130 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.88 



Hosts. — Caranx chrysos., lumpfish {Gyclopterus lumpus), shark- 

 sucker {Echeneis naiccrates), round herring {Etrumeus sadina)^ little 

 tunny {Euthyrmus allettsratus) ., leatherjacket {Oligoplites saurus), 

 remora (Remora remora), rudderfish {Palinurichthys perciformis), 

 bluefish {Pomatomus saltatnx)^ goggler {Trachurops crumenoph- 

 thalma)^ cutlassfish {Trichiurus leptums). 



Record of collections. — From Caranx chrysos: One, collected 

 August 8, 1904. Measurements, life : Length, 1.35 mm. ; diameter of 

 oral sucker, 0.10 mm. ; ventral sucker, length, 0.22 mm., breadth, 0.26 

 mm. ; ova, 0.014 by 0.009 mm. 



One (U.S.N.M. No. 8350), collected October 15, 1915. Measure- 

 ments in balsam : Length, appendix missing, 0.95 mm. ; breadth, 0.36 

 mm.; diameter of oral sucker, 0.11 mm., of pharynx, 0.06 mm., of 

 ventral sucker, 0.23 mm. ; ova, 0.014 by 0.009 mm. 



From lumpfish: One (U.S.N.M. No. 8351), collected July 10, 1926. 

 Measurements in balsam: Length, appendix retracted, 2.10 mm.; 

 diameter of oral sucker, 0.12 mm., of pharynx, 0.06 mm., of ventral 

 sucker, 0.28 mm. ; ova, 0.018 by 0.012 mm. 



From sharksucker: Eighty-eight (U.S.N.M. No. 8352), collected 

 August 19, 1903. Alcoholic specimens, much distorted: Length of 

 longest about 3 mm. Average of eight in balsam : Diameter of oral 

 sucker, 0.12 mm., of ventral sucker, 0.32 mm.; ova about 0.020 by 

 0.012 mm. 



From round herring: One, collected July 28, 1908. Measurements 

 in balsam, appendix retracted: Length, 1 mm.; breadth, 0.28 mm.; 

 diameter of oral sucker, 0.10 mm., of pharynx, 0.04 mm., of ventral 

 sucker, 0.22 mm. ; ova few, not distinct, about 0.018 by 0.010 mm. 



From little tunny: Nine (U.S.N.M. No. 8353), collected August 12, 

 1905; from 1.8 mm. to 2.6 mm. in length; variety of shapes; color 

 of larger specimens pale pink, others translucent, almost colorless, 

 except where the amber-colored eggs lie; active sperm noted at pos- 

 terior border of the ovary. Average of four, life: Diameter of oral 

 sucker, 0.14 mm., of ventral sucker, 0.41 mm.; average of seven in 

 balsam, oral sucker, 0.12 mm., ventral sucker, 0.33 mm. 



From leatherjacket: One (U.S.N.M. No. 8354), collected July 14, 

 1924. Measurements in balsam: Length, 2.10 mm.; breadth, 0.45 

 mm.; diameter of oral sucker, 0.12 mm., of pharynx, 0.06 mm., of 

 ventral sucker, 0.28 mm. ; ova collapsed and crowded, about 0.015 by 

 0.007 mm. 



From remora: Nine (U.S.N.M. No. 8355), collected July 28, 1910, 

 from stomach at pyloric opening; pale red, active, with tendency 

 to cling together when placed in sea water; excretory vessels seen to 

 unite above pharynx; right vitelline gland four-lobed, left three- 



