Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Puate 11, 
Figs. 52-57. Halosaurus radiatus Garman. 
52, The fish seen from the side. Drawing; natural size. 
53. Radiating cephalic disc in transmitted light. Photograph; magnified 1:17. bi’, 
large blood vessel leading to the disc; n, main disc nerve; n/, smaller ac- 
cessory dise nerves. 
54. Radiating cephalic disc in transmitted light. Photograph ; magnified 1: 41. b’ 
large blood vessels leading to the disc; n, main dise nerve; n‘, smaller ac- 
cessory disc nerves. 
55. Radiating cephalic disc in transmitted light. Photograph; magnified 1:17. b’, 
large blood vessel leading to the disc; n, main disc nerve; n’, smaller ac- 
cessory dise nerves. 
56. Transverse section through a cephalic radiating disc along its longer axis. Stained : 
haematoxylin-picric acid-fuchsin. Drawing ; magnified 1:42. b, close capillary 
network of blood vessels underlying the cylinder cell layer; b’, large blood vessel 
leading to the disc; ¢, thickened connective tissue of the inner wall of the slime 
canal on which the cylinder cell layer rests; cv, cavity of slime canal; d, cyl- 
indrical cells of the radiating disc; m, marginal zone of the radiating disc; n, 
main dise nerve; s, outer wall of slime canal. 
57, Part of a transverse section through the cylinder cell layer of a cephalic radiating 
disc. Stained: haemotoxylin-picric acid-fuchsin. Drawing ; magnified 1 : 200. 
b, close capillary network of blood vessels underlying the cylinder cell layer : 
c, thickened connective tissue of the inner wall of the slime canal on which the 
cylinder cell layer rests; d, cylindrical cells of the radiating discs. 
