CYCLOPHTHALMUS. 19 



Archaeoctonus tuberculatus (Peach). 



1883. Eoscorjnus tuberculatus, B. N. Peach, Trans. Eoy. Soc. Edmb., vol. xxx, p. 398, pi. xxiii, 

 figs. 8--8h. 



Possibly not belonging to the genus Archaeoctonus, since the ambulatory 

 appendages are unknown and the chelae unfigured and indifferently described. 

 Specifically A. tuberculatus differs from A. glaber in having the terga of the 

 abdominal portion dotted with small tubercles, and ornamented with two rows of 

 larger tubercles along the posterior margin. 



Total length supposed to be about 62 mm. 



This species was based upon several pieces obtained from the Coal Measures at 

 Blair Point, near Dysart, and from the Calciferous Sandstone Series from Kedhall 

 and Cramond, near Edinburgh. 



Genus CYCLOPHTHALMUS, Corda, 



1835. Cyclophthalmus, A. J. C. Corda, Verh. G-es. Mus. Bohm., p. 36. 

 1904. Cyclophthalmus, A. Fritsch, Palasoz. Araclm., pp. 65 — 68. 



For reasons already given (p. 12) this genus is here recorded for the reception 

 of the Scorpion described by Peach as Eoscorpius euglyptus. 



Cyclophthalmus euglyptus (Peach). Text-figure 4. 



1883. Eoscorpius euglyptus, B. N. Peach, Trans. Eoy. Soc. Edinb., vol. xxx, pp. 402 — 404, pi. xxii, 

 figs. 3 to 3 d. 



This species was based on a single specimen obtained near the base of the 

 Cementstone Group, Calciferous Sandstone (Lower Carboniferous), near Langholm, 

 Dumfriesshire, in Scotland. The ventral surface of the prosoma, with complete 

 chelicerae and chela? and incomplete walking legs, is exposed, the structure of the 

 coxae, sternum, genital operculum and pectines being well shown. 



The chelicerae and chelae are large, the chela? being heavy and massive ; the 

 hand is ovally elongate in profile view, considerably longer than wide, and a little 

 wider than the brachium ; the fingers are arcuate and basally lobate, the movable 

 being but little longer than the back of the hand. The sternum is pentagonal ; 

 the pectines are large and ornamented with squamiform sculpture. 



Judp'ino- from Peach's restoration the measurements in mm. of the chela? are as 

 follows : 



