Z PROCEEDINGS OF THE NATIONAL MUSEUM vol. 81 



Genus CREPIDOBOTHRIUM Monticelli, 1900 



Generio diagnosis. — Scolex with or without apical organ of vari- 

 ous shapes, never with a rostellum armed with hooks. Surface of 

 scolex and suckers sometimes covered with spines. Testes in two 

 lateral fields with an occasional tendency to coalesce anteriorly. 

 Vagina anterior or posterior to cirrus sac, usually with a well-devel- 

 oped sphincter. 



Type species. — C. gert^ardi Baird, 1860. 



CREPIDOBOTHRIUM AMPHIUMAE. new species 



Specific diagnosis. — CrepidohothriuTn: Length up to 25 cm. Scolices 

 280/A to 640/A long by 400/a to 480ju, wide. Apparently no apical organ 

 is present. Sucker IQOjx in diameter. Strobilization is marked in 

 two compressed specimens at 60;n and 180/x, from the scolex. The im- 

 mature proglottids at a distance of 6 mm from the scolex are 300/i 

 long and 720/* to 810/x wide, when prepared with some compression. 

 The mature proglottids (pi. 1, fig. 6) at a distance of 25 cm from 

 the scolex are 800/i, to 1.04 mm long and 960/a to 1.52 mm wide. The 

 ripe, or gravid, proglottids (pi. 1, figs. 7, 8) are 1.6 mm to 1.9 mm 

 wide and 4.4 mm to 4.6 mm long. The genital pore is in the an- 

 terior fifth of the gravid proglottid. There is a common sinus for 

 the openings of the cirrus sac and vagina. The genital opening al- 

 ternates irregularly. The cirrus is frequently protruded. (PI. 1, 

 fig. 4.) The cirrus is unarmed. The cirrus pouch is 320/a to 490/I, 

 long and 80/x to 160/a wade. The genital ducts lie between the excre- 

 tory ducts. The vas deferens consists of three coils within the cir- 

 rus pouch and several outside. Testes are about 50 to 70 in number, 

 in each field on both sides of the uterus with a few approaching the 

 midline. The vagina is always anterior to the cirrus pouch; it does 

 not cross the pouch and is without convolutions. The ovary in the 

 ripe proglottid has an anterior-posterior length of 830/t. There are 

 about 50 to 65 uterine pouches on each side. A uterine pore is preseni 

 in the posterior part of the proglottid. 



Host. — Aviphiuma tridactylum . 



Location. — Middle intestine. 



Distribution. — Louisiana. 



Ty2->e speci7nen.—\J.S.'^.M. Helm. Coll. No. 8118. 



Remarks. — Crepidohothrium aviphiuniae as just described falls 

 within group E of the genus according to Meggitt (1927), because of 

 the number of uterine diverticula (100 to I'ii)), which exceeds 25, and 

 the number of testes (100 to 140). G. lonnbergii has approximately 

 the same number of testes, but the vagina and cirrus alternate in posi- 

 tion, the uterine diverticula are less, and an apical organ is present. 



