506 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



First Maxilla (fig. 4). — Only the endopodite of this 

 appendage is present, and that is a slight structure, 

 bearing a minute flagellum. The coxa and basis, which 

 almost make up the appendage, are membranous in 

 texture but edged with strong setae. 



Second Maxilla (fig. 5). — To this mouth-part is 

 attached the Scaphognathite, which represents a modified 

 exopodite. The endopod is a slender spike, partly 

 hidden by the large basis and coxa, which again 

 constitute the greater part of the appendage. Both are 

 unequally bi-lobed. 



The First Maxillipede (fig. 6) resembles the 

 Maxillae rather than the two following mouth-parts in 

 its general structure. The coxa and basis are still on 

 the inner side, but neither is divided. The rest of the 

 appendage is thin and membranous. The exopod is 

 minute and bears no flagellum ; the endopod is more 

 massive and has a fine setose flagellum. There is no 

 epipodite. 



The Second Maxillipede (fig. T). — This, and the 

 following appendage, are more or less typical in struc- 

 ture, possessing a seven- jointed endopod, and a 

 flagellated exopod. The exopod in Mxp. II is com- 

 paratively much larger than in Mxp. III. 



The Third Maxillipede (fig. 8). — The basi-ischio- 

 podite bears a row of powerful teeth, increasing in size 

 proximally. The degree of approximation of the two 

 Maxillipedes affords an important point in classification. 

 These two limbs take an active part in feeding. 



The First Pereiopod or Chela (figs. 9 and 10).— In the 

 present type the inequality in point of size of the Chelae 

 is very striking, the right member being half as long 

 again as its fellow. An exopod is absent, two joints, the 

 ischium and basis, are fused and the propos is prolonged 

 forwards to form with the dactylos the crushing edges. 



