112 BRITISH PALHOZOIC FOSSILS. [Zoopuyra. 
(Systematic place uncertain.) 
Genus. HETEROPHYLLIA (d/°Coy). 
Ref—M‘Coy, Ann. Nat. Hist. 2nd Series, Vol. III. p. 126. 
Gen. Char.—Stem elongate, subcylindrical, irregularly fluted longitudinally; orizontal section, few 
distant lamelle, destitute of any order of arrangement, but irregularly branching and coalescing in their 
passage from the solid external walls towards some indefinite point near the centre, where the few main 
lamellee irregularly anastomose ; vertical section shewing about the middle an irregularly flexuous line (the 
edge of one or two of the radiating vertical lamelle), from which on each side a row of thin, distant, 
sigmoidally curved plates extends obliquely upwards and outwards, forming a row of large rhomboidal cells 
on each side. 
The paradoxical characters of the lamellie, their perfect want of symmetry of disposition, and their 
irregular branch-like union among themselves, together with the remarkable openness of the cellular struc- 
ture, render these corals totally unlike any other recent or fossil group. From Cladocora and Caryophyllia, 
to which they are most allied, they are distinguished by the want of the cellular axis, and by their few, 
unsymmetrical and anastomosing lamelle. I suspect the Cladocora? sulcata of Lonsdale may belong to 
this group, but I have not seen examples of it myself. 
HETEROPHYLLIA GRANDIS ((/°Coy). Pl. 3. A. fig. 1. 
Ref—M°Coy, Ann. Nat. Hist. 2nd Series, Vol. III. p. 126. 
Sp. Ch.—Stem slightly flexuous, about five lines in diameter, scarcely tapering in three inches, longi- 
tudinally marked with deep unequal grooves, and few, large, polygonal, unequal ridges, giving a very 
irregularly angulose section to the stem; swrface smooth, internal structure as given in the generic 
character. 
Position and Locality—Rare in the carboniferous limestone of Derbyshire. 
Explanation of Figures—PI. 3. A. fig. 1. Natural size from Derbyshire, shewing the irregular longi- 
tudinal costee—Fig. 1a. Do. Horizontal section magnified three diameters, shewing the irregular anasto- 
mosing of the lamelle. 
HETEROPHYLLIA ORNATA (A/’Coy). PI. 3. A. fig. 2. 
Ref—M°Coy, Ann. Nat. Hist. 2nd Series, Vol. III. p. 127. 
Sp. Ch.—Stems subcylindrical, long, flexuous, averaging one and half lines in diameter, with about 
sixteen narrow, subequal, longitudinal ridges sharply defined, and separated by flat spaces rather wider than 
the ridges they separate; the ridges are set with small round tubercles more than their own diameter apart ; 
surface very minutely granulose: internal structure as in generic character; horizontal section, lamelle about 
fourteen at the margin (one usually coinciding with each external ridge). 
Position and Locality—Rather rare in the carboniferous limestone of Derbyshire. 
Explanation of Figures.—P\. 3. A. fig. 2. Natural size from Derbyshire—Fig. 2a. Do. Magnified 
four diameters, shewing at top the horizontal section and irregular anastomosing of the lamelle, below 
this the external surface with the tuberculated costee; and at bottom the vertical section shewing the dis- 
tant, oblique, interstitial plates, the mesial line being formed by some of their edges. 
