26 G. O. Sars. 



Fig. 2. Same, ventral view. 

 » 3. Larva in the 2nd stage, viewed from above; X 120. 

 » 4. Same, ventral view. 

 » 5. Larva in the 3rd stage, viewed from the ventral 



face; X 120. 

 » 6. Larva in the 4th stage, viewed from above (left- 

 antenna and mandibular foot not fully drawn) 

 X 120. 

 » 7. Same, ventral view. 



PI. II. 



Fig. 1. Larva in the 5th stage, viewed from above (left 



antenna and mandibular foot not fully drawn); 



X 120. 

 » 2. Same, ventral view, 

 » 3. Larva in the 6th or last stage, viewed from the right 



side; X 120. 

 » 4. Somewhat more advanced larva of same stage 



viewed from above (left antenna and mandibular 



foot not fully drawn); -+- 120. 

 » 5. Same, ventral view. 



PI. III. 



Fig. 1. Young Estheria in the 1st postlaryal stage, viewed; 

 from left side; magnified 120 diameters. 

 » 2. A specimen in the 2nd postlarval stage, the shell 

 having acquired the 1st Hue of growth, viewed from 

 right side; magnified 95 diameters. 

 » 3. Another specimen in the 4th postlarval stage, with 

 3 lines of growth, exhibited from right side ; 

 X 30. 



