434 POLYPI. VAGINATI. 



* Polypiferous pores always apparent. 



M. complanata, Lam. Compressed, broad ; lobes erect, plane, pli- 

 cated, and the apex divided ; pores scattered, obsolete. One of 

 the largest of the genus. Inhabits American seas. Lam. ii. 201. 



M. alcicornis, Lin. In loose subramose tufts with foliated pal- 

 mations j laciniae acute ; pores scattered, very small. Inhabits 

 West Indian seas. Lam. ii.201. 



M. truncata, Lin. Branching, dichotomous, in loose tufts ; branches 

 smooth, truncated ; pores operculated. 3 to 5 inches high. In- 

 habits Mediterranean sea. Lam. ii. 202. 



** Polypiferous pores slightly or not apparent. 



M. informis, Lam. Irregular, glomerated, solid ; ramuli thick, 

 short, obtuse, subnodose. Ellis, Cor. pi. 27, fig. C. 



M. calcarea, Lam. Loosely branched, polychotomous, solid ; bran- 

 ches slender, coalescing below ; apex obtuse. Inhabits European 

 seas. Ellis, Zoqph. pi. 23, fig. 13. 



Gen. 35. DISTICHOPORA, Lam. Millepom, Pall. 



Stony, solid, fixed, branching, slightly compressed ; pores un- 

 equal, marginal, disposed on the opposite sides in a longitu- 

 dinal series, and in the form of sutures ; stelliform warts on the 

 surface of the branches. 



D. violacea, Lam. Branched ; ramuli ascending, flexuose, smooth 

 and compressed. Inhabits Indian seas. Ellis, Zooph. 140. 



Gen. 36. ORBULITES, Lam. 



Stony, free, orbicular, flat or slightly concave, porous on both 

 sides or on the margin, and resembling a nummulite ; pores 

 very small, regularly disposed, approximated, sometimes scarce- 

 ly apparent. 



O. marginalis, Lam. Flat on both sides, the margin porose. In- 

 habits European seas on Corallines, Fuci, &c. Lam. ii. 196. 

 The other species of this genus are fossil. 



Gen. 37. LUNULITES, Lam. 



Stony, free, orbicular, flattened, convex on one side, concave on 

 the other ; convex surface with radiated striae and pores be- 

 tween them ; wrinkles or diverging furrows on the concave 

 surface. 



The species of this genus are only known in the fossil state. 



Gen. 38. OVULITES, Lam. 



Stony, free, ovuliform or cylindrical, hollow interiorly, often 

 pierced at both ends ; pores very small, regularly disposed on 

 the surface. 



Known only in the fossil state. 



