416 BULLETIN OF THE BUREAU OF FISHERIES. 



ACANTHOCEPHALA. 



1 . Echinorhynchus /irixtis Rudolphi. 



1902. — Aug. 18, fragment of female. 



CESTODES. 



2. Scokx polymorphus Rudolphi. 



1902.— July 7. few. July 14, several, with t\v istse. July 21, 1, small. July 25, several, com- 



paratiyel) large, with two costaa and red pigment, like young Acanthobothrium, but without hooks. 

 July 31, many. Aug. IS, several, elongated, with two costse ami red pigment spots. Aug. 19, few, 

 small. 



A larval cestode found on July 17, and looking like an immature Rhynchobothrium, is here 

 recorded. 

 .".. Tetrarhynchus bisulcatus Linton. 



1901. — Aug. 26; scoliees from cysts in stomach wall. 



11(02. -July 25, few. Aug. 13, 6. Aug. 18, 6. 



TREMATODES. 



i. Distomumsp. [Figs. 161-164, 212. See also fig. 209.] 



Here are recorded several finds of small distomes which probably belong to the same species. 

 They agree in having the oral sucker. equaling or slightly surpassing the ventral Maker in diameter. 



I'M 1902.— July 7, 1. Dimensions, in millimeters: Length 0.96; breadth 0.51; oral sucker, length 

 0.09, hreadth 0.10; ventral sucker, length 0.09, breadthO.10. July21; 2. Dimensions, in millimeters: 

 Length 0.7; -breadth 0.3; oral sucker0.ll, ventral sucker 0.10. Ova present; one of the specimens 

 with conspicuous branching vitellaria laterally placed. Aug. IS; 1. Dimensions, in millimeters: 

 Length 0.62; oral sucker u.10, pharynx 0.04. ventral sucker 0.08. [Fig. 212.] 



(b) Larger than (a). [Fig. 164.] 1002. — July 17, 1. Dimensions, in millimeters: Length 1.35; 

 breadth, anterior 0.18, at ventral sucker 0.51, maximum, a little way behind ventral sucker, 0.57; 

 diameter of oral sucker 0.16, of ventral sucker 0.15; ova 0.022 by 0.014. .Inly 31; 2. Aug. 10; 1. 



(c) [Figs. 161-163.] 1002.— July 14, 2. These small distomes were found with the aid of the 

 compound microscope in a small piece of the intestine w hich was under examination for the character 

 of the food. They were not seen until the morning of the 15th, after they had lain overnight in sea 

 water, to which a few drops of formalin had been added. Each was peculiar in being somewhat 

 diagonally truncate at the posterior end. This truncated condition caused such an unusual appearance 

 that they were first, when hut slightly magnified, thought to he parts of the same worm accidentally 

 cut in two. Body covered with minute, flat spines, 0.005 mm. in length arranged in transverse rows. 

 I dimensions, in millimeters, of one specimen: Length 0. 70; maximum breadth near posterior end 0.35; 

 diameter of oral sucker 0.14, of ventral sucker 0. 1 1 ; pharynx, length 0.06, breadth 0.1145. ( Jorrespond- 

 ing dimensions of the other: Length 0.78; maximum breadth 0.53; diameter of oral sucker 0.15, of 

 ventral sucker 0. 12; pharynx, length 0.07, hreadth 0.045; ova 0.1)22 by 0.015. 



The stained and mounted specimens show some details of structure which were not evident in the 

 living worms. The testes are two, lateral and posterior; ovary between the right lestiv and ventral 

 sucker; vitellaria lateral, as far forward as the posterior edge of f he ventral sucker in one nearly to the 

 middle of the ventral sucker in the other. The cirrus appears to pass to the right side of the ventral 

 sucker to the genital aperture in front of that organ. It is relatively large ami armed with spines. 



No. s under HexanemalicMhys may he an immature example of this distome. [Fig. 209.] 



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