2 PROCEEDINGS OF THE NATIONAL. MUSEUM tol. 68 



pendix one-third as long as esophagus. Cloaca 390ju before posterior 

 extremity of worm, which bears a conical appendage 120,u long. 

 The usual pair of double papillae are situated lOO^t behind the cloaca 

 and are separated by an interval of 85ju. Outside the double papil- 

 lae and extending some distance before and behind the cloaca is, on 

 each side of the worm, a group of twenty-seven papillae. Of these 

 ten are behind the transverse level of the cloaca. Just before the 

 caudal appendage there is a median group of eight papillae, arranged 

 in two rows of four each. Extending forward from each lateral 

 group of papillae is a row of about twenty papillae, the last member 

 of which is about ten millimeters in front of the cloaca. The spic- 

 ules are very long; the right measures 12 mm., the left 11.8 mm. 



Female: Length 62 mm., greatest diameter 2.8 mm., near middle 

 of body length. Lips similar in form and arrangement to those of 

 the male, lips ISOju high, interlabia slightly less. Labial papillae as 



Figs. 1-2.— Contracaecum tueoidum. l, Front view of head. 2, Caudal extremitt of male 



in male. Amphids and excretory pore as in male. Cervical constric- 

 tion 105,u behind bas(fof lips. Esophagus 6 mm. long, relative lengths 

 of the appendices as in male. Vulva near anterior third of body 

 length, vagina short, oviduct thick and muscular, about 2 mm. long, 

 bifurcating to form two voluminous, thin walled uteri both of which 

 are directed posteriad. Anus 800^ before the porterior extremity. 

 Tail conical, rapidly narrowing to the caudal spike which is 15/i in 

 length. Eggs spherical to ovate, averaging 60^t by 54ju, with smooth 

 thick shells. 



Habitat. — In stomach of Monachus schauinslandii, April 8, 1923, 

 Alex. Wetniore. 



Locality.— H.a.w All, Laysan Island. 



Type.—V. S. N. M. Helminthological Collection No. 26202, Para- 

 types No. 26203, and in the collections of the Bishop Museum. 



It may be noted that in the above-described species, as well as in 

 all other species of this genus that the writer has examined^ the 



