46 TERRESTRIAL CARBONIFEROUS ARACHNIDA. 



sclcrites separated by a narrow median t>ul)ol)]ong area. Opistliosoma Ijearing eight 

 tergal plates, of wliicli 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 coxeb of the legs of the fourth ])air, the significance of which is 

 obscure, the mor})liology 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, PJtahnKjiotarbns is the least 

 specialised member of the Phalangiotarbi. 



Genus PHALANGIOTARBUS, Haase. 



1872. Arcliitarhus, H. Woodward, Geol. Mag., vol. ix, p. 385, pi. ix, fig. 1 a —I (nee Scudder). 



1890. Plialancjiotarbus, E. Haase, Zeitsclir. deutscli. geol. Ges., vol. xlii, pp. 638 and 650, pi. xxx, 



fig. 3. 

 1910. Fhalangiotarhiis, R. I. Pococ-lc, Geol. Mag. [5], vol. vii, pp. 510 and 512. 



r,r.4. 



Fig. 17. — rhalanfjiotarhus suhovalis (Woodward); ventral surface of the pro-sonia and dorsal surface of the 

 opisthosonia exposed, three times nat. size.- — Coal Measures; Lancashire, ci. f>., coxa of palp ; ex. 1, 

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



Characters as above. 



Type Species. — Architarlms snhovalis, H. Woodward. 



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



1872. ArchHarhiis .?H?wra//4.', H. Woodward, Geol. Mag., vol. ix, p. 385, pi. ix, fig. 1 a—h. 



1890. Phalangiotarbvs svhovalis, E. Haase, Zeitsclir. deutscli. geol. Ges., vol. xlii, pi>. 638 and 650, 



pi. xxx, fig. 3. 

 1904. Architarlms subovalis, A. Fritscli, Palaeoz. Aracliu., p. 35, fig. 39. 

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



