LIST OF SPECIES. 
Xll 
Sub-ord. III. Cyclostomi, 142 
Fain. I. Petromyzon im, 142 
i. Petromyzon, 143 
1. Petromyzon marinus, 143 
ii. Lampetra, 143 
1. Lampetra fluviatilis, 144 
2. Lampetra Planeri, 144 
iii. Ammoccetes, 144 
1. Ammocoetes branchialis, 145 
Fam. II. Myxinule, 145 
i. Myxine, 145 
1. Myxine glutinosa, 145 
Fam. III. Amphioxid^;, 146 
i. Branchiostoma, 146 
1. Branchiostoma lanceolatum, 
146 
