Mr. Salter on Palceozoic Fossils from South Africa. 221 



front. The furrows are equal in strength, and the upper one straight instead of 

 sigmoid ; and there is a central pit in the large forehead-lobe. The pleurae are 

 strongly facetted. The axis not very convex. These characters will enable 

 future observers to recognize it in better specimens. 



Locality. — Gydow Pass, in a soft argillaceous sandstone. 



' Typhloniscus, genus nov. 



Body elongate, distinctly trilobed, 10?-ringedj with strongly bent and facetted 

 pleurae, produced into short spines. Glabella with radiating furrows, the forehead- 

 lobe produced. Cheeks scrobiculate, entire. Eyes and facial suture none. A 

 distinct rostral shield beneath. Tail consisting of few segments ; the pleurae free 

 at the ends. 



Typhloniscus Bainii, sp. nov. PI. XXV. fig. 14. 



T. 2i-uncialis ; glabella depressa, sulcis aequalibus; pleuris quam axi latioribus ; pygidio 

 utrimque quadrilobo. 



So much has this the appearance of Placoparia, a Lower Silurian genus found 

 in Spain and Bohemia, that one is at first tempted to believe it must have been 

 derived from different strata to those in which the other Trilobites above-described 

 occur. There is the same radiating arrangement of the glabella-furrows as in Pla- 

 coparia ; and the same triangular scrobiculate and margined cheeks, on the forward 

 angle of which the eye, minute if it existed at all, was placed : and there are the 

 abruptly-bent pleurae and an obtuse many-lobed tail. In all these points there is 

 the closest resemblance. But there are also some differences of importance. The 

 front lobe of the glabella is larger and produced forwards (not truncate), and the 

 place of the eyes, if there w^ere any, is indicated only by a tubercle at the extreme 

 front of the cheek, and this is subtended by no transverse furrow like that of 

 Placoparia. There appears to have been really no facial suture, and probably only 

 a minute eye. 



Then again, the pleurae, though abruptly bent down, are furrowed, not nodular, 

 as in Placoparia, and their distal ends are bent backwards as well as downwards. 

 There were probably fewer body-rings than in the latter genus, — ten instead of 

 twelve : this however is uncertain. 



If the above characters separate it from Placoparia, there is no section of 

 Cheirurus with which it can be closely compared ; though it is nearer to Eccopto- 

 chile than to the rest. Especially does it differ from the Devonian type of the 

 genus {Crotalocephalus, Salter), in which the furrows run right across the glabella, 

 and the eyes are well developed. 



Locality. — In a dark schist from Gydow Pass. 



