94 Alexander Peirunkevitch, 



the anal operculum normally appearing on the ventral surface of 

 the specimen represents the tergite of the last abdominal segment, 

 then the anal operculum is the tergite of the eleventh and not of the 

 tenth segment. This is clear from Pocock's own text figures 29—31 

 and his assertion that in front of the first large tergite is at least one 

 segment partly covered by the cephalothorax. 



Pocock recognized four families of Anthracomarti, basing his 

 classification on the shape of the pleural laminae and the presence of a 

 transverse sulcus on the cephalothorax. Neither of these characters 

 has in my opinion the value of a family character. We find in the 

 order of recent spiders widely different chitinized structures of the 

 abdomen in species belonging to the same genus and even in the two 

 sexes of the same species. A much better character seems to be the 

 number of pleural sclerites. I therefore recognize only two families. 



The order of Anthracomarti consists entirely of extinct forms. 



Key to the Families of Anthracomarti. 

 1. Pleural laminae subdivided 



Anthracomartidae 

 (= Anthracomartidae + Brachy- 

 pygidae Pocock) 

 + pleural laminea entire 



Eophrynidae 



(= Eophrynidae + Anthracosiron- 

 idae Pocock) 



LIST OF DESCRIBED SPECIES OF ANTHRACOiVL\RTI. 

 Family Anthracomartidae. 

 Genus Anthracomartus Karsch. 

 Genotype — A. voelkelianus Karsch. 



1. A. voelkelianus Karsch, Zeits. deutsch. geol. Gesell., Vol. XXXIV, 

 1882, p. 556. Haase, Beitrag z. Kenntniss d. foss. Arachn., Ibid., 

 Vol. XLII, 1890, p. 645, pi. XXX, figs. 8, 9. Fritsch, Pal. Arachn. 

 1904, p. 40, text fig. 47. 



From the Coal Measures of Silesia, Germany. 



2. A. granulatus Fritsch, loc. cit., p. 40, text fig. 48. 



From the Coal Measures of Silesia, Germany. 



3. A. palatinus Ammon, Geogn. Jahresb., Vol. XIII, 1900, figs. 1—4. 

 Fritsch, Pal. Arachn., 1904, p. 41, text fig. 50. 



From the Coal Measures of Palatinate (Pfalz), Germany. 



4. A. krejcii Kusta, Sitz. k. b. Gesell. d. Wiss., 1883, p. 340, pi. I. 

 } = A. af finis Id., Ibid., 1885. 



