178 S. H. SCUDDER ON SPINED MYRIAPODS 



This genus, represented by a single species and a fragmentary one at that, is so evidently 

 distinct from Euphoberia, to which it is most nearly allied, that there can hardly be any 

 question of the undesirability of placing it therein even provisionally. Its definite separa- 

 tion will call attention to its distinguishing characteristics and bring to light, much sooner 

 than would otherwise be the case, allied forms in carboniferous beds. 



Amynilyspes Wortheni, nov. sp. 

 PI. 13, figs. 1-4, 9. 



A single specimen and its counterpart represent the anterior extremity of the body with 

 about ten or eleven segments. From these it would appear that the form of the body 

 itself did not taper anteriorly, the first three segments behind the head forming with it the 

 common rounded front of the body, each of the three segments becoming successively 

 narrower and shorter from behind forward, while the head, still narrower but a little 

 longer, completed the onisciform hood which all combined to form. The body appears to 

 have been stoutly arched, a little flattened above, the sides and front equally deflected, 

 and by the compression of the ventral rings perhaps reaching or nearly reaching the 

 surface on which the creature crawled. With the exception of such modifications as 

 are required for those in front to form the hood, the segments are all alike, each being 

 nearly four times broader than long, and divided about equally into a, longitudinally 

 and strongly arched anterior half, and a gently arched posterior half; both portions help to 

 form the deflected lateral lobes, which are triangular, well rounded, and terminate rather in 

 advance of the middle ; at the outer edge of the dorsal field, the anterior lobe bears on 

 each side a spine, straight, erect, simple, scarcely tapering above the basal boss until near 

 the bluntly pointed tip, about half as long as the space between the two spines of the 

 same segment ; they are borne by every segment behind the head and are just as long on 

 the narrower first and second segments as elsewhere. The head is a little more than half 

 as broad as the entire body, as seen in the specimen simple, and forms the greater part of 

 the front of the hoof-like anterior extremity of the body ; no appendages can be made out. 



The length of the fragment is 18 mm. ; its width 8.1 mm ; length of segments 2.15 

 mm. ; length of lateral deflected lobes 2.5 mm. ; length of spines 2.8 mm. ; breadth of head 

 5.4 mm. ; length of the deflected head-shield 2.9 mm. ; space between spines of same segment 

 5.6 mm. 



The single specimen comes from Mazon Creek and was received for study from Mr. P. A. 

 Armstrong. I have dedicated the species to Professor A. H. Worthen, who was the first, 

 with Mr. Meek, to detect the myriapodan character of these spined articulates in his Illinois 

 Geological Reports and elsewhere. 



Genus Eileticus, nov. gen. (e^-nxd?.) 



Segments longer than in the other genera, being considerably less than twice as broad 

 as long, very few in number, and furnished in place of spines with a series of tubercles, of 

 which there are more than one in the same row upon a single segment. 



Although presenting at first glance a very different appearance from the types already 

 described, there seems to be no reason why it should be separated very widely from them ; 

 the spines are merely reduced to tubercles, and this reduction allows their nndtiplication 

 along any one line, especially when the segments are at the same time longer than com- 



