LIST OF ILLUSTRATIONS. XI 



^^ Paso. 



PlJVTK Vil.— Ephyroides rotaformis, exambral enrface 973 



VUL — Halicreas minimnm, five views 973 



IX. — Solmaris inciaa, life size 97g 



X. — Pterophysa grandis, Angelopsia globoea, and Bhizophysa nvaxla 978 



DEVELOPMENT OF FINS." 



Flo. 1. — A larva of Branobiostoraa 986 



2. — A larva of ChimaBra monatrosa 987 



3.— Embryo of cod 987 



4. — Primitive arrangement of fln-rays 988 



5. — Development of tail fin 98s> 



6. — Development of tail fin 989 



7. — Development of tail fin 989 



8. — Cbordal axis in heterocercal Amiuras 990 



Plate I lose 



Fig. 1. — Male of Cbimaera monstrosa. 

 2. — Side view of embryo ray. 

 3-10. — Stages of development of tail of floimcler. 



Plate n 1088 



Fig. 1. — Vortical section of tail of shad. 



2. — Tail of shad four days after batching. 



3. — Tail of California salmon. 



4.— Tail of embryo landlocked salmon. 



platb m 1000 



FIG8. 1-4. — ^Views of tail of embryo Atlantic salmon. 



Plate TV 1092 



Fig. 1. — Candal skeleton of Amiums albidus. 

 2. — Tail of embryo Sipbostoma. 

 3. — Tail of very young Ilippocampns antiqaorum. 

 4. — Tall of very young Anguilla. 



Plate V 1094 



Fig. 1.— Caudal skeleton of Coccosteus. 

 2. — Caudal .skeleton of Polypterns. 

 3. — Caudal skeleton of adult Lepidosteua. 

 4.— Caudal fin of Platysomus. 

 5.— Tail of young Lopidosteu.s. 

 C. — Side view of tail of young Lepidosteas. 

 7. — Caudal skeleton of young Cyprinodont. 

 8. — Caudal skeleton of Centrina salviani. 



Plate VI 1096 



Fig. 1. — Caudal skeleton of Salmo fario. 

 2. — Caudal skeleton of Salmo salar. 

 3.— Caudal skeleton of Barbns flnviatilis. 



Plate Vn 1098 



Fig. 1. — Caudal skeleton of Cottus gobio. 



2.— Caudal skeleton of Perca fluviatilis. 

 3. — Tail of Ecbiodon dentatns. 

 4. — Tail of Fierasfer acus. 



Plate VITI 1100 



Figb. 1-6. — Stages of development of Mola. 

 7-9. — Caudal skeletons of Mola. 



Plate IX 1102 



Fig. 1. — Tail of recently hatched salmon. 



2. — Insertion of muscles of anal fin of young ealmon. 

 3. — Part of tail of young codfish. 

 4-10.— Sections through tail of young salmon. 

 11-12. — Diagrama of parts of fins. 



Plate X 1104 



Fig. 1.— Section through WoMan ridge of chick. 



2. — Section through dorsal fin of embryo Squalua. 



3. — Section through pectoral fin of embryo Scyllinm atellare. 



" In Ryder's Origin of Ileterocercy and Evolution of Fins and Fin-raya. 



