180 



MR. R. I. POCOCK ON THE 



Text-fig. 43. 



Thh. 



[June 17, 



c4m. '^^•Z'- 



Mouth -parts of the Scovpioiies and of the Araneie of the family Lycnsulee. 



A. Dorsal view of the mouth-parts, of a Scorpion (Falamncevs), with the chelicerK 



removed: ent., crescentic ento.sclerite supporting the lateral dilator muscles 

 of the pharynx {ph.) ; cam., camarostome ; II, coxa of second appendage or 

 chela, with mh., hairy membranous tract, and ff, entapophysial groove ; 

 tr., trochanter or second segment of chela ; III and IV, sternc-coxal or 

 maxillary processes of thii'd and fourth appendages (first and second walking- 

 legs) forming the suboral trough. 



B. Lateral view of the mouth-parts of a Scorpion (Palamncens), the chela, chelicera, 



and anterior portion of the prosoma of the left side removed : car., cut edge 

 of middle line of carapace ; ins., vertical muscle passing from carapace to the 

 crescentic entosclerite (enf.) ; I, appendage of first pair, orchelicera ; m., mouth 

 leading into pharj'nx or pre-cerebral sucker (ph.); .s^', anterior portion ot 

 sternal area of prosoma, which is normally concealed by the coxa and sterno- 

 coxal process of the appendage of the fourth pair (IV), forming the suboral 

 trough; St.", posterior or exposed part of the sternal area forming the 

 pentagonal metasternite. 



C. Dorsal view of the mouth-parts of a Spider {Lycosa ingens), with chelicera; 



removed, showing the camarostome {cam.) flanked on each side by the large 

 maxillary process {mx.p.) of the coxa of the second appendage or palpus : 

 cl., basal sclerite {clypeiis) of camarostome, which is united with the adjacent 

 area of the coxa as tar as the point p ; c), entapophysial groove of coxa lying 

 transversely, not longitudinally as in the Scorpiones, Pedipalpi, and Pseudo- 

 scorpiones. 



D. Lateral view of the same, with the same lettering as in C, with m., mouth leading 



into pharj'nx or pre-cerebral sucker {ph.) : lab., labium or sternal plate of 

 first postoral somite forming the suboi'al trough ; st., anterior portion 

 of median sternal sclerite. 



