MAY: EFFECTS ON BAIRDIELLA ICISTIA 



v-jj 



Figure 7. — Developmental abnormalities. A) stage lib, at 18°C-30''/oo , showing unusual clover- 

 leaf appearance of blastomeres; B) stage He, 18°C-30"/oo, showing enlarged periblast and 

 clumped cytoplasm; C) stage He, 18°C-30%o, showing clumped cytoplasm; D) stage He, 

 30°C-30''/oo, showing irregular cleavage pattern; E) stage Ilia, 30°C-30°/oo, showing abnormal 

 germ ring and clumping of cytoplasm; F) deformed embryo unable to free itself completely from 

 the chorion, 24°C-20<'/oo. 



(Figure 7), and some eggs showed clumping of the 

 cytoplasm similar to that observed at 18°C. Lar- 

 vae hatching at 30°C were inactive. By following 

 the development of individual eggs in the sup- 

 plementary containers, it was noted that, no mat- 



ter what the temperature or salinity, irregularly 

 cleaving eggs usually died before completing gas- 

 trulation, and none ever hatched. At 21°, 24°, and 

 27°C, hatching was generally poorer at the higher 

 salinities (Table 7). At 55%o virtually no hatching 



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