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RHABDINOPORA Eichwald.

Rhabdinopora Eichwald, Lethæa Rossica, I, 1860, p. 368.

Two species, R. flabelliformis Eichwald and R. undulata Eichwald, are given. Seems to be a fenestellid with one row of cells to the branch; this is a type unknown to us, unless it be a case of defective observation.

SERIOPORA Počta.

Seriopora Počta, Système Silurien Bohême, VIII, tome 1, 1894, p. 78. Genotype: S. petala Počta, loc. cit., p. 79, pl. xiii, 8-12.

Počta has undoubtedly wrongly interpreted D'Orbigny's genus Reteporina, which was based on Goldfuss's Retepora prisca. Počta's Seriopora is the Reteporina of D'Orbigny, as interpreted by Simpson and as we give it; Počta's Reteporina (loc. cit., p. 80) appears to be in part Fenestella and perhaps, in part, another as yet unnamed genus of the Fenestellida.

SULCORETEPORA D'Orbigny.

Sulcoretepora D'Orbigny, Prodr. de Pal., I, 1850, p. 152.

This genus was based upon Flustra parallela Phillips, 1833. The definition given is too meager for recognition. The Flustra parallela of Phillips is now considered to be a Cystodictya.

UTROPORA Počta.

Utropora Počta, Système Silurien Bohême, VIII, tome 1, 1894, p. 75. Genotype: U. nobilis (Barrande) Počta, loc. cit., p. 76, pl. xvii, 4–17.

Like Fenestella, but differs chiefly in having very much elongated fenestrules (6 by 1 mms.) and in lacking a median keel.

LIST OF GENERA, SHOWING SYSTEMATIC POSITION.

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Actinostoma Young and Young=Fenestella Lonsdale.

Alecto Lamouroux (preoccupied). Now Stomatopora Bronn.
Anastomopora Simpson=Reteporidra.

Arcanopora Vine-Cystodictya Ulrich.

Archimedipora D'Orbigny=Archimedes Owen.

Arthronema Ulrich (preoccupied). Now Arthrostylus Ulrich.
Carinella Etheridge, Jun. Now Goniocladia Etheridge, Jun.
Carinopora Nicholson Semicoscinium Prout.

Coscinotrypa Hall and Simpson=Coscinium Keyserling.
Cryptopora Nicholson Semicoscinium Prout.

Cycloporina Simpson=Semicoscinium Prout.

Dendricopora De Koninck=Ptilopora McCoy.

Dianulites Eichwald.

Diastopora of authors (not Lamouroux) = Berenicea Lamouroux.

Diastoporella Vine-Berenicea Lamouroux.

Didymopora Ulrich Fistulipora McCoy.

Diplopora Young and Young-Diploporaria.

Dybowskia Waagen and Pichl=Fistulipora McCoy.

Dybowskiella Waagen and Pichl=Fistulipora McCoy.
Enallopora D'Orbigny. Not recognized.

Fenestrellina D'Orbigny. Not recognized.
Fistulicella Simpson=Pinacotrypa Ulrich.
Fistuliporella Simpson=Fistulipora McCoy.
Fistuliporidra Simpson Favicella Hall.
Fistuliporina Simpson=Pinacotrypa Ulrich.
Flabelliporella Simpson Polypora McCoy.

Flabelliporina Simpson-Fenestella Lonsdale.

Geinitzella Waagen and Wentzel Batostomella Ulrich.

Glauconome of authors (not Goldfuss) = Pinnatopora Vine.

Heterodictya Nicholson Ptilodictya Lonsdale..

Lichenalia Hall (in part)=Fistulipora McCoy.

Lyroporella Simpson-Lyropora Hall.

Lyroporidra Simpson-Lyropora Hall.

Lyroporina Simpson Lyropora Hall.

Nebulipora McCoy. Not recognized.

Nicholsonia Davis-Hederella Hall.

Nicholsonia Waagen and Wentzel=Escharopora Hall.

Odontotrypa Hall Buskopora Ulrich.

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