176 MR. R. I. POCOCK ON THE [June 17, 



approximated in the middle line, in simiilation of the position 

 those of Thelyphonus have pei'manently assumed, the coxa^ of 

 Phrymts f oi-m a long channel, oi- guttei', open above and extending 

 from theii- distal exti'emities backwards to tlie mouth. The sides 

 of this channel ai-e beset with longish haii'S over the greater pait of 

 their extent (text-fig. 42, A, B, mb., p. 1 77) ; but proximally on each 

 side there is a sharply defined, elongate, pubescent area, which 

 fuses with its fellow of the opposite side immediately below the 

 mouth, and stretches a considei'able distance foi-wards in advance 

 of it. Stripped of its pubescence, this ai'ea is seen to consist of a 

 horny thickening of the integument (text-fig. 42, A, B, lam., p. 177). 

 If the coxse were to fuse in the middle line, the union of these 

 chitinous areas would foi-m a horny plate similar to that of 

 Thelyphomis, and the enlargement of the camarostome and the 

 fusion of its basal sclerite with the coxa? would reproduce the 

 state of things now found in the last-named genus. 



Beiiiai'd's account and figui-es of the mouth of Thelyplionvs I 

 cannot reconcile with the facts just desciibed. In his paper on 

 the morphology of the Galeodidpe' (p. ;557) he says : " Thelyphomis 

 also [i. e. as well as Galeode.s\ has a beak, l)ut it is enclosed between 

 the basal joints of the pedipalps, which aie fused below it but are 

 open above it. The chelicera? crush the pi-ey into the channel 

 thus foiined by the coxfe of the pedipalps, and the juices are 

 drawn in b}' the powerful pumping ajiparatus. They are sti-ained 

 by transvei'se rows of fine hairs, which line the aperture." And 



in the preceding page he says: "We find the pumping 



apparatus contained in a beak in such widel}' different groups as 

 Gcdeodes, Thdypjhonus, and Gamasus." 



From this it might be inferred that Thelyphonus has a beak 

 I'esembling that of Gcdeodes, but with its infeiior suiface fused 

 to the subjacent area of the trough-like hollow foimed by the 

 fused inner (preaxial) suifaces of the chelfe (pedipalps). And 

 the three figures representing transverse sections of the V)uccal 

 region bear out this interpretation. The first section, taken 

 neai' the extremity of the camarostome, and the second pi'obably 

 near its middle, cleai'ly show the crescentic slit-like hair-lined 

 entrance to the alimentary canal which Bernard regards as the 

 oral apertui'e. But the two upwardly directed extremities of this 

 canal are represented as closed above. Moreover, these two 

 figvires show the coxal cavities of the right and left sides separated 

 from each other by a median vertical partition extending to the 

 floor of the space in which the ' rostrum ' rests. I have not found 

 this partition in any adult Thelyphomis. ISTo doubt it was present 

 in the yoiing and in the parent form of the race. Its persistence 

 in the adult as the thick horny I'od depicted in Bernard's drawings 

 would considerably interfere with the movements the coxaj joeiform 

 to compress the camarostome. The third section, passing appa- 

 rently through the camarostome a short distance in front of the 



1 "Comparative Morphology of the Galeodidas," Trans. Linn. Soc. ser. 2, Zool. vi. 

 pp. 305-417. 



