Fig. 



2. 



fig. 



3. 



Fig. 



4. 



Fig. 



5. 



Fig. 



6. 



Fig. 



7, 



Fig. 



8. 



Fig. 



9. 



Fig. 



10. 



Fig. 



10a. 



PLATE E. 



Ahna quadrangular is, female. 



A. antennule. 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 erabr3'^o. t. tail of embryo. 

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

 of embryo, at 2. anteunge 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. oe. g. supra-oesophagal ganglion. P. F. pig- 

 ment fleck. 



brain, eye and pigment fleck of same. 

 Pleuroxus procurvus^ female, 

 foot of same. 

 Acroperus leucocephalus. 

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

 antennae of same. 

 Alonopsis latissima, female. 

 Ahnopsis media, female. 

 Camptoce.rcus macrurus, post-abdomen, 

 lower angle of shell of same. 



