Potyzoa.] LOWER PALAZOZOIC RADIATA. 49 
GLAUCONOME DISTICHA (old.) 
Ref. and Syn.—Gold. Pet. Germ. t. 65. f. 15. Lonsd. Sil. Syst. t. 15. f. 12. (branches too irregular) 
= Penniretepora Lonsdalei D’Orb. Prod. p. 45. 
Sp. Ch.—Tripinnate, all the ramifications coming off at angles varying (in the same specimen) from 
50° to 60°, and varying (in short distances) from opposite to alternate ; primary branches slightly more 
than half a line wide, giving off three lateral branches in the space of two lines; secondary branches half a 
line wide, upwards of an inch and half long, giving off three lateral branches in the space of two lines; 
ternary branches upwards of half an inch long, about one-third of a line wide, giving off nearly four lateral 
branches in the space of two lines; all the branches slightly convex and marked with minute granulose 
longitudinal strize on one face, obtusely keeled on the other, with a row of large oblong, thick-edged pores 
on each side, about one-third longer than wide, occupying the width of the face, and their ends in contact, 
three pores in the space between each pair of lateral branches; a row of very small cell-pores on the 
medial keel. 
The figure of Goldfuss, above quoted, does not exactly agree in the distance of the ramuli with specimens 
I have seen labelled by himself, from Dudley, nor with any other I have seen; but as he quotes his species 
both from Dudley and the Eifel, I think, if even he has confounded two species, that it is to this well- 
known one we ought to retain the name, first, because the authentic specimens I have examined were 
from the former locality, and identical with the fossil before us; second, the second Devonian species, if 
such really exists, has not been separately recognised. 
Although the specimens in the schists seem more developed in size and number of the ramifications 
than the fragments usually seen in the Wenlock limestone, still the proportions, when taken by delicate 
instruments with every care, leave the impression on my mind that it is impossible to separate them spe- 
cifically. The small third row of cells on the keel can in general only be detected with difficulty by a 
good lens, and their apparent absence in ordinary cases is not to be depended on. 
Position and Locality——Very abundant and of luxuriant growth in the slates of Llansantfraid, Glyn 
Ceiriog, Denbighshire; Blain y Cwm, W. of Nantyre, Glyn Ceiriog; Llanfyllin, Montgomeryshire; Wenlock 
limestone, Dudley, Staffordshire. 
Genus. FENESTELLA (Miller, MSS. as given by Lonsdale.) 
> Fenestrellina VOrb.; > Reteporina VOrb. 
Gen. Char.—Polypidom calcareous, cellular, forming a conical or fan-shaped expansion, of radiating 
branches (interstices) connected by transverse dissepiments; exterior surface of branches rounded, covered 
by a dense minutely porous layer; inner surface with a keel along the middle, separating two rows of 
mouths of short tubular cells, which extend a variable length obliquely downwards and inwards into the 
interior of the branch; dissepiments usually without cells; a small row of cells occasionally on the 
mesial keel; the non-celluliferous side formed internally of a layer of vertical capillary tubules. 
Allied to Tubulipora rather than to Gorgonia, with which it is often confounded, though that genus 
has a solid axis and the cells scattered in an external granular crust: etepora differs by having the 
net-work of anastomosing branches with simple impressed cells, no dissepiments, and a solid interior. 
M. dOrbigny (Prod. p. 153) proposes the name Fenestrellina for those with a row of small distant pores 
on the keel, separating the two main rows of cell-mouths, and Reteporina (Prod. p. 101) for those in 
which the two rows of cells are not separated by a keel. 
FENESTELLA MILLER (Lonsd.) 
Ref.—Lonsd. Sil. Syst. t. 15. f. 17. 
Sp. Ch.—Corallum forming undulated fan-shaped expansions, two or three inches long; interstices 
slender, about five or six in the space of two lines, usually bifurcating at distances of about two to three 
H 
