14 B. H. BUXTON 



V. PEDIPALPS 



Amhlypygi 



The ganglia are all concentrated in the cephalothorax, the 

 suboesophageal ganghon containing seventeen neuromeres. The 

 photograph is taken from the only section I have which shows 

 the whole of the neiu'omeres in one field, but in a large number 

 of specimens it has been found easy to detect the whole seven- 

 teen by making a composite drawing from several sections in 

 series. The Tarantulini Phrynini and Charontini are precisely 

 shnilar as regards this arrangement of the ganglia (figs. 3 and 4) . 



Uropygi 



Thelyphonides. Both in young and adult specimens the sub- 

 oesophageal ganglion contains only twelve neuromeres, but at 

 the posterior end of the abdomen there is a large additional 

 ganglion with five neuromeres, representing the last five abdom- 

 inal segments. 



The eggs of Thelyphonus (linganus, the species studied) are 

 carried in a packet attached to the underside of the abdomen of 

 the mother. Just after hatching out, the larvae, white and 

 inert, are carried wrapped around the body of the mother to 

 which they are firmly attached by a gummy substance. At this 

 stage the suboesophageal ganglion consists of nine neuromeres; 

 the other eight ganglia being paired and strung out separately 

 along the abdomen. In a few days, however, and before the 

 next moult, the ganglia have become concentrated; the three 

 anterior pairs becoming fused in the median line and passing for- 

 ward to join the suboesophageal ganglion, while the five pos- 

 terior pairs also fuse in the median line and with each other to 

 form the abdominal ganglion as in the more mature animals. 

 Strubell ('92), for Thelyphonus Caudatus, described six pairs 

 of ganglia in the cephalothorax and ten pairs in the abdomen — 

 his specimens probably representing a slightly earlier stage than 

 I had an opportunity of observing; but there are certainly sev- 

 enteen ganglia altogether, and not sixteen as he described. 



