PLATE E. 



Fig. 1. Alona quadrangular is, female. 



A. anteunule. Lb. labrum. Md. mandible. P-a. post- 

 abdomeu. Au. anus. F, c. musculus flexor caudalis. 

 E. c. musculus extensor caudalis. A. g. anal gland, 

 n. g. nutritive globule in embryo, t. tail of embryo. 

 I, II, III, IV, V. five pairs of feet of embryo, mx. maxilla 

 of embryo, at^. antennae of embryo, at^ antennules 

 of embryo. H. heart. Sh. g. shell gland. Ov. ovary. 

 Md. m. muscle of mandible. At.^m. muscle of antennae. 

 E. eye, s. ce. g. supra-cesophagal ganglion. P. F. pig- 

 ment fleck. 



brain, eye and pigment fleck of same. 

 Pleuroxus procurvus, female, 

 foot of same. 

 Acroperus leucocephalus. 

 Alonella excisa, female; 6a. shell of same, 

 antennae of same. 

 Alonopsis latissima, female. 

 Alonopsis media, female. 

 Camptocercus macrurus, post-abdomen, 

 lower angle of shell of same. 



