Alona quadrangularis. 
FIG. 
1. Female. <A?., antennule; Lb., labrum; Md., mandible; P-a., post 
abdomen; An.,anus; F. ¢., musculus flexor caudalis; E. ¢., mus- 
culus extensor caudalis; A. g., anal gland; n. gl., nutritive 
globule in embryo; t., tail of embryo; I, I, III, IV, V, five 
pairs of feet of embryo; mx., maxilla of embryo; at?., antenne 
of embryo; at!., antennules of embryo; H., heart; sh. g., shell 
gland; ov., ovary; Md. m., muscle of mandible; At”. m., muscle 
of antenna; E., eye; Sce. g., supra-cesophageal ganglion; P. f., 
pigment fleck. 
2. Brain, eye and pigment fleck of same. 
Pleuroxus procurvus. 
3. Female. 
4. Foot of same. 
5. Acroperus leucocephalus. 
Alonella excisa. 
6. Female. 
6a. Shell of same. 
7. Antenna of same. 
8. Alonopsis latissima. Female. 
9. ef latissima var. media. Female. 
Camptocercus macrurus. 
10. Post-abdomen. 
10a. Lower angle of shell of same. 
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