REPORT OF COMMISSIONERS OF INLAND FISHERIES. 223 



20. Showing the differences in the rate of development of 2 groups of 



fourth stage lobsters under different conditions of water tempera- 

 ture at Wickford, R. I.. 198 



21. Showing the effect of temperature of the water upon the rate of develop- 



ment of lobsters in the first 3 stages at Woods Hole, Mass 199 



22. Showing the effect of different prevailing temperatures on the rate of 



growth of lobsters in the early stages at various points on the 

 Atlantic coast 200 



23. Showing the effect of sunlight upon the duration of the stage-period of 



some fourth stage lobsters at Wickford, R.I 205 



24. Showing the effect of sunlight upon the percentage of increase in size of 



some fourth stage lobsters at Wickford, R.I 206 



2.5. Data on the size and molting period of normal average lobsters in the first 



12 stages during the season of 1904 at Wickford, R.I 209 



26. Data on the size and molting period of normal selected lobsters in the 



finst 12 stages during the season of 1905 at Wickford. R.I 210 



XXI. List of Plates. 



Plate XXVI. First larval stage; length, 8 mm.; age, 3 days; lateral view. 

 Plate XXVII. First larval stage; length, 8 mm.; age, 3 days; dorsal view. 

 Plate XXVIII. Second larval stage; length, 9.5 mni.; age, 6 days; lateral view. 

 Plate XXIX. Second larval stage; length, 9.5 mm.; age, 6 days; dorsal view. 

 Plate XXX. Third larval stage; length, 11.5 mm.; age, 9 days; lateral view. 

 Plate XXXI. Third larval stage; length, 11.5 mm.; age, 9 days; dorsal view. 

 Plate XXXII. Fourth stage lobster; length, 14.8 mm.; age, 14 days; dorsal view\ 

 Pl.\te XXXIII. Young male lobster; length, 65 mm.; age, 14 months. 

 Plate XXXIV. Old male lobster; length, 18^ inches; weight, llf pounds; 



age, probably about 16 years. 

 Plate XXXV. Showing the construction of the cars containing the separate 



compartments in which the young lobsters w-ere raised. 

 Plate XXXVI. Showing a young lobster that has just molted, together with 



its cast shell. The lobster was still soft w^hen photographed. 

 Plate XXXVII. Showing the difference in size of three lobsters of the same age. 

 Plate XL. Showing the wire cylinders in which certain lobsters were confined. 



