F. A. FOTTS 



PLATE 1. 



Hapalocarcinus marsupialis. Female. 



Fig. 1. Stage I. Ventral view. Narrow abdomen and no reproductive apertures. Carapace 

 length, 1.75 mm. X 18. 



Fig. 2. Stage II. Ventral view. Abdomen reflexed to show rudiments of the three pairs of 

 appendages. Female apertures developed, fa., position of the generative apertures; 

 r. s., rudimentary appendages of the abdomen. Carapace length, 2.0 mm. X 18. 



Fig. 3. Stage III. Ventral view of abdomen only. X 18. 



Fig. 4. Stage IV. Ventral view of individual boiled in caustic potash and mounted in Canada 

 balsam so that the female apertures and the abdominal appendages can be seen under- 

 neath the abdomen. Carapace length 3.0 mm. X 18. 



Fig. 5. Stage V. Ventral view. X 8. 



