294 S. H. SCUDDER ON NEW TYPES 



Four specimens of this species have been examined, two of them belonging formerly to 

 Mr. J. C. Carr, of Morris, 111., and received for study from him, but now in the collection of 

 Mr. R. D. Lacoe, of Pittston, Penn. ; a third received from Mr. Lacoe and numbered 1851 

 in his collection ; the fourth obtained by Mr. F. T. Bliss, of Morris, 111., and in my own 

 collection ; all of these are admirably preserved and show both relief and counterpart. 

 Both of Mr. Carr's specimens are preserved from above and have the fascicles spread 

 regularly upon either side of the body. In one (pi. 26, fig. 7), which has the head end as 

 well as the opposite completely fringed with spines, the general cursory resemblance of 

 the whole to the caterpillar of an Arctian is very striking. The rods of the fascicles of the 

 first and second body segments and especially of the first are considerably shorter than 

 those of the succeeding segments, those of the first projecting forward over and concealing 

 the head ; in the same way those of the last segment make a complete fringe around the 

 posterior extremity of the body. The fascicles are more readily seen on this than on the 

 other specimens to emanate from tubercles, which are conical and apparently (here at 

 least) higher than their basal breadth. The fascicles are longer than the width of the 

 body, and their most divergent rods are about at right angles to each other. The length 

 of the body in this specimen is 33 mm. ; or, with the rods, 40.5 mm. ; the width of the body 

 is o.b mm. ; or, with the rods, 17 mm. The longest rods are 6.5 mm. long. 



The second specimen of Mr. Carr's collection (pi. 26, fig. 6) is about the same size as the 

 last, the body measuring 31 mm. by 5 mm. ; or with the rods 40.5 mm. by 15 mm. The 

 rods in the fascicles are, however, considerably less divergent and trend a little backward 

 giving them a more bunchy appearance; those of opposite side-; of the same fascicle rarely 

 diverge more than 55 ; the rods themselves appear here to be usually a little longer than 

 in the first specimen though the longest are of the same length, and to be seated on tuber- 

 cles which are stouter and less elevated, but this may be merely an appearance due to the 

 way in which the specimen is preserved. The relation of the rods of the first and second 

 body segments, and of the last segment to the others so far as their size and distribution 

 is concerned, is the same as in the previous specimen ; but those of the anterior segments 

 are not directed forward, but on the first segment backward and on the second laterally so 

 as to leave the head nearly uncovered. This appears as a rather small, transversely oval, 

 rounded mass, about twice as broad as long, and only about half as broad as the body; 

 neither eyes nor antennae can be made out. 



The specimen obtained by Mr. Bliss (pi. 26, fig. 8) is slightly smaller than the others, 

 preserved on a side view, and arcuate instead of straight. If extended, the length of the / 

 body would be 33.5 mm. and its height 1.5 mm. ; or, including in the height both spines 

 and legs, 13.5 mm. 



The rods in the fascicles are even less divergent than in the last mentioned specimen, 

 rarely exceeding 40° between opposite rods of the same fascicle (pi. 26, figs. 5, 'J). There is 

 also less indication here of any tubercles at the base of the fascicles, and those of the first 

 and second segments although shorter than the others are not noticeably so, and the first 

 are very nearly as long as the second ; the longest spines are about 6 mm. long. In this 

 side view the head again appears, not separated by any sharp line of demarcation from the 

 segment behind, but considerably smaller than the body, higher than long, r-ather flattened 

 in front, and with an inferior basal projection of a conical form ; no eyes nor appendages 



