] 50 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 83 



Type host. — Fundnlus heteroclitus. 



Location. — Peritoneal cavity. 



Locality. — Galveston Bay, Tex. 



Type specimen. — U.S.N.M. Helm. Coll. no. 39545. 



Remarks. — These relatively huge immature nematodes are fairly 

 common, coiled up in the body cavities of both Gyprinodon varie- 

 gatus and FunduJus heteroclit'us, some of which are only about half 

 as long as the worms. Usually one but occasionally two specimens 

 occur in a single host. 



AGAMONEMA VOMITOR, new species 



Plate 12, Figures 1-4 



Specific diagnosis. — Length 7.3 to 9.6 mm, with diameter of 165/x 

 to 250/x, uniform for most of length. Cuticle finely striated except 

 on dorsal side of tail, where there are coarse corrugations. Head 

 90/A to llO/x in diameter, capable of partial retraction so that cuticle 

 may form a slight collarette. Two lateral lips, each with a promi- 

 nent median papilla (pi. 12, figs. 1, 2) ; breadth of lips 32^ to 38)u,. 

 Anus 135ju, to ITSyu, from posterior end, the tail with minute knob- 

 like termination (pi. 12, fig. 4), actually longer in small specimens, 

 presumably males: esophagus 1.5 to 2.2 mm long, with diameter of 

 65/x to 95/A, not divided into two regions; entire membranous lining 

 of esophagus peculiar in being torn loose and turned inside out, 

 remaining attached to mouth, when living specimen is cleared in 

 carbolic acid and exposed to pressure under cover glass (pi. 12, 

 fig. 3) ; esophageal lining when so everted has diameter of 45ja in 

 bulblike anterior expansion, then narrows to 22//,, and then gradually 

 widens to about 50^. Nerve ring 160/x to 200/a from anterior end. 

 Excretory pore about lOOjU to 120jU. behind nerve ring. No trace 

 of reproductive tubes present. 



Host. — Ictalurus fwrcatus. 



TjOcation. — Stomach. 



Locality. — Galveston Bay, Tex. 



Type specimien. — U.S.N.M. Helm. Coll. no. 39547: paratypes. no. 

 39548. 



Remarks. — Several dozens of these inmiature nematodes were 

 found in the stomach of a specimen of Ictalurus furcatus., a catfish 

 ordinarily found in fresh water. The relationships of the worm are 

 doubtful, but the lips and general a])pearance suggest affinity with 

 the Physolopteridae. 



