.11CKLES AND BAS.SLER.] SYSTEMATIC POSITION OK CJENEKA. 



57 



Rhabdinopora Eichwald. 



Rhahd'mopord Eichwald, Lethjta Rossica, I, 18H0, 51. 3HS. 



Two species, R. jlaheUiformis Kiohwald and R. vndulata Eichwald, 

 are o-iven. Seems to be a fenestellid with one row of cells to the 

 hi'anch; this is a type unknown to us, unless it be a case of defective 

 observation. 



Seriopora Pocta. 



Seriopora Pocta, Systcme Silurien Boheme, VIII, tome 1, 1804, \^. 78. Genotype: 

 .S'. jM'tala Pocta, loc. cit., p. 79, pi. xiii, 8-12. 



Pocta has undoubtedly wrongly interpreted D'Orbigny's genus Rete- 

 porina^ which was based on Goldfuss's Reteponi prhca. Pocta's Serio- 

 2)ora is the Retejxmna of D'Orbigny. as interpreted by Simpson and 

 as we give it; Pocta's Reteporina (loc. cit., p. 80) appears to be in 

 part FeneateUa and perhaps, in part, another as j^et unnamed genus of 

 the Feuestellida?. 



SuLCORETEPORA D^Orbigny. 



»S'«fcorrf,epom D'Orbigny, Prodr. de Pal., I, 1850, p. 152. 



This genus was based upon Flustra parallela Phillips, 1833. The 

 detinition given is too meager for recognition. The JFlustr a parallela 

 of Phillips is now considered to be a Cystodictya. 



Utropora Pocta. 



Utropora Pocta, Systeme Silurien Boheme, VIII, tome 1, 1894, p. 75. Genotype: 

 U. nohlUs (Barrande) Pocta, loc. cit., p. 76, pi. 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. 



Genus. 

 Acanthocladia Kmg. 

 Acanthoclema Hall. 

 Acrogenia Hall. 

 Actinotrypa Ulrich. 

 Amplexopora Ulrich. 

 Anisotrypa Ulrich. 

 Anolotichia Ulrich. 

 Archimedes Owen. 

 Arthroclema Billings. 

 Arthropora Ulrich. 

 Arthrostylus Ulrich. 

 Ascodictyon Nicholson and 



Etheridgc Juii. 

 Aspidopora Ulrich. 

 Atactopora Ulrich. 



Family. 

 Acanthocladiidse. 

 Rhabdomesontidye. 

 Cystodictyonidee. 

 Actinotrypid?e. 

 Amplexoporidje. 

 Batostomellidse. 

 Ceramoporidse. 

 Fenestellidse. 

 Arthrostylidje. 

 Ptilodictyonidte. 

 Arthrostylidse. 

 Ascodictyon idee. 



Monticuliporidye. 

 Heterotrypidae. 



Suborder. 

 Cryptostomata. 

 Cryptostomata. 

 Cryptostomata. 

 Cryptostomata. 

 Trepostomata. 

 Trepostomata. 

 Cyclostomata. 

 Crypto.stomata. 

 Crj'ptostomata. 

 Cryptostomata. 

 Cryptostomata. 

 Ctenostomata. 



Trepostomata. 

 Trepostomata. 



