of the Fishery Board for Scotland. 67 



Pi(i. 29. Section through a scar on the shoulder of a Gadu-i callarias. 

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



Gadus nurlangus. 

 ,, 31. Cj^st in the muscles of Gadus callarias which contained a nematode. 

 ., 32. Enlarged dr-awing of one of the black spots (cysts) in the skin of Gadus 



mei'langus. 

 ,, 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 



Mollu'c. 



PLATE IV. 



Fi(4. 35. Abdomen of Gadus callarias with encysted sand-eel. 



,, 36. Zoarces viviparus, ventral view enlarged. 



,, 37. Abnormal i?«i(X ciVc?t/am. Reduced a little. 



, , 38. Gadus ceglefinus, wall of abdomen with encj^sted sand-eel. 



)) ^J- J) i1 !^ )> J' >> 



,,40 .,, ,, ,, ,, ., sand-eels. 



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



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



,, 43. Zoarces ririparics, 11-J- 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 (tC6(^ms cn?^a»'«as. Enlarged. 

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

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



nat. size. 

 „ 49. Abnormal i?aOT cZaca^a. Reduced. 

 „ 49a. 

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



Raia clavata. Op. fig. 49. 

 ,, 5L 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. 



PL.^TE 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 microcep)halus. 

 , , 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 lacunis. 

 ,, 61. Tumour on tail of (rarZus ca^fa?7a.s. x ^. 

 ,, 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 defemtia 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). 



