

IN IDA. 



the expression polli thumb) for thi- process, though this latter name had already 



bricius and Kroyer of the last joint of the cheliforus, the movable finger. 

 Movable I i mobilise fig. 1 dm. 



ricius: pollex; Kroyer: Tommd (pollex); Hoek: griffe mobile des mandibules; 

 lus; Bohm: Scheerenfingei 01 Daumen; Hansen: [ndex; Sars: bevaegelige Finger 

 ■ 



I have kept the old name of O. Pabricius and Kroyer pollex or movable finger for the 

 inal joint of the cheliforus, or the movable finger of the hand, and can see no reason to intro- 

 I of it the dactylus of Wilson. 

 To avoid ever) misconception it would perhaps be best to omit the use of the short nam. 

 dactylus, index, and thumb, and to abide bj the appellations digitus immobilis and digitus 

 mobilis, immovable and movable finger, as I have done in the synoptical figure bj choosing the 

 letters dim and dm. 



Ambulatory lejj; (pes ambulator/its), fig. i pa and 2 



i in kewi tsch, Pantop. Vettor Pisani , gives to the first pair of ambulatory legs also the 

 separate name: Patte-machoire. 



The ri-c and development of the four pairs of ambulatory legs follow the larval development, 

 and they are never wanting in the imago, nor reduced in any way but at most by the defective devel- 

 opment or the falling off of the claws or the auxiliary claws. They arise from the ends of the lateral 

 processes of the both, and are, to judge from the rudiments in the embryo and the larva, as has been 

 mentioned, <>nly prolongations of these processes, constricted into the number of nine joints, inclusive 

 of the claw, which is common to all Pycnogonida. 



First coxal joint (articulus coxalis primus], fig. 1 <•'. 



and coxal joint (articulus coxalis secundus), fig. 1 c 2 . 

 Third coxal joint [articulus coxalis tertius), fig. I f3. 



; Hofteled (articuli coxales). 

 These three joints Eonn the proximal end of the ambulatory Ic.l;; they belong to the shortest 

 joints of the leg, and form a series "I homonomous joints, being of one set; therefore they may all 

 ther correctly be termed the coxa. 

 moral joint (femur), fig. 1 

 rs: I.aarlcd (articulus femoralis). 

 In the Arthropoda, especially the Insects, the femoral joint follows upon the coxa and coxal 

 banter, which in these animals is only a subordinate joint I think it, however, im- 

 the terminolog] of th< the Insects to those of the Pycnogonida, and tli 



I have red it advisable to follow Sars in his appellations of the joints of the leg, only 



with -Dine variation in the special nanus. 



st tibial joint [articulus tibialis prior), fig. 1 I/". 



tibial joint [articulus tibialis alter), Kg. 1 tb-. 

 (articuli bbiales). 

 Thi closely united, and there is no reason to give any prominence 



