1882. 



65 [Scudder, 



graceful champagne-glass shape, broader than long, broadest apically, 

 the terminal joint hemispherical, the rounded portion apical. Excepting 

 the last three or four, the joints are deeply imbricate, and each bears 

 around the tip a series of distant, exceedingly minute, scarcely visible and 

 very short hairs, about one fourth as long as the joint. 



The head (fig. 4), drawn from the specimen after an accident had 

 crushed it and spread abnormally the front part of the head, is rounded 

 subquadrate with no superior stemmata. The median Fig. 4. 



suture is broken in the middle, the broken ends enlarg- 

 ing as if for the passage of a canal, and on the opposite 

 sides of the head there is a similar break in the contour 

 of the outer surface, which I have taken as probable 

 indications of stigmata. The mandibles, as in Muhr's 

 figure of his S. microcolpa, are broad serrated plates, 

 the serrations, as there, naturally falling into an equal 

 anterior and posterior series. But the maxillae appea r 

 very different, being slightly curved, finely pointed falca- 

 tions with no appendages. There is also exposed 

 between the unnaturally expanded mandibles and max- Fig. 5. 



illae the oral beak, as it might be called, the reniform mouth being pro- 

 truded at the summit of a conical extension of this part of the head, mch 

 as in Podura and recalling in a very modified manner the probable struc- 

 ture of the strange genus Lipocephalns from the Tertiary shales of Florissant, 

 Colorado. On either side of the walls of this conical projection are a cou- 

 ple of triangular folds or plates, which may represent the labium but which 

 are altogether different from Muhr's representation of S. microcolpa. 



The body is stout, very delicately shagreened, the joints perfectly simple, 

 without any imbrication or angular prolongation of the sides of the dorsal 

 plates. There are seven abdominal joints each with a pair of legs, and the last 

 bearing also a pair of stout conical anal appendages as large and as long 

 as the legs before their apical joint. There are no hairs upon the body, 

 but a few widely scattered minute papillae on the anal appendages, which 

 look as if they were meant for hair-bases. 



The supposed tracheal openings of the head, and the protrusion of the oral 

 parts are additional marks of affinity which S olopendrella bears to Thy* 

 sanura, where, following Dr. Packard, the speaker was inclined to place them. 



The movements of the living Scolopendrella, notwithstanding the modi- 

 fications one would look for in a polypodous creature, at once remind one of 

 the Thysanura, and especially of the Cinura, in their spasmodic character; 

 these creatures run a short distance, perhaps several times their length, 

 stop for a moment or two, and then dart off at an angle to repeat the 

 movement again and again. 



The length of the specimen studied is 3 mm. 



PROCEEDINGS B, S. K. H. VOL. XXII. 5 MAROH, 188$. 



