PARASITES OF GALVESTON BAY FISHES CHANDLER 149 



DICHELYNE DIPLOCAECUM. new species 



Specific diagnosis. — Body short and thick, its widest point about 

 one-third of body length from anterior end; head end bluntly 

 rounded, posterior end tapering to pointed tail. Length of young 

 female 4 mm, maximum diameter 525/x. Vulva posterior to middle 

 of body length, dividing body about 11 : 9. Anus 175/* from pos- 

 terior end. Tail conical, terminated by short conical spine, 105/* in 

 diameter at anus. Cuticle finely striated, 50/i thick in middle eso- 

 phageal region, 35/i thick throughout most of body. Nerve ring 

 360/1 from anterior end. Excretory pore 665/t from anterior end. 

 Esophagus 800/t long, 145/t broad just behind mouth, narrowing to 

 75/1 about 350/t from anterior end, then club-shaped, with maximum 

 diameter about 120/t. Intestine ribbon-shaped, with transverse axis 

 much bent and folded, and with two flat folded anterior diverticula, 

 one dorsal and one ventral, the former somewhat the larger, reaching 

 nearly to nerve ring. 



Type host. — Ictalurus furcatus. 



Location. — Intestine. 



Locality. — Galveston Bay, Tex. 



Type s^ecm^w.— U.S.N.M. Helm. Coll. no. 39544. 



Remarks. — Only two young females were found. This species 

 differs from all other known members of the family Cucullanidae in 

 having two intestinal diverticula. Tornquist (1931) erected a new 

 genus GucuUaneUus for a group of small spindle-shaped cucullanids, 

 which differ from typical members of the genus Dichelyne in having 

 a ventral instead of a dorsal diverticulum. The present species, 

 with both a dorsal and a ventral diverticulum and a body form inter- 

 mediate between that typical of Dichelyne and CuGullaneUus., re- 

 spectively, makes it appear unjustifiable to separate these two genera, 

 and Cucullanellus is, therefore, reduced to the rank of a subgenus of 

 Dichelyne. 



INCERTAE SEDIS 



AGAMONEMA IMMANIS, new species 



Plate 11, Figures 11-13 



Speci-fiG diagnosis. — Very long, cylindrical, and blood-red except 

 in esophageal region, which is whitish and clearl}^ differentiated. 

 Length 110 to 155 mm, with maximum diameter of about 900/t. 

 Anterior end bluntly rounded, with no distinct lips, but with minute 

 boring tooth. Vestibule about 200/t long. Esophagus 20 mm long, 

 about 200/t broad at anterior end, gradually widening to nearly 600/i, 

 where it almost fills space inside of body. Posterior end with chitin- 

 ous rectum about 1 mm long, 200/'. wide where it joins intestine, and 

 about 40/1 wide at anus, which is terminal (pi. 11, fig. 13). 



