NO. 14 MANTER : DIGENETIC TREMATODES OF FISHES 337 



SPECIFIC DIAGNOSIS OF BUCEPHALUS VARICUS 



A. Panama material from Caranx species 



Length 0.892 1.087 1.134 1.269 



Width 0.187 0.285 0.210 0.232 



Anterior 



sucker 0.112 0.120 0.120 0.120 



Eggs ... 17 to 20 by 1 1 to 14 ;Li 



B. Tortugas material from Caranx ruber 



Length 0.705 0.750 0.862 



Width 0.195 0.202 0.180 



Anterior sucker about 0.060 



Eggs 19 to 20 by 9 to 10 /x 



C. Tortugas material from Caranx latus 



Length 0.999 1.147 1.107 1.458 



Width 0.127 0.127 0.150 0.130 



Anterior sucker 0.076 to 0.093 



Eggs 17 to 20 by 11 to 16 fx. 



Tentacles 7, usually retracted; each tentacle with a large basal and 

 a small distal prong. In two instances (fig. 6) a minute spinelike addi- 

 tional prong was seen on the under side near the tip of the tentacle. The 

 distal half of the tentacle seems to be retractile into the basal portion, 

 telescopelike. Upon disintegration this distal portion of the tentacle seems 

 to disappear early, leaving a finely granular threadlike core. Mouth pos- 

 terior to midbody, usually considerably so, sometimes posterior to all 

 gonads (fig. 8), sometimes between the testes, sometimes anterior to all 

 gonads (fig. 5). Intestine sac shaped. Excretory vesicle I shaped, ex- 

 tending anterior to vitellaria almost to the anterior sucker. Gonads tan- 

 dem, testes usually large and close together; posterior testis overlapping 

 cirrus sac. Cirrus sac more than % body length but varying consider- 

 ably in length, with saclike seminal vesicle, long pars prostatica, large 

 genital lobe and atrium, long atrial tube, muscular near the pore ; genital 

 pore near posterior end of body. Ovary ovoid, directly anterior to an- 

 terior testis. Vitellaria in 2 lateral groups, follicles usually crowded close 

 together, usually 12 to 16 on each side, usually in region of ovaiy but in 

 extended specimens reaching well anterior to ovaiy. Yolk ducts extend 

 backward and unite between the testes. From the right descending duct 

 a tube leads anteriorly toward the ovary (fig. 3). Nagaty does not de- 

 scribe this long loop of the yolk ducts. Uterus may or may not extend 

 anterior to vitellaria, usually extending posterior to genital pore (but 

 not in young specimens). Eggs 17 to 20 by 9 to 16 /i, usually about 17 

 to 20 by 10 to 14 ^. 



