Alona quadraugnlaris. 



Fig. 



1. Female. A^.. antennule; Lb., labrum; Md., mandible; Pa,, post 



abdomen; An.,anus;F. c, m iiscul us flexor caudalis;E. c.,mus- 

 culus extensor caudalis; A. g., anal gland; n. gl., nutritive 

 globule in embryo; t., tail of embryo; I, II, III, IV, V, five 

 pairsof feet of embryo; mx., maxilla of embryo; at^., antennae 

 of embryo; at^., antennules of embryo; H., heart; sh. g., shell 

 glaud;ov., ovary; Md. m., muscle of mandible; At^. m., muscle 

 of antenna; E., eye; See. 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. 



Alouella excisa. 



6. Female. 



6a. Shell of same. 



7. Antenna of same. 



8. Alouopsis latissima. Female. 



9. '' latissima var. media. Female. 



Caniptocei'cus uiacrurus. 



10. Post abdomen. 



10a. Lower angle of shell of same. 



