BRUES: NEW SPECIES OF PERIPATUS. 



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lozenge-shaped pattern exhibited by some of the related species. On the 

 ventral side the color is much lighter and quite distinctly purplish pink. 

 The legs are intermediate in color between the upper and under sides of the 

 body. Above they are lighter than the dorsal surface of the body, but much 

 darker than their undersides which are in turn very decidedly darker than the 

 underside of the body. 



Integument. The dorsal folds are sharply defined and the transverse grooves 

 that separate them are deeply and clearly impressed. Between the furrows, 

 the surface of each fold is regularly but not very strongly convex. Along 

 the median line the number of folds is very uniform, twelve to each body 

 segment, but laterally, particularly halfway to the base of the legs, many of 

 the grooves coalesce. Near the middle body segments, there are on the 

 average about two cases of coalescence to a segment, so that the folds are 

 quite appreciably wider on the half of each side of the body which is next to 

 the insertion of the legs. The dorsal median hyaline line is sharply defined, 

 but is very much more distinct upon every second transverse fold, the alter- 

 nating folds having only a very slight indication of it, either by reflected or by 

 transmitted light. The hyaline organs (organes clairs) are not at all, or very 

 feebly defined. 



The primary papillae are confined almost entirely to the ridges of the folds, 

 although they do not form a straight line except in very rare cases. Usually 

 they form an irregular line which is quite clearly distinguishable from the 

 smaller papillae along the slopes of the fold, but exceptionally, some of the 

 larger papillae descend a considerable distance from the ridges. The slopes 

 of the folds are furnished with the smaller papillae, many of which ascend 

 on to the ridges between the largest ones. The large, medium sized and small 

 papillae intergrade completely, so that it is impossible to distinguish between 

 primary and accessory ones. 

 In most cases, however, there 

 are about three, more rarely 

 two or one, smaller papillae 

 between two especially large 

 ones along the ridges of the 

 folds. The papillae are all of 

 approximately the same form, 

 with well-developed conical 

 bases and greatly reduced, 

 scarcely evident cylindroid 

 apices. The hyaline streaks 

 in the integument separating 

 the bases of the papillae are 

 very sharply defined and form 

 an extremely irregular net- 

 work which encloses areas of 

 all shapes and sizes, most of them plainly polygonal in form. 



Mandibles. The external blade of the mandibles bears two accessory teeth, 



Fig. 1. — Peripatus barbouri, sp. nov. Outer 

 blade of mandible showing denticles, and outer 

 portion of inner blade. 



