74 SYSTEMATIC ARRANGEMENT 



names, regarding the true C. Siiheri as the new species. Quenstedt acknowledged the 

 points of specific difference without noticing what had been done before ; and Emmerich at 

 length gave the name. 



Genus 9. — Ellipsocephalus, Zenker. 



Cephahc shield similar in outline to that of the preceding genus, but quite distinct in 

 construction, being flatter and without posterior prolonged angles ; the anterior margin also 

 is not elevated.* The glabella is divided from the shield by a slight indentation, equally 

 broad, rounded at the anterior part, without transverse furrows, and even without a posterior 

 articular fold. 



Eyes oblong lunate, very narrow, and projecting outwards. Facial suture short, com- 

 mencing at the anterior part at the margin before the eyes, and curving over them towards 

 the posterior angle. Joints of the body twelve, the axis nearly as broad as the lateral lobes, 

 depressed. The lateral lobes at first horizontal, rather flat, and almost without furrow ; 

 then curved downwards, more deeply furrowed, but the furrow pointed inferiorly ; with an 

 anterior surface transversely affixed, indicating a deficiency of power in the creature to roll 

 itself into a ball. The extremity is thus rendered obtuse-angled. 

 Caudal shield small, semicircular; the axis one-jointed. 



Locality. — The Palaeozoic rocks (grauwacke) of Bohemia. The only known species 

 attains a length of about 1 M inches, and is E. Hoßi. Table I, Fig. 8. 



Ref. — KiNSKY in Bom's Abhandl. 1. 246, Fig. 6. TrUohites Hoff. Schloth. Nachfr. ii, 

 30. 2, and 34. 6, Table XXII, Fig. 2, a, h. Count Sternberg, VerhancU. d. ratal 

 Mus. 1825. 83, Table II, Fig. 4, and 1833. 50. Dalm. Palcead. 76. 2. Boeck, 

 Ma(/.f. Naturv. I, Figs. 14, 17, 19. 

 Syn. — ElUjjsocephalus ambiguus, Zenk. Beitr. 51, Table IV, Figs. G, K. Milne Edw. 

 Cr. iii, 344. JEllips. Hoßi, Bronn, Lethaia, 1. 122. Ill, Table IX, Fig. 18. 

 Emmr. Dissert. 44, VI. 1. Calymene decipiens, König, /co/^ sect, i, 2, Table III, 

 Fig. 32. 



Genus 10. — Harpes, Goldfuss. 



Cephalic shield very large, in the shape of a horseshoe, very convex in the centre, 

 flatly expanded at the whole external margin ; the posterior angles long, and projecting 

 beyond the centre of the body. The glabella is very prominent, oval, and does not 

 reach to the anterior margin ; it becomes narrower at the posterior part before the margin 

 of articulation, and is furnished with a double impression, which separates two elliptical 

 lateral lobes from its posterior half; by the side of it externally there is also a slight trace 

 of a third arch-like impression and lobe. 



Eyes indistinct, small, appearing in the shape of knobs at both sides beside the anterior 

 half of the glabella. 



* The impressious occur iu two kiuds of forms ; some have uo elevated mai-giu, others only 

 exhibit the impression of it as an indentation in the matrix. Accordiug to this, there seems to have 

 been a reflexed margin only at the lower side of the cephalic shield. This appears to me to be the 

 case also with regard to Conoceplialus. 



