76 TERRESTRIAL CARBONIFEROUS ARACHNIDA. 



Trigonotarbus amongst the Anthracosironidse, and very different from those of 

 the Anthracomartidse. 



The three British genera of this group may be distinguished as follows : 



a. The posterior borders of the terga and of the pleural laminae of the opistliosoma 



forming a transverse straight line, in no sense recurved . . Aphantomartus. 



a. The posterior borders of the terga and of their pleural laminae in the posterior half 



of the opistliosoma forming a markedly recurved line. 



b. Carapace with median sulcus long and eyes far in advance of the middle, as 



in Aphantomartus ...... Kreischeria. 



V. Carapace with median sulcus short and eyes approximately central. Eophrynus. 



In addition to the genera diagnosed above the following, not yet recorded from 

 British deposits, have been referred to this family : 



Stenotrogv.lus, Fritsch, based on Eophryrms salmi, Stu'r ; Gyclotrogulus, Fritsch, 

 based on Eophrynus sturi, Haase; Petrovicia, Fritsch, type P. proditoria, Fritsch; 

 Hemikreischeria, Fritsch, based on Kreischeria geinitzi, Thevenin (= thevenini, 

 Fritsch). 1 



The typical species of Stenotrogulus, Gyclotrogulus, and Hemikreischeria are 

 certainly closely related to the species referred here to Eophrynus and Kreischeria, 

 whatever be the value of the genera themselves. On the latter point, however, I 

 can give no opinion since I have not seen the type specimens and am unable to 

 place confidence in Fritsch's restorations. The same applies to Petrovicia. 



Genus EOPHRYNUS, H. Woodward. 



1837. Curculioides, W. Buckland, Bridgewater Treatise (2nd ed.), vol. ii, p. 76 (in part, prestvicii). 



1871. Eophrynus, H. Woodward, Geol. Mag., vol. viii, p. 386, pi. xi. 



1902-1903. Eophrynus, R. I. Pococlc, Geol. Mag. [4], vol. ix, pp. 439—448 and 487—493 ; also 



vol. x, pp. 250—251. 

 1904. Eophrynus, A. Fritsch, Palaeoz. Arachn., p. 46. 



Type Species. — Eophrynus prestoici (Buckland). 



Since no new material of this genus has come to hand since 1902 — 3, I have 

 nothing to add to the description I gave of this genus in those years. The difficult 

 morphological features then discussed remain as obscure as before. 



1 Kreischeria geinitzi was cited by Thevenin (Proc. Verb. Soc. d'Hist. Nat. d'Autun, vol. xv, p. 195, 

 1902), who ascribed the specific name to Brongniart. The species was re-named by Fritsch on the 

 grounds that Brongniart gave no diagnosis or figure of the animal. I have therefore assigned the 

 species to Thevenin, who figured and described the type specimen, from the Coal Measures of 

 Valenciennes in France, as Kreischeria geinitzi. 



