52 W. N. F. WOODLAND 



or the right pectoral fin, or, as on one occasion, under both). 

 From sixteen only of these fifty-one fishes did I ol)tain active 

 A . p a r a g o n o p o r a , 



I may also mention that no relationship exists between the 

 size of the fish and the degree of infestation by or size of the 

 active parasite, since some of my largest x\mphilina have been 

 obtained from very small fish : thus e.g. in one Macrones 

 a o r 450 mm. long I found in the body-cavity my two largest 

 specimens of Amphilina (each 280 mm. long), also one about 

 40 mm. long, two 20 mm. long, one 15 mm. long, and two 

 10mm. long, and in a Macrones seenghala only just 

 over 220 mm. long I obtained three Amphilina (70 mm., 

 64 mm., and 59 mm. long), while in many other fishes, over 

 900 mm. in length, I obtained only one or two Amphilina 

 measuring not more than 20-80 mm. 



In addition to what 1 have called the active parasite, there 

 also exist in a still larger percentage of the fishes masses of 

 tissue of various sizes and usually of irregular form which 

 closely resemble the parasite in colour and to some extent 

 consistency (PI. 3, fig. 2). These masses, which range from 

 minute spheres and ovoids (PI. 3, fig. 2, a) up to large shapeless, 

 often very thick, bodies (PL 3, fig. 2, c-n), are usually attached 

 to the mesentery, but are also to be found free in the body- 

 cavity, and, although of the same colour, yet can easily be 

 distinguished from masses of fat by their more solid texture. 

 Though evidently consisting of the same kind of tissue as the 

 parasites, yet they can usually be easily distinguished from 

 these, not only on account of their lack of definite form, but 

 by the fact that they cannot be flattened out between glass 

 slides. In some cases the connexion between these masses 

 and the })iirasites is betrayed by parts of these masses assviming 

 the characters of parts of the body of the active Amphilina 

 paragonopora (usually the anterior or posterior end — 

 PL 3, tig. 2, >n, It), and in other cases tliese masses are almost 

 exactly similar in form to the parasite (PL 3, fig. 2, g, li,j, k) 

 and can only be thstinguished by their total immobility (lack 

 of contractions) when removed from the fish and the fact, 



