened, with 

 an avicularium on each side. 



Hab. Mazatlan : on ImjKrator unguis ; Vienna tertiary basin (fossil) ? 



As the form appears precisely to resemble the tertiary 

 species described and figured by Reuss, I have applied his 

 name to it, and in great part employed his character. 



2. L. Jiumilis, n. sp. Busk, 1. c, p. 5. PI. VIII., fig. 1. 



Cells immersed, depressed, or flattened, surface obscurely punctate ; 

 mouth small, rounded, with a shallow sinus in the lower lip, maro-in 

 simple, thin. 



Hab. Mazatlan : on Imperato)' unguis. 



3. L. hippocrepis, n. sp. Busk, 1. c, p. 4, PI. VIII., fig, 2. 



Cells immersed, punctate ; mouth suborbicular or elliptical, its upper 

 margin in the older cells inconspicuous, inferiorly and laterally, thickened 

 with an avicularium on each side. 



Hab. Mazatlan : on Imperator olivaceus. 



The peculiar horse-shoe shaped mouth of the older cells, 

 with the avicularia on either side, sufficiently distinguishes 

 the present from L. marffinipora, to which, in the mouth of 

 the younger cells, it bears some resemblance, 



4. L. Mazatlanica, n. sp. Busk, 1. c, p. 3, PI. VIIL, fig. 4. 

 Cells immersed, depressed, or ventricose ; surface punctate ; mouth 



VOL. IV. N 



