7Q TERRESTRIAL CARBONIFEROUS ARACHNIDA. 



Tri<]on()tarhtis aiuoiigst the Aiitliracosirouidre, and very different from those of 

 the Authracomartida?. 



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



«. Tlie posterior boi-Jers of the terga ami of the pleural lamiuae of the opisthosoiiia 



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



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



of the opisthosoma forming a markedly recurved line. 



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



in Aphantomartus ...... Kreischeria. 



h'. Carapace with median sulcus short and eyes apjjro.ximately central, Eojihnjjius. 



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

 British deposits, have been referred to this family : 



Stenotrogidns, Frit&ch, l)ased on Eoj^ltri/nns salmi, Stur; Gijclotrogidiis, Fritsch, 

 based on Eophrynus stitri, Haase; Fetrovicia, Fritsch, type 1\ proditorin, Fritsch; 

 Hemihreisidieria, Fritsch, based on Kreischeria geinitzi, Theveniu (= tJievenini, 

 Fritsch).^ 



The typical species of Stenofrogidiis, Ci/(iofroguli(s, and Bemihrelsclieria are 

 certainly closely related to the species referred here to Eoplivijnus 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 unaljle to 

 place confidence in Fritscli's restorations. The same applies to Fetrovicia. 



Genus EOPHRYNUS, H. A7oodward. 



1837. Curctilivides, W. Buckland, Bridgewatcr Treatise (2nd ed.), vol. ii, p. 76 (in i^M-t, jircsfricil). 



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



1902-1903. Eophrynus, R. I. Pocock, Gleol. Mag. [4J, vol. ix, pp. 439—448 and 487—493; also 



vol. X, pp. 250—251. 

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



Type Species. — Eophrynus predoici (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 tjeinitzi was cited by Theveniu (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 auinial. I have therefore assio-ned the 

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

 Valenciennes in France, as Kreischeria geinitzi. 



