Zoopuyva.] LOWER PALZZOZOIC RADIATA. 23 
The Favosites ? favulosa (Phill.) Mem. Geol. Surv. Vol. II. is the only published species I know of this 
genus, which differs from /avosites in the clusters of enlarged tube-cells at subregular intervals, and from 
Stromatopora by the tubules being regularly prismatic, with diaphragms and connecting pores. 
NEBULIPORA EXPLANATA (M‘Coy). Pl. 1. C. fig. 6. 
Ref—M Coy, Ann. Nat. Hist. 2nd Series, Vol. VI. p. 288. 
Sp. Ch.—Corallum forming very thin, irregularly expanded, lamin, upward of two inches long, covered 
above with nearly regular, quincuncially arranged, flat or slightly depressed, nebular clusters of larger tubes, 
about one and half lines in diameter, and rather less than twice their diameter apart (about twelve or 
fourteen cells between one centre and the next); smaller intermediate tubes about six in one line. 
To the naked eye the whole of the tubular structure of this coral is manifestly coarser than in the 
N. lens, from which it differs in its large, irregular, foliaceous expansions of growth; it seems that 
the proportion (one hundred and fifty to an inch) of small cells in a given space was also greater in the 
F. (Nebulipora) favulosa (Phill. sp.), to which I should have otherwise referred it. 
Position and Locality—Coniston limestone, Coniston, Lancashire ; limestone of Applethwaite Common, 
Westmoreland. 
Explanation of Figures.—Plate 1. C. fig. 6. Portion of irregular foliaceous expansion, natural size, from 
Coniston.—Fig. 6. Portion of surface magnified four diameters, shewing the cluster of larger tubes, in- 
eluding a few small ones, and surrounded by the numerous, uniform, smaller tubuli. 
NEBULIPORA LENS (J/°Coy). PI. 1. C. fig. 7. 
Ref—MCoy, Ann. Nat. Hist. 2nd Series, Vol. VI. p. 283. 
Sp. Ch—Corallum forming lenticular masses, averaging ten lines in diameter, and one and half lines 
thick in the middle, gradually thinning to the edge; base slightly concave, with small concentric wrinkles ; 
upper surface evenly convex; clusters of large cells rounded, flat or slightly concave, about one line in 
diameter, and usually a little more than their diameter apart (averaging from sixteen to twenty cells be- 
tween one centre and another) : smaller tubes averaging eight in one line, larger tubes of the clusters 
averaging four or five in one line; two inter-diaphragmal spaces equal the diameter of the tubes; appa- 
rently two irregular, close rows of connecting pores on each face of each tube. 
When imperfectly developed or rubbed, it is difficult to recognise the imperfect star-like clusters of 
large tubes. The structure not being composed of concentric layers round a central nucleus, and the ap- 
pearance of the mouths of the tubes on the upper surface easily distinguish this fossil from the Stromatopora 
nummulitisimilis (Lonsd.). Owing to the minuteness and imperfect mode of preservation, it is difficult to 
be satisfied about the connecting pores, but from the appearance under a high power of several specimens, I 
have little doubt they are, as in the above notice. 
Position and Locality —In great abundance, clustered like Nwmmulites in some parts of the fine Caradoc 
sandstone of Horderly West; more rare in the schists of Moel Uchlas? Pont y Glyn, Diffwys, near 
Corwen. Cwm of the Cymmerig, Bala. 
Explanation of Figures.—Plate 1. C. fig. 7. Portion of mass, containing numerous lenticular specimens, 
natural size, from Caradoc sandstone of Horderly; the right-hand figure shewing upper surface with the 
imperfect star-like clusters of large tubes, at regular distances, surrounded by numerous uniform smaller 
tubes; the left-hand figure shews the central nucleus of base; the edge of the mass shews the form 
of the section, of two individuals—Fig. 7a. Portion, of surface magnified four diameters, shewing the 
nebular clusters of larger tubes amongst the smaller—Fig. 74. View of portion of vertical weathered 
section, magnified ten diameters, shewing the diaphragms of the tubes. 
