PECTORAL SKELETON OF TELEOSTEANS. 381 
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EXPLANATION OF PLATE 238, 
Illustrating Dr. H. H. Swinnerton’s paper, ‘ A Contribution 
to the Morphology and Development of the Pectoral 
Skeleton of Teleosteans.”’ 
List oF REFERENCE LETTERS. 
A. Preaxial border of the fin. c/. Cleithrum. co. Coracoid or coracoid 
region. f.4. Foramen for blood-vessel, or preecoracoid foramen. /. #. Fora- 
men for spinal nerve. fv. 1-8. Scapular foramen. fz.4. Postcoracoid fora- 
men. f.p. Fin plate. g.d. Glenoid line or border. 7.c/. Infracleithrum. 
m. Mesocoracoid arch or bone. m.c. Canal for dorsal fin muscles. 2. 1. 
First spinal or hypoglossal nerve. x.1-5. Spinal nerves 1-5. P. Post-axial 
border of fin. po.p. Postcoracoid process. pr. p. Precoracoid process. 
r. First formed radial. +.d. Distal radial. 7.m. Mesial radial. 7.p. Proximal 
radial. se. Scapula or scapular region. sc’. Scapular process. sp.c. Spinal 
cord. s¢. Stomach. ¢.m. Trunk muscle. 
Figs. 1—7, 9—11 were drawn from wax models reconstructed from 
serial sections. 
Fics. 1—8.—Pectoral skeleton of Salmo salar. 
Fig. 1.—Stage 1. 15°5 mm. long. x 68. External view. 
