NOTES ON SPECIES OF SAGITTA — GRAY. 



179 



o. Tail bilobed . . . . . . , . . . mistralis 



Tail not bilobed 6 



4. Posterior teeth more than 15 . . . . . . 7 



Posterior teeth fewer than 15 . . . . . . 9 



7. Anterior fins with rays throughout . . . . elegans 

 Anterior fin with clear inner zone . . . . 8 



8. Width 8 per cent, to 12 per cent, of the total 



length . . . . . . . . . . . . enflata 



Width 5 per cent, to G per cent, of the total 



length .. .. .. .. .. .. phinipini 



9. Anterior fin reaches ganglion . . . . . . lyru 



Anterior fin does not reach ganglion . . . . hcxaptera 



10. Posterior teeth more than 15 . . . . . . seiotta 



Posterior teeth fewer than 15 . . . . . . 11 



11. Tail more than 30 per cent, of the total length eqnatoria 



Tail less than 30 per cent, of the total length 12 



12. Lateral fins confluent . . . . . . . . maxima 



Lateral fins separated ... . . . . . . atlaniica 



1 3. Collarette long . . . . 14 



Collarette short . . . . 21 



14. Collarette very conspicuous . . . . . . 15 



Collarette not very conspicuous .. .. .. 18 



15. Collarette extends to vesiculse seminales . . . . californica 



Collarette does not extend to vesicute seminales 16 



16. Vesicula; seminales reached by posterior fins . . 17 



VesiculiE seminales not reached by posterior fins pJanctonis 



17. Vesiculas seminales reached by tail fin . . . . robusta 



A''esicula3 seminales not reached by tail fin . . regvlaris 



18. Tail more than 25 per cent, total length of body ncglecta 



Tail not more than 25 per cent, total length of 



body 19 



19. Anterior fin with rays throughout . . . . 2(1 



Anterior fin with clear inner zone . . • . . < nflata 



20. A^esiculae seminales reached by tail fin . . . . helence 

 A'^esicula; seminales not reached by tail fin . . elegans 



21. A^esicute seminales reached by posterior fins . . 22 



A-'esiculje seminales not reached by posterior fins 27 



22. A^esiculai seminales reached by tail fin . . . . 23 



Vesieula? seminales not reached by tail fin . . 25 



23. Posterior teeth more than 14 . . . . . . 24 



Posterior teeth fewer than 14 . . . . . . pmchra 



24. More than 50 per cent, of the posterior fin on 



body . . . . . . . . . . . . lielcna' 



Less than 50 per cent, of posterior fin on body fridrici 



25. Tail more than 25 per cent, of total length . . 26 



Tail not more than 25 per cent, of total length elcgav.i 



26. Anterior fin longer than posterior . . . . neglecia 



Anterior fir. shorter than posterior . . . . tenvis 



