1887.] ON CYCLESTHERIA HISLOPI. 63 



Fig. 5. Cephalic part, from left side: oc ocellus; g cerebral gang- 

 lion; a 1 antennula; a 2 place where the left antenna is 

 inserted; L labrum; M mandible ; m l maxilla of first pair' 

 ni 2 maxilla of second pair; x rudimentary ,.affixing organ"; 

 J intestine. 



Fig. 6. Outer part of an antennula, more highly magnified. 



Plate IV. 



Fig. 1. Kight antenna; from inner side, magnified 50 diameters. 

 Fig. 2. Right mandible; from inner side, magnified 78 diameters. 

 Fig. 3. Same from anterior side. 



Fig. 4. Oral parts on left side posterior to the mandibles, from 

 below: x left lobe of posterior lip (?); rn, 1 maxilla of 

 first pair; m 2 maxilla of second pair. 



Fig. 5. Maxilla of first pair, together with right lobe of post- 

 erior lip (x), magnified 98 diameters. 



Fig. 6. Maxilla of second pair. 



Fig. 7. Left leg of first pair; from outer side, magnified 50 

 diameters. 



Fig. 8. Same leg expanded, from posterior side. 



Plate V. 



Fig. 1. Left leg of second pair; from posterior side, magnified 

 50 diameters. 



Fig. 2. Eight leg of seventh pair, from anterior side: c cirrus. 

 Fig. 3. Coxal lobe, or maxillar process of a leg; from anterior 



side, more highly magnified. 

 Fig. 4. Leg of last pair. 



Fig. 5. Caudal plate, together with part of trunk, from right 

 side: p u leg of last pair. 



Plate VI. 



Development of the Summer-eggs. 

 Fig. 1. An egg, shortly after its deposit in the incubatory cavity, 

 affixed to the cirrus-like prolongation of the exopodite 

 of one of the legs, magnified 78 diameters: ex upper 

 expanded part of exopodite; p cirrus; ch outer egg-mem- 



