510 ZOOPHYTA. LAMELLIFERiE. Cyclolites. 



Fungla turbinata, Flem. Wern. Mem. ii. 250. — Zetland. 

 This species occurred in the same boat in which I picked up the Caryophyl- 

 lea cyathxis. Though greatly defaced, it still exhibits proofs of its recent ori- 

 gin. It is inversely conical, pointed, subarcuated, with a concave disc and a 

 prominent centre ; the plates appear to have been equaL It is about five- 

 tenths of an inch in height, and nearly the same in breadth across the star. 



EXTINCT SPECIES. 



1. T. sMfcate.— Inversely conical, with twenty-four longitudinal striae, the 

 interstices striated by pairs of pores in each, disposed in numerous parallel 

 transverse rows.— Lamouroux Zoop. 51. t. Ixxiv. f. 18, 21. Geol. of Eng. 3. 

 London Clay. 



2. T. Konigi. — Inversely conical, aperture circular, divided into numerous 

 perpendicular lamellae, radiating from the axis to the circumference ; axis 

 simple ; margin crenulated ; external surface longitudinally striated ; striae 

 from 25 to 30, distinct, prominent, base convex.— ilfan^. GeoL Suss. 85. t. xix. 

 p. 22, 28 — Blue Chalk Marl. 



3. T. Fungites. — Inversely conical, lengthened ; more or less bent ; longi- 

 tudinally striated, with irregular transverse wrinkles ; star concave, with a 



large central axis. Fungites, C/re, Ruth. 327. t. xx. f. 6 In Carbo7iiferous 



Limestone, common ; frequently termed Ram's Horns. The specimens in my 

 possession differ greatly in their breadth compared with their length ; in one 

 the plates converge to the centre, without a solid axis ; and in another, there 

 are external drooping cylindrical processes from the sides near the small end. 



Gen. cyclolites. — Hemispherical ; star convex, -with 

 smooth slender lamellge ; the centre depressed ; below flat, 

 with concentric lines. 



1. C. elliptica.— Elliptical ; lamellae obsolete ; the central cavity length- 

 ened. — Lamarck, Hist. ii. 234. — Geol. Eng. 245. — Inferior Oolite. 



Gen. EXPLANARIA. — Stem irregular, foliaceous, waved, 



lobed, with the extremities covered with sessile, stellife- 



rous discs. 



1. 'E.flexuosa Stem compressed, proliferous, reticulated at the base, with 



transverse and longitudinal striae ; the superior stellated surface covered with 

 stars, closely set, and formed of raised undulating radii. — Madreporite, Park. 

 Org. Rem. ii. 49. t. vii. f. 11. — E. mesenterica, Geol. Eng. 245? — Infei-ior 

 Oolite. 



Gen. ASTREA. — Massive, the stelhferous discs rounded, and 

 imbedded in the nearly even surface. 



1. A. arac/iwoicte*.— Stelliferous discs close, smooth ; the plates proceeding 

 from the centre are waved across the margin, and are lost in the surrounding 

 matter. — Madrepora arach. Park. Org. Rem. ii. t. vi. f. 4 — Oolite. 



2. A. undiUata. — Stars continuous, the rays unequal, bifiircated and bend- 

 ing.— Madrepora und. Park. Org. Rem. ii. bG.— Bristol. 



