72 SYSTEMATIC ARRANGEMENT 



than usual posteriorly, and is there furnished with a deep transverse furrow before the 

 straight margin, and is drawn out at each side into three pointed marginal processes, which 

 are situated lower than the general surface, and which issue from the deflexed margin. 



Locality. — The alumslate of Andrarum. 



Remarks. — ] . Wablenberg, who states that he has seen a perfectly preserved individual of this 

 species at Copenhagen, describes it as having twelve body-rings with very short lateral lobes, which are 

 pointed towards the posterior part ; he has, however, represented the glabella and the caudal axis much 

 too broad, and for this reason I am inclined to consider the body axis as also too broad. 



2. Harlan [Med. and Phys. Rev. 400 et seq.) describes two new forms, nearly related to Par. 

 scaratxcoides. He speaks of them as Parad. triarttirus (I. c. 401. 1, Fig. 5), and Parad. arcuatus (/. c. 

 403. 2, Figs. 1, 2, 3). Both are from the carboniferous striita (?) of Utica, in New York. They are 

 imperfect heads, which certainly resemble the fragments of 01. scarabaoides, but which still require a 

 further investigation as to their true organization. The author compares them with Triarttirus Beckii 

 (Green, 3Ion. 87, Fig. 6), with which they certainly seem to be related. 



3. I shall treat more particularly in the Appendix of Triarttirus Beckii and Trilobites Slernbergi, 

 which probably belong to the Oleneides. 



4. I beg once more to remind my readers that I have mentioned Paradoxides spinulosus, Olenus 

 forficida, and Olen. scarabceoides, as species which are both imperfectly known to me, and the correct 

 arrangement of which in systematic order I cannot guarantee ; this is still more the case with the other 

 species of other authors, which I have only enumerated here hypothetically. 



GROUP THE SECOND. 



77te lateral lobes of the hodt/-nngs not horizontally extended in their whole length, hut turned 

 downwards from the centre, and not terminatiny in a point, hut with an arched and rounded 

 extremity. Furrowed on the surface alony their whole lenyth. C.\mpylopleuri.* 



I am only perfectly acquainted with the first two of the three genera enumerated in 

 this group ; they are recognizable by their smaller, semilunar, cephalic shield, by their 

 fewer number of joints (twelve to fourteen), and by their simple, semicircular, caudal 

 shield. The one, Conocephalus, has fourteen rings ; the other, EUipsocephahis, twelve. The 

 third genus, Hmpes, has a very large cephalic shield, shaped like a horseshoe, with long 

 posterior angles, and is stated to have twenty-eight rings. 



Genus 8. — Conocephalus, Zenker. 



Cephalic shield not unlike a half-moon, but the posterior internal margin only slighth^ 

 bent. Glabella separated by a deep furrow from the lateral lobes, becoming more narrow 

 towards the anterior part, divided by four furrows at each side into four lobes, and 

 becoming broader from the anterior to the posterior part ; behind the fourth lobe there is 

 a reflexed margin of articulation. The lateral parts, together with the cheek-shield, are 

 highly convex, surrounded by a furrow and by a thickened margin. 



Eyes small, but certainly present ; partly fixed at the anterior part beside the angles 

 of the glabella, partly at the centre of the sides. 



* The following generic names, and the names of larger groups thence derived, have been alread}- 

 made use of to designate various tribes of Locusts. 



