46 TERRESTRIAL CARBONIFEROUS ARAGHNIDA. 



sclerites separated by a narrow median suboblong area. Opisthosoma bearing eight 

 tergal plates, of which the anterior five are short and nearly straight or slightly 

 recurved, indicating that the posterior border of the carapace was also straight 

 from side to side ; these are followed by the three normal large plates. 



With the exception of the three plates lying behind the sternum of the 

 prosoma and the coxa? of the legs of the fourth pair, the significance of which is 

 obscure, the morphology of this Arachnid, judging from the figure, seems to be 

 clear. Judging from the size of the sternum of the prosoma and the wide separation 

 of the coxa? of the legs of the first and fourth pairs, Phalangiotarbus is the least 

 specialised member of the Phalangiotarbi. 



Genus PHALANGIOTARBUS, Haase. 



1872. Architarbus, H. Woodward, Geol. Mag., vol. ix, p. 885, pi. ix, fig. 1 a—b (»ec Scudder). 



1890. Phalangiotarbus, E. Haase, Zeitschr. deutscli. geol. G-es., vol. xlii, pp. 638 and 650, pi. xxx, 



fig. 3. 

 1910. Phalangiotarbus, E. I. Pococlc, Geol. Mag. [5], vol. vii, pp. 510 and 512. 



CX.4-. 



Fig. 17. — Phalangiotarbus subovalis (Woodward); ventral surface of the prosoma and dorsal surface of the 

 opisthosoma exposed, three times nat. size. — Coal Measures; Lancashire, ex. p., coxa of palp ; ex. 1, 

 coxa of first leg; ex. 4, coxa of fourth leg. After H. Woodward, Geol. Mag., vol. ix, pi. ix, fig. 1. 



Characters as above. 



Type Species. — Architarbus subovalis, H. Woodward. 



Phalangiotarbus subovalis (H. Woodward). Text-figure 17. 



1872. Architarbus subovalis, H. Woodward, Geol. Mag., vol. ix, p. 385, pi. ix, fig. 1 a — 6. 



1890. Phalangiotarbus subovalis, E. Haase, Zeitschr. deutsch. geol. Ges., vol. xlii, pp. 638 and 650, 



pi. xxx, fig. 3. 

 1904. Architarbus subovalis, A. Eritscb, Palasoz. Araclm., p. 35, fig. 39. 

 1910. Phalangiotarbus subovalis, E. I. Pocock, Geol. Mag. [5], vol. vii, p. 510. 



