162 . S. H. SCUDDER ON SPINED MYRIAPODS 



further side their bases may not show, in which case they are longer ; they are tapering 

 and sharply pointed and bear anteriorly, not far before the tip, a small, delicate, pointed 

 spinule ; they are represented on every segment but the last. The legs which the text 

 describes (for all the specimens) as five-jointed are three- or four-jointed in all figured, the 

 joints of equal length, the whole leg moderately stout, tapering, and slightly longer than 

 the width of the body. Similar circular holes are shown above the bases of the legs on 

 each of the ventral plates, as in the last specimen mentioned, and like them probably 

 represent the bases of the nearer pair of legs, all of which are wanting. 



This specimen differs from the last mentioned in the greater length of the dorsal plates, 

 and in a more conspicuous tapering of the body posteriorly on a similar view ; but it prob- 

 ably should be considered as of the same species. 



The third specimen which I would refer here is one which I have received from Mr. 

 Carr, and first saw through the kindness of Mr. Pike (PL 12, fig. 1). It lies flat upon its 

 back, with the lateral spines projecting equally on either side ; a fragment on a higher 

 level at one side shows a few legs, proving that we have here the inner view of the dorsal 

 plates. It is nearly straight and nearly or quite complete. It has the appearance of being 

 unnaturally flattened so as to preserve slight indication of its probably nearly cylindrical 

 form, but its position gives the best view of the form of the animal ; it is largest at the 

 end of the first third of the body or from the twelfth to the eighteenth segments ; in 

 front of this it tapers very gradually and regularly, so as to be about one fifth smaller just 

 behind the head, while the head itself, as in the first specimen mentioned, is again broader ; 

 posteriorly it gradually tapers more until the hinder fourth is reached ; this is of nearly 

 uniform width and a little less than one-third smaller than the broadest part ; in the form 

 of the front of the body therefore it more nearly resembles the first specimen mentioned 

 (D, fig. 6, supra), while in that of the posterior extremity it is like the second specimen 

 (C, fig. 7, supra) ; the length of the animal is 105 mm. 



As to the head (PL 12, fig. 3), it is rounded in front and very short, being much 

 shorter than the body segments and as broad as they, but even broader than those 

 nearest to it ; it bears posteriorly a narrow, prominent, transverse ridge which appears 

 to bear on the left side the scar of a subdorsal spine, but situated, like that of the 

 next segment, far toward the side of the body ; something which looks like a spine, but 

 which may be an antenna, projects forward and outward from the outer front angle of the 

 head ; it is straight, tapering, rather regular and bluntly pointed, as long as the depth of 

 the head ; no joints can be seen in it. The segment immediately behind the head is very 

 pinched, not half so long as the head, and bears lateral as well as subdorsal spines ; the 

 lateral spine is not represented on the enlarged drawing of this part. The other segments 

 are similar to one another and number thirty-seven, including all but the head ; prob- 

 ably they include the whole animal, although the hinder edge of the creature is broken, and 

 there may be one or two more segments ; this number it will be noticed agrees very closely 

 with that of the first perfect specimen mentioned. The average length of the body segments 

 is nearly 3 mm. while the average breadth is about 5.5 nun., the segments being about 

 twice as broad as long, in which it agrees again very well with the other specimens 

 described ; this proportion holds well throughout the body, the broadest segments measur- 

 ing about 7 mm. and their length about 3.5 mm. ; while at the tail where the width is 4 nun. 



