2l6 RESEARCHES IN HELMINTHOLOGV AND PARASITOLOGY. 



The gills were swarming with the little crustacean parasite Krgasihis 

 labracis. In many of these the thorax and egg-sacs were opaque 

 milk-white, but in most of them the latter w^ere more translucent 

 and of a blue color. This difference is due to the development of 

 the embryos, within which there appears blue pigment. 



Attached to the gills there were three opaque milk-white fluke- 

 worms, and a fourth of the same kind was embedded in the muscular 

 coat of the pharynx. These appear to pertain to an undescribed 

 species, and \\\q.\ therefore be distinguished by the following name 

 and description : 



Distomuvi galactosoimivi . — Opaque milk-white, depressed, spatu- 

 late, narrowest in advance, obtusely rounded at both extremities, 

 dorsalh' convex, ventrally flat. Head rounded truncate or trans- 

 versely oval discoid, with prominent margin, unarmed ; neck short, 

 slightly widening to the ventral acetabulum, which is sessile, larger 

 than the oral acetabulum and with its orifice appearing triangular ; 

 posterior part of the body elliptical, in movement expanding and 

 becoming thinner and translucent and concave beneath, with the 

 opaque white intestine on each side shining through. At rest about 

 6 mm. long by 2 mm. wide, elongating to 12 mm. by 2.5 mm. wide 

 posteriorly and i mm. at the base of the neck. 



After being killed in dilute alcohol the specimens remained of 

 spatulate shape, 6 to 8 mm. long, 2 mm. wide behind. The oral 

 acetabulum 0.625 broad ; the ventral acetabulum, situated 1.375 mm. 

 back of the summit of the head, was 0.875 broad. 



When the animal was in motion and expanded the posterior por- 

 tion of the bod 3^ to such an extent as to render it translucent, the 

 intestine on each side became especially conspicuous through its 

 white opacity. The intestines extended directly from the minute 

 pharynx to the caudal extremitj', more or less tortuous, according 

 to the degree of elongation or shortening of the animal. The}- are 

 widest back of the ventral acetabulum and are sacculated. In the 

 expanded condition of the body, I)}- transmitted light, it exhibited a 

 minutely recticular appearance, the lines of the rete being more 

 opaque white and apparently according with a capillary net com- 

 municating laterally with the vessels proceeding from the caudal 

 vesicle. The opaque white appearance of the body seems to be due 

 to the presence of granules of calcium carbonate, for the application 

 of acetic acid caused their disappearance with the evolution of bub- 

 bles of gas, and the body became more uniformly translucent with- 

 out, however, affecting the white opacity of the intestines. The 

 generative apparatus appears to be undeveloped, as no distinct 



