492 O. W. HYMAN 



The mandible is short, stout, and iinsegmented. Its edge has 

 the usual teeth for tearing and grinding. The first maxilla (fig. 

 45) is bisegmented. The basal segment is bilobed and thickly 

 lamelliform. The medial lobe bears one movable smooth spine 

 on its median border, and, at its tip, three macerating spines. 

 The lateral lobe bears similar spines arranged in two series. 

 From the distal border of the lobe arise two or three strong 

 spines, and from its inner face, near the border, arise three weaker 

 spines. The distal segment is cylindrical and bears four tactile 

 hairs at its tip. 



The second maxilla (figure 54) is a lamellar appendage, its 

 median border produced into four lobes and a hairy process ex- 

 tending laterally. The three median lobes represent the basal seg- 

 ment or segments. Of these, the most median bears two series 

 of smooth spines. The middle and lateral lobes of the basal seg- 

 ment are each armed with three macerating spines at their tip 

 and one on their inner surface near the tip. The fourth lobe rep- 

 resents the distal segment. It bears three tactile hairs at its tip. 

 The outer plate represents the epipodite. It consists of a proxi- 

 mal lamelliform portion which bears four finely plumose hairs 

 along its lateral border, and is produced posteriorly into a proc- 

 ess which tapers to a blunt end. The process is covered with 

 fine hairs over most of its suface. 



The first maxiUiped (fig. 62) is the best developed of the ap- 

 pendages at this time. It is 0.25 mm. long without its terminal 

 hairs. It is composed of a basal portion, an endopodite, and 

 exopodite. The basal portion is unsegmented, compressed, and 

 of approximately uniform circumference. The endopodite, slen- 

 der and slightly longer than the basal portion, is composed of 

 five segments. The terminal segment bears three tactile hairs at 

 its tip and a single plmnose seta from its median superior surface. 

 The exopodite is unsegmented, cylindrical, and about equal in 

 length to the endopodite. It bears four long plumose hairs which 

 are jointed near their middle. The length of the hairs is from 

 0.16 to 0.20 mm. 



The second maxiUiped (fig. 62) is like the first in all respects ex- 

 cept its endopodite. This is much shorter and is trisegmented. 



