530 _ 
Fic. 
Fic. 
PROFESSOR E, RAY LANKESTER, 
8 (A).—Ventral aspect of a scorpion (Buthus Kochit), with the terminal 
segments omitted. Drawn from the object. 1 to v1. The cephalo- 
thoracic appendages. 11. Points to the sterno-coxal process of the 
great chele, wr. To the sterno-coxal process of the first walking 
leg. Iv. To the sterno-coxal process of the second walking leg. 
met. Thoracic metasternite. vil go. The genital operculum. vut p. 
The pectines, or eighth pair of appendages. z. Sternite of the eighth 
segment. IX stg, x stg, X1 stg, x11 stg. Stigmata leading into the 
pulmonary sacs, containing the appendages of the ninth, tenth, eleventh, 
and twelfth segments. y. Sternite of the thirteenth segment devoid 
of appendages. m. Mouth, in front of which is seen the camero- 
stome. 
9 (8).— Ventral aspect of a bird’s nest spider (Mygale sp), the hairs 
removed. Drawn from the object. 1 to vi. Cephalothoracic appen- 
dages. mM. Mouth, in front of which is seen the camerostome. pro. 
Thoracic prosternite. mes. Thoracic mesosternite. s¢g. The apertures 
of the two pulmonary sacs of the left side. gz. Genital aperture. 
an. Anus. 
obliterated. A similar obliteration has taken place in Galeodes 
(fig. 10), but in Thelyphonus (fig. 12), a triangular sternite 
(st¢’) is found (though erroneously omitted in the figure given 
in the last edition of Cuvier’s ‘ Regne Animal’) in front of the 
coxe of the fourth pair of cephalothoracic appendages. 
The Arachnids, which come nearest to Limulus in the 
