The family Koellikeriadae. 161 



bous seminal reservoir, Tliere is iio definite peiiis althougli the end 

 portion of the canal niay be everted. The long tubulär ovary twists 

 through the whole body. Its connection with the Uterus was not 

 Seen. The uterus is a roomy canal which runs in loops through the 

 hinder part of the body turning forward to open directly behind the 

 male opening. Enormous numbers of eggs are found in it. The 

 ripe eggs measure 0,02 >< 0,015 mm and are without filament. 

 Two tubulär vitellaria accompany the testes and uterus in tlieir 

 windings. 



Maclaren restates the diagnosis of the genus Nemafobothrium 

 VAN Beneden as follows: much elongated distomidae with small 

 pear shaped pharynx, no mouth sucker. Mouth at anterior point: 

 small ventral sucker not far from mouth; simply bifurcated intestine: 

 excretory canal bifurcated at anterior end but without anastoraosis 

 over Pharynx; Hermaphrodites: ovary long tubulär; 2 long tubulär 

 vitellaria ; eggs without filament; 2 long tubulär testes without special 

 penis; Genital canals open separately on a papilla somewhat behind 

 the mouth; Laurer's canal? The animals live in pairs encapsulated 

 Uli the gills or in the flesh of sea fish. 



W. sardcie n, si), 



On the gills of the Bonito (Sarda sarda) I found (July 8, 1913) 



in the Laboratory the U. S. Fish Commission of Wood's Hole 



a few yellow cysts which were lodged between the layers of the 



gills. They were flattened and measured 9 X 4,50 X IjöO mm and 



were found to contain two worms which although tangled together 



are quite separate and unattached to one another. When disen- 



tangled and laid out straight these worms measure about 34 X 1 nim 



' and are quite yellow. The mouth at the anterior end is provided 



' with a fairly strong sucker but no abdominal sucker could be found 



'after the examination of four or five worms mounted in toto and 



.the serial sections of two pairs. 



The anterior part of the body is rather suddenly narrowed 

 from the rest but is flattened out somewhat for a short distance 

 behind the head and widened accordingly. The terminal mouth 

 j sucker is quite strong and muscular, It opens directly through the 

 more feebly muscular pharynx into the Oesophagus. This after a 

 very short course passes into a most curious Single intestinal canal, 

 which is surrounded by a thick bushy mass of cells so as to be a 

 very conspicuous object. Running almost straight at first it soon 



