38 ME. M. LATJEIE ON THE 



of whicli is unknown. An epicoxite is present in appendages 

 iii.-v. 



(c) Scorpions. — The masticatory function has been lost, except 

 in appendage ii., though the expanded first joint persists in iii. 

 and iv., and serves to shut in the mouth behind. An epicoxite 

 is present in iii. * The third segment has an ascending position, 

 the fourth is almost horizontal. The articulation between 5 and 

 6 is modified for antero-posterior motion. 



Fedipalpi. — The masticatory function is retained in appendage 

 ii. in Phrynus, but not in Theli/plionus, in which the first joints 

 of this limb are fused and perform the function of appendages iii. 

 and iv. of the Scorpion. Appendage iii. is modified as a tactile 

 organ, the last four joints in Plirynus and the last three in TheJy- 

 plionus being secondarily segmented. The first segment of 

 appendages iv.-vi. is fused to the body — more completely in 

 Thelyijhonus than in IBTirynus. Segment 3 is ascending in direc- 

 tion in these limbs, and the rest descending. Articulation 4-5 

 is modified for antero-posterior motion, and segment 7 foi-ms a 

 three-jointed tarsus. Appendage vi. in the Phrynidse undergoes 

 secondary segmentation of segment 5 in many forms. FTirytiichus 

 (ceylonicus) has the segment normal ; Damon {medius) has it 

 divided into two ; Tarantula pumilis (C. L. Koch) has three 

 segments in this region, and Phrynus Grayi (?) four f. 



Araneidcd. — These are similar in arrangement to the Pedipalpi, 

 except that segment 7 is not divided up into a tarsus. Appendage 

 ii. is tactile, not prehensile, and undergoes curious modifications 

 in the male. 



Phalangidce. — The masticatory function is retained by append- 

 ages ii. and iii., while appendage iv. has still a process projecting 

 towards the middle line. The rest of the limbs are similar to 

 those of Spiders, except that segment 7 is divided into a many- 

 jointed tarsus. 



Galeodes. — The masticatory function is entirely lost. Ap- 

 pendage iii. is slightly modified for tactile purposes, having 

 practically lost the claw and apparently segment 7. This loss of 

 a segment is curiously in contrast with the multiplication of 

 segments in the corresponding limb of the Pedipalpi. In append- 

 ages iii. and iv. an additional joint is intercalated between 

 segments 2 and 3. This may be due to division of segment 2, 

 * Lankester, Q. J. M. S. xxi. 

 t Karsch, " Zur Kenntniss der Tarantuliden," Arch. f. Naturg. vol. i. 



