TREMATODES FROM FISHES — LINTON 109 



and testes are present, the ovary being in front of the testes. The 

 worms when compressed are usually rather slender and of nearly uni- 

 form breadth. The ratio of the suckers would point to O. veliporum 

 rather than to O. cestoides. Since the studies of Manter show that 

 differences in ratio of suckers are of little value, and other workers, 

 as Miililschlag and Odhner, rely mainly on the ova to distinguish 

 between species, it seems best to record these immature distomes under 

 the species O. cestoides. 



Encysted distomes from the goosefish are recorded by Stafford 

 (Zool. Anz., vol. 27, p. 483, 1904) and referred by him to a new genus 

 and species, Xenodistomum melanocystis. Of these encysted distomes 

 he says : "Resembles preceding species {Otodistonium velipomrn Crep- 

 lin) but is immature with rudiments of genital organs and ducts." 



Five, collected November 11, 1904. 



Four, collected July 31, 1905, in cysts on viscera of host. Measure- 

 ments, life: Length, 4 mm.; breadth, 1.5 mm.; oral sucker, length, 

 0.35 mm., breadth, 0.49 mm. ; pharynx, length, 0.30 mm., breadth, 0.20 

 mm.; ventral sucker, length, 0.50 mm., breadth, 0.64 mm.; intestines 

 voluminous. 



Two, immature, collected July 2, 1910; length, 4 and 5 mm., respec- 

 tively ; breadth, 1 mm. Single excretory vessel from posterior end to 

 a point about halfway between the ventral sucker and the posterior 

 end, there dividing into two lateral branches which were traced to the 

 anterior sucker, but were not seen to unite. 



Three, immature, collected July 29, 1910 ; length, 5 mm. A num- 

 ber of cysts, on and in the stomach wall, most of them containing 

 larvae of the cestode RhynchohothriuTn imparispine, had been re- 

 moved from a goosefish. These distomes were found among this 

 material. 



Eight, collected May 22, 1911; lengths in formalin, 3 to 6.5 mm. 

 Mr. Edwards' notes do not state where these distomes were found in 

 the goosefish, but they resemble in every particular distomes from 

 cysts on the viscera. 



Thirty, immature, collected April 10, 1913; in dark-brown cysts 

 in the stomach wall; cysts oval, 3.5 mm. in diameter, in formalin; 

 brown color due to degenerate tissue ; worms plump, from 3 to 5 mm. 

 in length. Measurements in glycerin : Length, 3.12 mm., breadth, 0.87 

 mm. ; breadth of oral sucker, 0.46 mm., of ventral sucker, 0.60 mm. 



One, collected July 15, 1914, found by Dr. MacCallum on mesentery 

 of host. 



Three (U.S.N.M. No. 8306), collected August 17, 1923, in cysts as- 

 sociated with cestode cysts. Measurements in balsam : Length, 10.5 

 mm., breadth, 1.65 mm. ; oral sucker, length, 0.66 mm., breadth, 0.74 

 mm.; pharynx, length, 0.28 mm., breadth, 0.25 mm.; diameter of 



