2 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 63, 



followed by a barely distinct esophagus, the distance from the pos- 

 terior border of the pharynx to the inner border of the intestinal 

 ceca about one and one-half times diameter of ceca. Intestinal ceca 

 long and not quite equal, the left one longer, reaching to about one- 

 tenth of body length, the right one to one-fifth, from posterior end. 



Ovary, from 0.32 to 0.36 mm. in diameter, situated just behind 

 ventral sucker and partially overlapping it, slightly displaced toward 

 right side, its center 1.5 mm., or about one-third of body length, from 

 anterior end. A flask-shaped seminal receptacle lies just posterior 

 to the ovary, also toward the right side, occupying the space between 

 ovary and anterior testis. Ootype and shell gland not clearly visible, 

 since they are covered ventrally by the seminal receptacle and 

 dorsally by the egg-filled coils of the uterus. Transverse vitelline 

 ducts receive anterior and posterior forks on either side, in region 

 of intestinal ceca. Vitelline glands on left side more extensive than 

 on right, extending from a level just behind anterior border of 

 ventral sucker to level of posterior border or posterior testis on right 

 side, and to junction of second and ternjinal thirds of body on left 

 side. Uterus, irregularly coiled and filled with very numerous eggs, 

 passes posteriorly from the ootype on the left side in three specimens, 

 on the right in one, crosses to the opposite side usually at some dis- 

 tance from the posterior end, although loops pass back to the ex- 

 treme tip, and ascends, crossing diagonally back to the left side, it 

 not already there, in the region of the testes, continuing forward a 

 little to the left of the midline to the anterior border of the ventral 

 sucker, thence following the cirrus sac to the genital papilla at the 

 extreme anterior end. Testes nearly round, one directly behind the 

 other in median line, and in contact or nearly so ; anterior one about 

 0.41 to 0.48 mm. in diameter, posterior one about 0,39 to 0.47 mm. 

 Cirrus sac long and flask-shaped, its posterior end, at level of 

 ventral sucker, bending toward the dorsal side. It crosses diago- 

 nally under the left intestinal cecum and, becoming narrow, turns 

 forward, inward, and dorsad to open, in common with the vagina, 

 on a papilla at the antero-dorsal extremity of the worm. Excretory 

 system with thick muscular walls around pore, into which opens a 

 broad reservoir. Eggs thick-shelled, yellow, relatively small: in 

 mounted specimens, where they are more or less collapsed, they 

 measure about 26[x by 13[jt.. 



Hohitat. — Middle portion of intestine of AmpMuma means^ from 

 Louisiana. 



T'y;;^.— Deposited in United States National Museum, Helmintho- 

 logical Collections, No. 25171. 



Cephalogonmms amphiumae is a typical representative of its 

 genus. Including the present species, seven species have now be?n 

 described in the genus, but one, Cephalogonimus trachysauri Mac- 



