TABLE OF CONTENTS. 
Class I. Leptocardii 
Order A. Cirrostomi 
Family 1. Branchiostomatidse 
1. Branchiostoma Costa 
1. lanceolatum Pallas. (Addenda) . 
Class II. Marsipobranchii 
Order B. Hyperotreta 
Family 2. Myxinid® 
2. Myxine L 
2. glutinosa L 
Family 2 (6). Bdellostomatid®. (Addenda) 
3. Polistotrema Gill. (Addenda) 
3. stouti Lock 
Order C. Hyperoartia 
Family 3. Petromyzontid® 
3 (6). Entosphenns Gill. (Addenda) . . 
4 (5, 6). tridentatus Gairdn 
4 (5). Ammocmtes Dnm 
§ Lampeiixi Gray 
7. pliimbeus Ayres 
7 (b). anreus Bean. (Addenda)... 
§ Ammoccctes 
8. nigerRaf 
8 (6). appendix Dek. (Addenda) . 
6 (7). Petromyzon L 
$ Ichthyomyzon Grd 
9. argenteus Kirt 
9 (6). hirudo Grd 
10. castanens Grd 
$ Petromyzon 
11. marinns L 
12. dorsatns Wild. (Addenda) 
Class III. Elasmobrancbii 
Subclass Selachii 
Order D. Sqnali 
Family 4. Scyranid® 
8. Ecbinorbinus Blainv 
13. spinosns Gmel 
9. Somniosns Le S 
14. microcephalus Bloch 
Family 5. Spinacid® 
10. Centroscyllinm M. & H 
15. fabricii Reinh 
11. Squalus L 
16. acanthias L 
^ 12. Centroscymnus Boc. & Cap 
17. cmlolepis Boc. «fc Cap 
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IX 
