1911.] NATURAL SCIENCES OF PHILADELPHIA. 383 



ventral surface of the palps and legs single isolated slits occur only 

 on the sixth joint of the left palp (figs. 13c, 34a); on the femur of the 

 first and second legs (figs. 13m, 37a), and on the tibia of the third leg 

 (fig. 14). On the dorsal surface of both the palps and legs the single 

 slits are much more numerous and are arranged more or less in regular 

 rows. Thus we see several on the sixth and fifth joints of the palps 

 (figs. 14/, 346). On the legs they occur as follows — a row on each 

 femur (figs. 13, 14», 376); three or four irregularly scattered on the 

 patella of the third and fourth legs (fig. 13); on the tibia of the first, 

 second and fourth legs a row (figs. 13, 14/, 34c); only two on each 

 of the metatarsi of the first, third and fourth legs (figs. 13, 14). Most 

 all of these are parallel with the axis of the leg. On either the dorsal 

 or anterior surface of the trochanter of the second, third and some- 

 times the fourth leg, there are two or more isolated single slits 

 (fig. 14). 



Organs No. 14 and 15 lie on the outer edge of the ventral side at 

 the distal end of the chelicera. They are always paired and form a 

 right angle with each other (fig. 13). Organ No. 14 (fig. 51a) is the 

 larger and lies near the outer edge. Each organ has four slits, each 

 of which has its own border. All of these borders are more or less 

 connected with each other. Likewise organs No. 16 and 17 are 

 paired, but are located on the outer edge of the dorsal surface at the 

 distal end of the chelicera (fig. 14). No. 16, the larger (fig. 55a), lies 

 the nearer the outer edge. It always has an associated single slit 

 (fig. 55c). Each organ has six slits whose borders are similar to those 

 of Nos. 14 and 15. ( )n both the dorsal and ventral surfaces of the 

 chelicera several small isolated slits lie along the outer edges (figs. 

 13,a, 14, 50). 



Organ No. IS is one of the paired structures found on the dorsal sur- 

 face of the pedicle near the distal end. Each organ lies near the outer 

 edge and has transverse slits, but the longer axis of the organ lies 

 almost parallel with the axis of the pedicle. The diameter of the slits 

 is very great and each slit has its own border, but all these borders 

 are joined at their sides while the ends are free and do not pass around 

 the ends of the slits as usual, but connect with these ends (figs. 13, 

 41). 



Several scattered slits lie near the outer edges of the maxilla? (figs. 

 136, 39). Thirty-eight isolated slits of irregular sizes are found on 

 the sternum arranged in a Y-shaped figure with the apex of the V at 

 the distal end of the sternal plate. Each row, which is composed 

 of three or four groups more or less irregularly arranged and which 



