| Key | Title |
| 47 | Key to the hound sharks (Triakidae) of Europe. |
| 108 | Key to the species of houndsharks, smoothhounds, topes (Triakidae) occuring in the Western Central Pacific. |
| 562 | Key to Western Atlantic species of Mustelus. |
| 879 | Key to the species of houndharks (smoothounds, topes) (Triakidae) occurring in the Western Central Atlantic. |