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PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 50. 



lumen, in T\'hich is a complex apparatus apparently for masticatory 

 purposes. The esophagus is very long, 1/3.3 of the total body length, 

 and terminates in an esophageal bulb provided with valvular teeth. 



31ale unknown. 



Female 5.6 mm. long and 2 mm. thick [sic!]. The long pointed 

 tail is one-fourth of the body length. 



Host. — BIyocastoT coy pus {Myopotamus coy pus). 



L ocation. — Intestine. 



Locality. — Stuttgart Zoological Gardens. 



Von Linstow states that this species can not be confused with any 

 known species. It is unfortunate that he does not give an interpreta- 

 tion of the buccal and esophageal structures, as these things can 

 seldom be evaluated as well from drawings as from the specimens 

 themselves. Von Linstow states that the female is 2 mm. thick, but 

 it seems likely that this should have been 200 /x, thick if the length, 

 5.5 mm., is correctly stated. 



OXYURIS OBESA Diesing, 1851. 



SpeciiiG diagnosis. — Oxyuris (p. 65) : Head with six papillae 

 anteriorly (fig. 93), the submedian papillae with a knob on the tip. 



The mouth aperture is cir- 



cular and posterior of the 

 aperture, and inside the buc- 

 cal capsule are six cuti cular 

 folds with curved margins. 

 The cuticle of the head is not 

 i n fl a t e d . The esophagus 

 terminates posteriorly in an 

 esophageal bulb bearing a 

 tooth apparatus. 

 Male unknown. 

 Female attains a maximum 

 length of 2.8 to 3 cm. long. 

 The posterior extremity is 

 straight, subulate, and almost 

 as long as the remainder of 

 the body (fig. 94). The anus 

 is about 1.6 cm. from the end 

 of the tail. The vulva is 

 about 8 mm. from the an- 

 terior end. The eggs are 



thick shelled, elliptical, and without depression. Females 7 mm. 



long have the sex organs developed and apparentl}'' are fertilized, 



since the vulva bears a brown plug. This plug is not present in older 



specimens. 



Fig. 93.— Oxyuris obesa. a, Head vie'wed from 



TUE TRONT; 6, CROSS SECTION OF ESOPHAGUS; C, 

 CROSS SECTION OF ESOPHAGUS POSTERIOR OF 6 ; (i, 

 CROSS SECTION OF ESOPHAGUS POSTERIOR OF C. EN- 

 LARGED; 6, c, AND d X S3. After Schneider, 

 1866. 



