510 ZOOPHYTA. LAMELLIFER^E. Cyclolites. 



Fungia turbinata, Flem. Wern. Mem. ii. 250 Zetland. 



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

 lea cyathus. ^ 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. sulcata.— 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. lxxiv. f. 18, 21. Geol. of Eng. 3. 

 London Clay. 



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

 perpendicular lamella?, radiating from the axis to the circumference ; axis 

 simple ; margin crenulated ; external surface longitudinally striated ; striae 



from 25 to 30, distinct, prominent, base convex Mant. 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, lire, Ruth. 327. t. xx. f. 6. — In Carboniferous 

 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 lamella? ; the centre depressed ; below flat, 

 with concentric lines. 



1. C. elliptica.— Elliptical ; lamella? 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. IL.Jlexuosa — Stem compressed, proliferous, reticulated at the base, with 

 transverse and longitudinal stria? ; 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? — Inferior 

 Oolite. 



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

 9 imbedded in the nearly even surface. 



1. A. arachnoides — 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. t'. 4 Oolite* 



2. A. undulata. — Stars continuous, the rays unequal, bifurcated and bend- 

 ing. — Madrepora und. Park. Org. Rem. ii. 5C Bristol. 



