PARASITES OF GALVESTON BAY FISHES CHANDLER 127 



N. C, and that Tennent (1906) erroneously referred to as Gastero- 

 stomum gradlescens; the Beaufort form is apparently Bucephalopsis 

 haimeana. 



The last-mentioned species was recorded by Tennent (190G) in a 

 metacercarial state in washings from the stomach and intestine of 

 Menidia. "When viscera of infected Meiiidia were fed to carnivorous 

 fishes, some further development of the young flukes took place. 

 The first intermediate host of this parasite was found to be the 

 oyster, and it is not improbable that the same is true of the species 

 here described. The method of infection of Menidia is uncertain; 

 the occurrence of the young flukes in the walls of the intestine makes 

 it highly probable that the cercariae, liberated from sporocysts in a 

 bivalve host, are swallowed by the Menidia. In the case of a re- 

 lated fresh-water bucephalid, Bucephalus papillosus (referred to the 

 genus Rhipidocotyle by Eckmann, 1932), the cercariae liberated 

 from fresh- water mussels (Unionidae) penetrated the flesh of young 

 bass at the base of the fins and encysted there (Woodhead, 1929). 



Family HEMIURIDAE Liihe, 1901 



LECITHOCHIRIUM MICROSTOMUM. new species 



Plate 6, Figures 2, 3 



Specifjc diagnosis. — Specimens with ripe eggs and caudal append- 

 age retracted are 2.T5 to 4.8 mm long, with maximum width of 0.875 

 to 1 mm. One individual with extended caudal appendage meas- 

 ures 3.76 by 0.63 mm; appendage about 1 mm long. Cuticle without 

 spines or rings. Maximum width at about level of vitelline glands 

 or behind them. Oral sucker 140/* to 200/x in diameter, without in- 

 ternal lateral protuberances. A deep sinus present on ventral sur- 

 face of body between ventral sucker and genital opening, and a spe- 

 cial small round depression, characteristic of genus, just anterior to 

 ventral sucker. Ventral sucker 365/i to 540/1,; ratio between size of 

 oral and ventral suckers, 1 : 2.5 to 1 : 2.8. Pharynx round, 70/x, to 

 110/x in diameter, contiguous with oral sucker, and followed by 

 swollen, nearly spherical esophagus about same size as pharynx. 

 Intestinal ceca pass laterally to sides of body, at right angles to 

 long axis of body, then turn and pass posteriorly, ending at about 

 level of retracted appendage. Disposition of genital glands as usual, 

 testes close together and obliquely situated. Ovary farther behind 

 testes than testes are behind ventral sucker. Yolk glands at level 

 of or immediately behind ovary, each with three or four lobes, which 

 are scarcely if any longer than wide. Uterus fairly voluminous, oc- 

 cupying most of space around testes and between testes and ovary, 

 and with loops extending posterior to ovary and yolk glands, on left 



