72 BRITISH PALAOZOIC FOSSILS. [Zoopuyta. 
lamellee twenty to twenty-six, strong, equal from the wall to the circular boundary of the inner area, where 
one half cease, the other half abruptly diminished in thickness faintly continued towards the centre, and 
irregularly united ; horizontal section, shewing all the above characters distinctly: vertical section, shewing 
the thin vertical walls, dividing one cell from another, and the thick solid walls defining the inner area; 
outer area with rows of very minute delicate vesicular plates; inner area, with nearly obsolete confused 
structure, resulting from the sections of the edges of the irregularly contorted vertical lamellie. 
There are in many places on the polished specimens, evidences of the corallum increasing by an exact 
bipartite division of a parent star; and when this is advanced so as nearly to form two stars of the average 
size, the fact may be detected by the pentagonal form of these younger stars, resulting from the straight 
line dividing the hexagonal old star; this occurs so frequently as to have suggested the name and species 
to Goldfuss, who however did not notice the reason of this pentagonal form, or that the normal shape 
of the old stars was irregularly hexagonal as in ordinary cases. 
Position and Locality —Common in the Devonian limestone of Newton Bushel and East Ogwell. 
Genus. ARACHNOPHYLLUM (Dana). See page 37. 
ARACHNOPHYLLUM HEnnant (Lonsd. Sp.) 
Syn. and Ref—Astrea Hennahi (Lonsd.) Geol. Trans. Vol. V. t. 58. f. 3; id. Phili. Pal. Foss. t. 6. f. 16a 
and A. intercellulosa id. id. t. 6. f. 17. 
Sp. Ch.—Corallum forming masses of undefined irregular stars, averaging four or five lines from centre 
to centre; depressed centre of the stars usually a line and half in diameter; radiating lamelle twenty-nine 
to forty, alternately longer and shorter, all very thick round the prominent edge of the depressed centre, 
within the margin of which half the lamellz cease abruptly, the other half becoming suddenly very thin, 
and uniting irregularly at the centre; all the lamell become thinner as they pass the circular boundary 
of the centre, and either join the rays of the adjoining stars in a slightly irregular manner by a thin 
zigzag line, sometimes slightly cellulose, or continue without interruption from one cell to another, in 
which case the long rays of one star become the short rays of the other; all the lamellz densely granu- 
lated and spinulose on their sides, occasionally uniting to form very delicate filamentary irregular connecting 
plates: vertical section, shewing the edges of several of the vertical radiating lamelle, clothed with fila- 
mentary vesicular plates on their sides. 
Prof. Phillips has given the name Astrwa intercellulosa to those specimens in which the rays of 
adjoining stars did not exactly meet, but were united by zigzag irregular junctions, and occasional small 
cells; I have, however, observed both modifications in the same specimen, and I| think there can be no 
doubt of the identity of these species, concerning the propriety of the separation of which Prof. Phillips has 
expressed his own great doubts. M. d’Orbigny, in his Prodrome, has separated this species into four genera : 
Actinocyathus Hennahi for Phillips’s f. 16a; Phillipsastrea Hennahi for the same author's f.166; Favastrea 
intercellulosa for his f.17; and Lithostrotion Hennahi for Lonsdale’s figure in the Geological Transactions : 
there is, however, no structural difference between any of these, the slight difference of appearance being 
due to the amount of weathering, or the accident of whether the upper or lower ends of the coral were 
exposed—in the latter case the central pit of each star shewing as a prominent boss. The lateral disk- 
buds may very frequently be observed in this species. 
Position and Locality —Not uncommon in the Devonian limestone of Barton; limestone of Teignmouth. 
Genus. STREPHODES (J/°Coy). See page 29. 
SrrEPHODES GRACILIS (M°Coy). Not figured. 
Ref.—M°Coy, Ann. Nat. Hist. 2nd Series, Vol. VI. p. 378. 
Sp. Ch.—Corallum simple, very gradually tapering, irregularly twisted, averaging three inches long, and 
eight lines in adult diameter; horizontal section, outer wall very thick, solid; radiating lamellae at the 
above diameter, about fifty-six, very thin, extending in a slightly irregular manner towards a large central 
