PLATE 2. 



Fig. 7. Sagitta neglecia Aida. X 3. 



Fig. 8. Eulrohnia humaia (Mobius). X 3. 



Fig. 9. Eul'rohma subtilis (Grassi). X 3. 



Fig. 10. Spadella draco Krohn. X 8. 



Fig. 11. Sagitta tenuis Conant. X 8. 



Fig. 12. Sagitta elegans Verrill. X 3. 



Fig. ]3. Sagitta arctica Aurivillius. & 3. 



ABBREVIATIONS 



coL— collarette. seiz. ./.—seizing jaws. 



ifit. — intestine. sem. v. — seminal vesicle. 



ov.— ovary. vent, f/.— ventral ganglion. 



[174] 



