131 
Fenestclla, fossula, Lonsdale, 1845, in Strzelecki’s Phys. Descr. N.S. Wales, p. 
269, pi. 9, fig. 1. 
)3 s) J- D- Dana, 1849, Geol. Wilkes TT. S. Explor. Exped., p. 710, 
pi. 11, fig. 3. 
„ pleheia, A. d’Orbigny, 1850, Proclr. Pal., I, p. 152. 
„ „ (partim), J. Morris, 1854, Cat. Brit. Eoss., p. 123. 
McCoy, 1851, Brit. Pal. Eoss., p. 114 (non Phillips). 
E. d’Eichwald, 1859, Lethasa Eossica, I, p. 358, pi. 23, fig. 9. 
Ludwig, 1862, Pal. Urals, p. 46, pi. 18, fig. 2. 
Kirkby, 1862, Ann. Mag. Nat. Hist., X (3), p. 204, pi. 4, fig. 
14, 15, 18. 
H. C. Billings und W. Keferstein, 1862-1863, Klassen u. 
Ordn. Thierr., Ill, p. 8, fig. 2. 
P. Semenow and v. Moller, 1864, Bull. Acad. Imp. St. Peters- 
bourg, VII, p. 233, pi. 3, fig. 16. 
E. Eoemer, 1870, Geol. Ober-Schlesien, p. 60, pi. 7, fig. 9, 10. 
Armstrong, 1871, Trans. Geol. Soc. Glasgow, III, SuppL, p. 34. 
E. B. Meek, 1872, In E. V. Hayden’s Einal Eept. U. S. Geol. 
Survey Nebraska, p. 153, pi. 7, fig. 11. 
Idem, idem, Eept. Pal. E. Nebraska, p. 153, pi. 7, fig. 11. 
E. Etheridge, 1872, Quart. Journ. Geol. Soc. XXXVI, p. 332, 
pi. 25, fig. 1. 
L. G. de Koninck, 1873, Nouv. Eech. Anim. Eoss. Carb. 
Belg., II, pi. 1, fig. 3. 
The coenoecmm of this species consists of a large number of small 
branches very thin and straight, often hi furcating, and decidedly parallel. These 
branches, taken altogether, have the form of a large funnel, and are sepa- 
rated from each other by a space equal to their own diameter; they are joined 
together by cross-bars still smaller than themselves. These cross-bars alter- 
nate, and form rectangular fenestrules, of which the long sides, produced by 
the branches, have nearly twice the length of the short sides. The anterior 
surface of the branches has a mesial keel, not well marked, on the sides of 
which are small cells, the non-marginal openings of which form alternating 
rows ; four or five of these perfectly circular openings occupy each length of 
the branch between two cross-bars. The posterior surface of the branches is 
ornamented with fine longitudinal striae, rather irregular, and not distinctly 
marked. 
T 
mrgosa, 
pleheia, 
pleheia ? 
devonica, 
pleheia, 
fossula, 
pleheia. 
