REPORT OF THE STATE PALEONTOLOGIST 1902 109."") 



the natural position extend beyond the anterior margin of the 

 shield for about one third their length. The pincers articulate 

 with this joint in such a way that, when folded backward, they 

 cross it obliquely, and their tips converge a little in front of the 

 mouth; when extended forward, they diverge somewhat. The 

 preoral appendages could also be turned back to their full length 

 over the mouth, the pincer tips then overlapping the metas- 

 toma [pi. 11, fig. 6]. In an individual having a cephalothorax 

 22 mm long, the preoral appendages are 10 mm long. (Plate 9, 

 figure 1, shows these organs from the dorsal view, the cephalo- 

 thorax having been removed.) 



The four pairs of endognathites, or crawling legs, do not differ 

 materially from one another except in length. The anterior 

 limbs are somewhat shorter than the extended preoral ap- 

 pendages, and their tips extend but very little beyond the margin 

 of the shield. Each succeeding pair is about one half longer 

 than the preceding, so that the last limbs are probably four 

 times as long as the first. All have seven joints, of which the 

 terminal is spiniform. The third to the sixth joints inclusive 

 carry ventrally and at the distal ends a pair of striated, slightly 

 curved, slender spines. The inner spine of each pair is the 

 longer, and the length increases for each successive set, from 

 the third to the fifth joints; the spines on the sixth are short. 

 The coxal joints are elongate, slightly curved, widest at the 

 base and equal in length to the succeeding two joints. They 

 increase in length with each successive pair, and bear on the 

 inner end a series of 15 or more, sharp, curved teeth, which de- 

 crease in size from the front. On each of the fourth coxal 

 joints is a large perforation of the upper side near the fixed 

 end [pi. 26, fig. 5]. No epicoxite has yet been observed. The 

 second joint of the endognat&ite is divided by constrictions into 

 three transverse sections. It is articulated at the fixed end of 

 the coxal joint and is fully two thirds as wide. 



The limbs of the sixth pair are narrow and paddlelike, and con- 

 sist of eight joints and a rudimentary ninth or claw, the seventh 

 and eighth forming a slightly expanded blade. The seventh car- 

 ries a large, subtriangular, lobelike plate, nearly one half as 



