PARASITES OF GALVESTON BAY FISHES CHANDLER 137 



Type host. — Lepisosteus osseus. 



Location. — Intestine. 



Locality. — Gah^eston Bay, Tex. 



Type specimen. — U.S.N.M. Helm. Coll. no. 39525. 



Remarks. — This species comes strikingly near to P. amhloplitis 

 Leidy as described and figured by Benedict (1900), although it looks 

 much different from specimens examined by me taken from Microp- 

 terus dolomieu in Douglas Lake, Mich., and referred to that species 

 by LaRue. No other member of the genus Proteocephalus except 

 P. amhloplitis as described by Benedict has a vaginal sphincter even 

 approaching that of the species here described (LaRue, 1914) . 



P. australis differs from P. amhloplitis as described by Benedict 

 in the following particulars : In P. amhloiJlitis all the segments, 

 except sometimes a few square posterior ones, are broader than long ; 

 in P. australis all proglottids beyond 75/* to 100/* from head are 

 longer than broad, some over tw^o and one-half times longer. In 

 P. amhloplitis the scolex is sharply set off from the neck, which in 

 Benedict's figures appears to be only 300/* to 400/* broad, and the 

 suckers are separated by deep sulci ; in P. australis the scolex is 

 hardly broader than the neck, and there are no sulci between the 

 suckers. In P. ambloplitis the inner longitudinal muscles are ar- 

 ranged in 50 to CO distinct bundles ; in P. australis these muscles are 

 not distinctly segregated into bundles. In P. amhloplitis the vas 

 deferens is intricately coiled in the cirrus pouch, and the protruded 

 cirrus measures about 500/* to TOO/* in length ; in P. australis the vas 

 deferens has only about three loops inside the cirrus pouch, and 

 the protruded cirrus has a length of 1.5 mm. In P. amhloplitis the 

 vitellaria are described and figured as extending anterior to the 

 cirrus pouch on the poral side; in P. australis they rarely do this. 

 In P. amhloplitis the ovaries are described as retort-shaped and 

 figured as narrow anteroposteriorly ; in P. australis each lobe lat- 

 erally is about as broad anteroposteriorly as it is transversely. So 

 far P. ambloplitis has been recorded from various species of bass 

 and from the bowfin {Atnia calva) in fresh-water lakes and streams 

 while P. australis was found in a gar in the highly brackish water 

 of Galveston Bay. Two specimens were found in one of three 

 host specimens examined. 



PROTEOCEPHALUS ELONGATUS. new species 



Plate 8, Figukes 7, 8 ; Plate 9, Figures 1, 2 



SpecifiG diagnosis. — Total length about 560 mm. Head 675/i to 

 765/1 in diameter with an apical prominence, very prominent suckers 

 and deep sulci between suckers extending back on neck to a point 

 about 800/1 to 900,u from anterior end (pi. 8, fig. 7) . Suckers about 



