TIIK MVIvlAINil^A l\ I'lll': Al'STK-AlJAN MUSKIIM liK()l,KM ANN. 115 



fill lowing- legs loiirritudinally grooved below. Tai-si not 

 |)ii(l(le(l. Seventh .segment swollen ventrad, but wiiliout i-aised 



inarLj'ili. 



Copulatofy ap])endag'es (PI. xv., fig's 27, 28) : — Tlie ventral 

 [ilnte of the antevior gonopods (V.) appears on the antei'ior 

 surface, as a transverse arched band, the ends of which are 

 curled back and expand around the basis of tlie posterior sui'- 

 face of the organ ; the centre of the band is produced into a 

 narrow, almost parallel sided plate, with moderately swollen 

 l)ase, tipped with a sub-triangular piece, the angles of which 

 ;ife rounded ; on the posterior surface the ends of the band 

 meet the tracheal stalk (fs.) which are angularly directed up- 

 wards and ill wards ; the tracheal stalks are bent at right angles, 

 not unlike a pickaxe, their upper angles leaning against the in- 

 ner angle of the femur as well as against the middle of the 

 base of the tibia. The distal process of the coxa is slender, 

 digitiform, somewhat longer than the ventral plate ; no 

 endoskeletic process exists proximally. The femur (Fern.) is a 

 broad, triangular, globular plate, sitting partly on the curled 

 exjiansion of the ventral plate, partly on the outer branch of 

 the tracheal stalk ; its outer edge is fused as usual with the 

 coxal expansion ; its distal edge is emarginate. The tibia (T.) 

 is a conspicuously developed triangular piece, the base of which 

 is very broad ; it articulates with the distal edge of the femur 

 on its outer half only, the inner half remaining free. The dis- 

 tal plate of the tibia is considerably enlarged so as to conceal 

 the largest part of the tibia; it extends far beyond the ventral 

 plate and the coxal process ; its outer margin is sinute and its 

 apex rounded. 



Posterior gonopods (PI. xv., fig. 29) composed of two joints 

 placed at right angles. The basal joints of both gonopods are 

 connected by an elastic bridge, the rigid ends of which hem 

 inwardly the basal joints of the gonopods and meet the long 

 and slender tracheal stalk. The basal joint shelters the usual 

 bladder-like swelling (d.) of the seminal duct and its strongly 

 t\visted proximal part. The distal joint is elongate and con- 

 stricted in the middle, where traces of an articulation may be 

 seen along the outer edge (x.) ; the proxi«ial half is gradually 

 tapei^ing from the base, and shows a rounded swelling along 

 its inner edge ; the distal half is formed of two parallel 

 lamella3 the sliape of which will be seen in PI. xv., fig. 29. 



