TABLE OF CONTENTS. 



Page. 



CLASS I. LEPTOCAKDII 2 



Order A. Amphioxi 2 



Family I. Branchioslomklw 2 



Genus 1. Branchiostoma, Costa 3 



1. lanceolatum (Pallas) 3 



2. cariba;um, Sundeyall 3 



3. californiense, Gill 4 



Genus 2. Asymmetron, Andrews 4 



4. lucayanum, Andrews 4 



CLASS II. MAKSIPOBRANCHII 4 



Order B. Hvperotreti 5 



Family II. Heptalreniidx 5 



Genus 3. Polistotrema, Gill 6 



5. stouti (Lockington) G 



Family III. Myxinidx 7 



Genus 4. Myxine, Linn^us 7 



G. glutinosa, Linnaeus 7 



Order C. Hyperoarth 8 



Family IV. Petromijzonidse 8 



Genus 5. Bathymyzon, Gill 9 



7. bairdii (Gill) 9 



Genus 6. Petromyzon (Artedi) Linnfeus 9 



8. marinus, Linnwus 10 



8a. unicolor (De Kay) 10 



Genus 7. Ichthyomyzon, Girard 10 



9. concolor (Kirtland) 11 



10. castaneus, Girard 11 



Genus 8. EntospUeuus, Gill 11 



11. tridentatus (Gairdner) 12 



Genus 9. Lampetra, Gray 12 



12. aurea (Bean) 13 



13. spadicca, Bean 13 



14. cibaria (Girard) 13 



15. wilderi, Gage 13 



CLASS III. PISCES 14 



SUBCLASS SELACHII 15 



Order D. Diplospo.ndyli 16 



Family V. Chlamydoselafhidie 16 



Genus 10. Chlamydosclachus, Garman 16 



16. anguineus, Garman IG 



Family VI. Ilexanchidm ., 17 



Genus 11. Notorhynchus, Ayres 17 



17. maculatus, Ayres 17 



Genus 12. Hcxanchus, Rafinesque 18 



18. corinus, Jordan & Gilbert 18 



19. griseus (Gmelin) 19 



(XI) 



