24 BRITISH PALAZOZOIC FOSSILS. [Zoopuyra, 
NEBULIPORA PAPILLATA (A/°Coy). Pl. 1. C. fig. 5. 
Ref —M°Coy, Ann. Nat. Hist. 2nd Series, Vol. VI. p. 284. 
Sp. Ch—Corallum forming very thin layers (usually coating Orthoceratites); clusters of large cells ele- 
vated into conical papille, about ten in each cluster; the papill a little wider than high, usually about 
twice their diameter apart, quincuncially arranged; thickness of corallum usually less than half a line, dia- 
meter of papillee about half a line, distance apart about one line; about nine or ten of the smaller cells 
occupy one line. 
Position and Locality.—Not very uncommon coating Orthoceratites in the upper Ludlow rock of Brig- 
steer, Kendal, Westmoreland ; and Coniston flags of Coniston, Lancashire; also at Firbank, Sedbergh, Kendal. 
Explanation of Figures.—Plate 1. C. fig. 5. Natural size coating an Orthoceratite from Coniston.— 
Fig. 5a. Portion of surface magnified six diameters. 
2nd Subfamily. CH/ETETIN ©. 
Corallum resembling that of the Favositine in general structure, but the walls imperforate; lamellie 
obsolete. This subfamily contains the Genera.—1l, Chetetes ; 2, Stenopora. 
Genus. STENOPORA (Lonsd.) 
Ref. and Syn.—Lonsd. Appendix to Darwin on Volcanic Islands and Strezelecki’s New S. Wales 
= Tubuliclida. onsd. 
Gen. Char.—Folypidom polymorphous, composed of round or polygonal tubes radiating from an imagi- 
nary axis to the surface, where the bounding ridges are tuberculated ; young tubes interpolated by lateral 
budding between the old; tubes constricted at irregular distances in planes parallel with the surface, and 
partially closed at the orifice by a concave diaphragm perforated in the centre; no connecting tubuli, nor 
foramina. 
In some species the tubes are polygonal throughout, in others they are polygonal in the middle where 
closely packed, and round near the surface where further apart. The interior of the tubes exhibits only 
imperfect diaphragms perforated in the middle. This genus differs from Chetetes by the constrictions of the 
tubes and the young ones being interpolated between the old (by lateral budding), so that a fracture 
exposes the outer walls. (In Chetetes the old tubes divide by fissiparous gemmation, and a rough fracture 
exposes the interior of the tubes.) 
STENOPORA FIBROSA (Gold. Sp.) 
Ref. and Syn.—Favosites fibrosa Gold. Pet. Germ, t. 28. f. 3. and 4, id. Sil. Syst. t. 15. dis f. 6. 
=F. Lycopodites Say and Hall. Pal. N. Y. t. 23. f. 1, 2, 3, and t. 24. f. 1. 
Sp. Ch.—Corallum polymorphous, usually forming cylindrical branches composed of polygonal tubes 
(usually six in the space of one line), slightly and irregularly flexuous, nearly straight in the middle, 
abruptly bending outwards to the surface near the sides, edges and sides smooth or marked in parts with 
strong, close, inequalities of growth forming tubercles on the angular edges, and wrinkles across the sides ; 
young interpolated tubes rapidly reaching their full diameter; substance of the tubes thick, the interior 
cylindrical, traversed by numerous diaphragms, at irregular distances, usually the width of the tubes apart, 
sometimes in places irregularly crowded: surface having a net-work of polygonal ridges with an inner concave 
space in which is the small round aperture (six in one line usually). 
Var. a. LycopopiTEs (Say.) 
Corallum hemispherical, growing from a flat, oval, concentrically wrinkled, membraneous base ; cells 
and characters of the tubes as in the above. 
