E. I. Pocock — On Eophrymis and Allied Arachnida. 439. 



tootli is 26 mm., its height 41 mm. I have been unable to find any 

 form closely similar to this, but it seems to resemble some hypselodont 

 teeth figured by Rodler & Weithofer (" Die Wiederkauer der Fauna 

 von Maragha," pi. iv, fig. 5 : Denkschr. k. Ak. Wissenschaften, 

 Wien, vol. Ivii, 1890, p. 770). The animal was no doubt an antelope, 

 and probably a large gazelle-like form. A horn-core which is some- 

 what laterally compressed, especially on its outer side, probably belongs 

 to this animal. Its curves are like those of some gazelle horns. 



The collection also includes remains of crocodiles, Trionyx and 

 other Chelonians, and fish. 



The stratigraphy of the beds in which these bones were found 

 is described in detail by Blanckenhorn in " Neues zur Geologie 

 und Palaeontologie Aegyptens," pt. iv (Zeitschr. d. Deutsch. geolog. 

 Gesellschaft, 1901, p. 301), to which reference may be made for 

 further information on this point. He regards the beds as Lower 

 Pliocene, which agrees well with the conclusions arrived at from 

 the consideration of the mammalian fauna, the horizon of which is 

 probably a little later than that of Casino, and is, therefore, either 

 late lower or early middle Pliocene. 



II. EOFHRYNUS AND AlLIED CaEBONIFEROUS AkACHNIDA. 



By R. I. Pocock, F.Z.S., of the British Museum (Natural History). 



Paet I. 



Introduction. 



FOR the opportunity to study the interesting Carboniferous 

 Arachnid forming the subject-matter of the following pages, 

 I am indebted to the kindness of Dr. Henry Woodward, F.R.S., 

 who recently placed in my hands for that purpose a very perfect 

 gutta-percha cast, and a good, though less complete one, in plaster, 

 of the original fossil specimen, which was unfortunately not available 

 for examination in its natural form. 



The typical species of the genus EopJirynus was described and 

 figured from an imperfect specimen by Buckland in 1836. Dr. H. 

 Woodward in 1871 correctly assigned this fossil to the Arachnida. 

 Buckland regarded it as the remains of a coleopterous insect, and 

 named it Curculioides prestvicii. The genus Curculioides also con- 

 tained a species named ansticii, the systematic position of which is 

 still in doubt.^ 



1 Four pairs of appendages are represented as attached to the anterior portion of 

 the body, to the front border of which a separate transverse sclerite was apparently 

 articulated. Buckland regarded this sclerite as the head, and the appendages as the 

 antennae and three pairs of legs of a beetle. No segments are described in connection 

 with the abdomen, but, judging by the figure, this region was furnished with a large 

 circular anal orifice. Scudder (Proc. Amer. Acad. Arts and Sci., vol. xx, 1882, p. 17) 

 provisionally placed this species in the Arachnida, near Architarlus. I suggest that 

 it may be an Arachnid allied to the recent Cryptostemma. In the latter the large 

 circular and gaping anus is a very marked featui'e ; there is a movable sclerite jointed 

 to the anterior border of the carapace and completely conceahng the mandibles ; the 

 appendages of the second pair are tucked beneath the prosoma when at rest, so that 

 from its dorsal side the animal exhibits only four pairs of limbs. In these three 

 features Cryptostemma resembles Curculioides ansticii. 



