25 



of the apophysis is attached to the metastoma by means 

 of a somewhat flexible membrane. 



The First Maxilla (PL II, fig. 7, PL IV, fig. 26), which 

 arises immediately behind the mandible, is small and is 

 made up of a protopodite and endopodite. The exopodite 

 is absent. The protopodite is on the inner side and is 

 composed of two distinct pieces a narrow proximal 

 coxopodite (C.) and a larger basipodite (/?.) which is 

 external to the coxopodite. The endopodite (end.} arises 

 from the outer side of the basipodite, and consists of a 

 broad proximal leaf-like region and a narrower distal 

 region. From the distal extremity of both parts of the 

 protopodite arise fairly strong setae. 



The Second Maxilla (PL II, fig. 8, PL IV, fig. 27) 

 consists of an inner protopodite, a median endopodite 

 (end.} and an outer exopodite (Scaph.}. The protopodite 

 is composed of a coxopodite (C.} and a basipodite (/?.), 

 each of which is bilobed. The two lobes of the coxopodite 

 are long and slender, and are clearly separated from one 

 another. Those of the basipodite are broader, and the 

 separation between the two lobes is only partial. On the 

 outer side of the basipodite is the small endopodite, which 

 ends in a long narrow process. On the outer side of the 

 endopodite and arising from the basipodite, is the large 

 modified exopodite which is known as the scaphog.nathite 

 (Scaph.}. This is a broad plate of irregular shape which 

 lies in the pre-branchial chamber. By means of its rapid 

 and complicated movement it bales the water out of the 

 branchial chamber. 



In the First Maxillipede (PL II, fig. 9) the protopodite 

 is on the inner side. The coxopodite (C.) is small and 

 richly clothed with setae, and the basipodite (B.} is a long 

 lamella having two rows ot setae on its outer edge. The 

 endopodite (end.} is between the exopodite and the proto- 



