OP THE SPECIES. 73 



The facial suture couimenccs at the anterior margin far towards the outer side, turns 

 inwards with a curve towards tlie eye, forms a small covering plate, and then runs towards 

 the posterior angle, before which near the inner part it penetrates the posterior margin. 

 The angle itself is furnished with a short straight spine. 



Body fourteen -jointed, the axis narrower than the lateral lobes, very convex; the 

 lateral lobes quite horizontal, of equal breadth, deeply sulcated in their whole length ; from 

 the centre they begin to curve downwards almost at a right angle, and are rounded at the 

 extremity ; they are separated at the base from the axis by a deep furrow.* 



Caudal shield semicircular, very convex anteriorly, with a five-jointed axis, and slight 

 furrows on the sides. 



Localiiy. — In the grauwacke of Bohemia, at Ginu. 



1. C. Sulzeri: Oculis juxta apicem tuberculi frontalis. Long. VA-V . Table I, Fig. 10. 



Ref. — KiNSKY, in Bom's Ahh. etc., I, Figs. 1, 2, 3. Triloh. Sidz. Schloth. Nachtr. ii, 



28. 1, and 34. 5, Table XXII, Fig. 1. Dalm. Palcead. 75. I. Sternb. Verhandl. 



d. Vaterland. Mus. 1825. 81. 4, Table II, Fig. 1, A. Boeck, vI%. for Natur. Sc. 



Figs. 20, 21, Trilob. Zippii. Conoc. costafus, Zenk. Beifr. 49. 15, Table IV, Fig. 



G-K. Milne Edw. Crust, iii, 336. 

 Syn.— Conoc. Suheri, Bronn, Lethaa, 1. 121. 110, Table IX, Fig. 15. Emmr. A'»?. 



43. 1. QuENST. in Wieffm. ArcJiiv. 1837, i, 347. 

 Glabella very much contracted anteriorly, and almost rounded ; before it, and behind 

 the thickened margin, there is a peculiar transverse fold. 



Eyes small, situated on tubercles immediately beside the anterior angles of the glabella, 

 whence the facial suture continues directly across the sides, dividing the narrow cheek-shield. 

 Body rings and caudal shield not remarkable. 



2. C. striatus : Oculis in medio partium lateralium scuti cephalici. Long. lJ^-2". Table I, Fig. 9. 

 Äe/:— Emmr. Diss. 43. 2, C fig. Trilob. Sulz. var. Sternb. II, I, A, and Table I, Fig. 3. 



QUENSTEDT, /. C. 348. 



Similar to the preceding species in size, habit, and structure ; but the cephalic shield 

 totally different. The glabella at the anterior part is broader, straightly truncated, and 

 merely furnished with rounded angles ; there is no transverse fold in front of it. 



The eyes are more distinct, attached to the centre of the lateral parts of the cephalic 

 shield, and bearing the same proportion to the facial suture ; but a sharp ridge extends itself 

 towards them from the angles of the glabella. 



The cheek-shields are not narrow and elongated, but short and broad, and only reach 

 half as far anteriorly as in the last species. 



Boeck was the first to point out the differences which constitute this a species, although 

 Count Sternberg had previously observed it. By mistake, however, he confounded the 



* Zenker (/. c), and after bim Quenstedt and Emmericb, regard tbis furrow as the indication of an 

 articulation or suture ; but since in every specimen the impression is merely that of an internal shelly 

 surface, the indentation is more probably the impression of an elevated ridge, -nhich may have served 

 for the insertion of the muscles of the legs. The analogy of all other Trilobites is against the existence 

 of a suture. 



10 



