57 



und bei dem Langsschnitt durch den centralen Sipho gut ausgepnigten 

 Siphonaldiiten. 



Remelk hat in der genannten Arbeit zwei Varietiiten von Lit nit es nngclini 

 var. virgata und var. lincata unterschieden. Bei dem chinesischen Exemplar 

 konnte nur die Zugehorigkeit zu der bezeichnenden Hauptart festgestellt 

 we r den." 



Locality : — No-lu-ping, Tung-hu-hsien, prov. Hu-pei (Usui Coll.). 



Trilobita. 



Asaphidae, 

 Isotelus, Dekay. 



Isotelus usLiii \'abe sp. nov. 

 PI. XVIII., Fig. 9 ; H- XIX., Fig. 8. 



191 1. Isotelus sp. Frech : in Richthofen'.s China, vol. v., p. 3. 



Cephalon parabolic, about 2/3 as long as wide, pointed in front, and pro- 

 longed behind in genal spine ; convex. Glabella hardly defined from the re- 

 maining part of the cranidium, with very faint trace of almost parallel dorsal 

 furrows at base, as wide apart as 1 /4 the width of the cephalon. Facial sutures 

 unite at a blunt angle in front, curve first strongly outwards and then inwards 

 to eyes, behind which they bend again sharply outwards to cut posterior mar- 

 gin in a very acute angle at little more than half the distance between glabella 

 and genal angles. Free cheek trigonal ; genal spine slender, slightly curved 

 and directed backward ; as long as 4 thoracic segments. Eye lobe moderate 

 in size. 



Thorax with 8 segments preserved ; axial lobe cylindrical, as wide as the 

 pleurae. Pleurae consist of inner horizontal straight portion and outer curved 

 portion which bends downward and slightly backward ; rounded at the e.x- 

 -tremity ; and provided with a broad strong furrow. 



Dimensions: — Cephalon (measured along the chord) 23 mm. wide and 

 15 mm. long ; thorax 32 mm. wide and 14 mm. long. 



