PARASITES OF GALVESTON BAY FISHES — CHANDLER 147 



lonfi. with maximum diameter, at posterior end of esophagus, of 

 390/i. Esophagus 7'20;u, h)ng, anterior portion about 320/li long. Di- 

 ameter 180/1. across expanded anterior end, 78/x at narrow neck, 

 where anterior and posterior parts join, 135/ii, across bulb. Lips 

 170/x broad, with finely fluted rather than serrated margins, and 

 three papillae. Intestinal diverticulum reaches to about junction 

 of two parts of esophagus. Vulva situated 58 percent of body 

 length from anterior end. Anus about ISOju, from tip of tail. Tail 

 conical, about 5C)/x broad at anus, terminated by spine, which, as 

 pointed out by Van Cleave and Mueller in the case of T). rolntsta^ 

 apparently has the structure of a sensor}' papilla. About in middle 

 of postanal region a pair of conspicuous lateral papillae. Male 

 5.75 mm long, with diameter of about 380;li. Esophagus 675/a long, 

 136/x broad at expanded anterior end, 70/a broad at neck, and 100/i. 

 broad through bulb. Cloaca 135/a from tip of tail, with conspicuous 

 lips. Caudal papillae arranged much as in D. cotylophora. Four 

 pairs of papillae i)ostanal, three pairs adanal, and four pairs pre- 

 anal. Most posterior pair of postanal papillae ventral near tip of 

 tail, next pair dorsal, next pair lateral, and next pair ventral. Two 

 pairs of adanal papillae large and ventral, situated on sides of genital 

 prominence immediately in front of and behind cloacal passage; 

 third pair small and situated laterally. First pair of preanal pa- 

 pillae situated close to anterior pair of adanal papillae, other three 

 pairs spaced out roughly 150/*, 400/x, and 700/x from cloaca. Ventral 

 sucker practically absent, although its position is faintl}'^ indicated 

 by slight flattening in curvature of body. Spicules about 1 mm 

 long, tubular, 30/i broad near base, and about 10/x broad near tip. 

 Tip beveled off like tip of a hypodermic needle. A well-developed 

 troughlike gubernaculum present, about 120/* in length. 



Type host. — Sciaenops ocelJutus. 



Location. — Intestine. 



Locality. — Galveston Bay, Tex. 



Type spedvwn.—V.^.'^M. Helm. Coll. 39543. 



Remarks. — Only two individuals of this species were found, a 

 male and a young female. The species closely resembles D. cotylo- 

 phora ("Ward and Magath, lOlG) but differs in the absence of the 

 ventral sucker, in the somewhat longer spicules, in the slightly 

 diflerent arrangement of the caudal papillae in the male, and in the 

 considerably greater diameter of the body relative to the length. 

 In the thickness of the body and absence of a sucker it resembles 

 />. rolusta (Van Cleave and Mueller, 1932). but differs from that 

 form in the length of the spicules and arrangement of caudal papillae 

 in the male. It differs from D. fossor Jagerskiold, 1902, in its 

 smaller size, shape of esophagus, presence of cloacal lips, form and 



