. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. SKELETAIv MUSCULATURE OF THE KING SALMON. 59 posterior border and tip of the corresponding fin ray. Each muscle slip is somewhat thicker at its external border. The muscle slips are from 30 to 35 mm. long anteriorly and 20 mm. at the posterior border of the series. They are about 4 mm. broad by i mm. thick in the middle of the muscle belly. They are closely wedged in between the bellies of the erector divisions. The anterior slips attached to the rudimentary rays are very small and slend

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. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. SKELETAIv MUSCULATURE OF THE KING SALMON. 59 posterior border and tip of the corresponding fin ray. Each muscle slip is somewhat thicker at its external border. The muscle slips are from 30 to 35 mm. long anteriorly and 20 mm. at the posterior border of the series. They are about 4 mm. broad by i mm. thick in the middle of the muscle belly. They are closely wedged in between the bellies of the erector divisions. The anterior slips attached to the rudimentary rays are very small and slender. The contraction of these muscles depresses the rays of the fin, tending to close it up against the body.. Fig. 14.—Deep muscles of the anal fin. e. a., erector analis; d. a., depressor analis; inc., four reflected tendons of the inclinator analis; re. i., retractor ischii (protractor analis); r. a., retractor analis. INTERFILAMENTI ANALIS. Between the fin rays of the anal fin, especially at the base and more strongly devel- oped anteriorly, are found delicate muscle fiber bundles. These muscles are attached to adjacent fin rays, being attached nearer the base of the anterior ray, and more distally to the posterior ray, carrying them in an oblique direction from ray to ray. Undoubtedly these sHps aid in the elevation of the fin rays. They are very delicate and consist of only a very few individual fibers, a fact which easily leads to their being overlooked. The protractor analis and the retractor analis are longitudinal muscles of the anal fin which have been described on page 34.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. United States Fish Commission. Washington, The Commission, Govt. Print. Off