of the Fishery Board for Scotland. 



67 



Fig. 29. Section through a scar on the shoulder of a Gadus callarias. 

 ,, 30. Enlarged drawing of black spots (cysts) showing through four scales. 

 Gadus merlangus. 



31. Cyst in the muscles of Gadus callarias which contained a nematode. 



32. Enlarged drawing of one of the black spots (cysts) in the skin of Gadus 



merlangus. 



,, 33. Section of the skin of Gadus merlangus to show the situation of the black 

 cyst. 



34. Shoulder of Gadus callarias, with scars probably caused by Cephalopod 

 Mollusc. 



PLATE IV. 



Fig. 35. Abdomen of Gadus callarias with encysted sand-eel. 

 36. Zoarces viviparus, ventral view enlarged. 

 ,, 37. Abnormal JRaia circularise Reduced a little. 



.38. Gadus aigUfinus, wall of abdomen with encysted sand-eel. 



it 39. , , ,, , , ,, ,, 



,,40 „ ,, sand-eels. 



,, 41. Gadus callarias, without a tail ; hind end. About nat. size. 

 , , 42. Branchiostegal ray of a Gadus callarias having upon it a growth of Zoophytes. 

 ,, 43. Zoarces viviparus, \\\ inches (29 cm.) long, having tumours in its body. 

 Dorsal view. 



,, 44. Gadus callarias, with sand-eel in the abdominal cavity. 



PLATE V. 



Fig. 45. Tumour from abdominal cavity of a Gadus callarias. Reduced. 



46. Nematode encysted in abdominal cavity of Gadus callarias. Enlarged. 

 , , .47. Eupagurus bernhardus in abdominal cavity of Gadus callarias. 

 ,, 48. Nematode encysted in abdominal cavity of Gadus callarias. About 

 nat. size. 



,, 49. Abnormal JRaia, clavata. Reduced. 

 49 a 



, , 50. Enlarged drawing of muscles at angle of cleft in anterior region of abnormal 



Raia clavata. Cp. fig. 49. 

 ,, 51. Egg of Brosmius brosme. Enlarged. 

 ,, 51a. Abnormal ovary of Haddock, p. 



,, 52. Interior of tumour found in the abdominal cavity of Gadus callarias. Cp. 

 fig. 45. 



,, 53. Plan of pond at Laboratory. Scale, 1 mm. — 1 foot. 



PLATE VI. 



Fig. 54. Hermaphrodite reproductive organ of Cod {Gadus callarias). 



55. Section through the wall of ovary at junction of right and left ovaries. 

 Hermaphrodite cod (fig. 59). 

 , , 56. Scale from outside of tumour of Pleuronectes microcephalus. 

 ,, 57. Tumour on outside wall of stomach of Gadus callarias. 

 ,, 58. Longitudinal section of tumour on tail of Gadus callarias (fig. 61). 

 ,, 59. Hermaphrodite reproductive organ of Gadus callarias. 



60. Section of wall of ovary of preceding (fig. 59), showing lacuna?. 

 ,, 61. Tumour on tail of Gadus callarias. x f. 

 ,, 62. Tubules on surface of frill from tumour shown in fig. 61. 

 ,, 63. Inside surface of stomach. The dotted line indicates the position of 



the tumour (fig. 57). 

 ,, 64. Section through vasa dejerentia and vein of anterior testis (fig. 59). 

 ,, 65. Surface view enlarged of part of tumour (fig. 61). 

 ,, 66. Pleuronectes microcephalus, with tumours on the skin. 



,, 67. Section through the mesenteries and vasa deferntia connecting the hind 



testis to the ovary (fig. 59). 

 ,, 68. Side view of ovary and hind testis (fig. 59). 

 ,, 69. Section through tumour on skin of Pleuronectes microcephalus. 

 ,, 70. Semi -diagrammatic section of wall of ovary showing chambers in it (fig. 59) 

 71. Section through stalk connecting the testis to ovary (fig. 54). 



