Oxyspirufa mansoni — Schwabe 
21 
I 
Fig, 1. Photomicrograph showing the anterior end of 
an adult Oxyspirura mansoni. 
white, thread-like worm attenuated at both 
the anterior and posterior ends. Adults 
studied in the laboratory measured from 9 to 
17 mm. in length (Tables 1 and 2). The pos- 
terior end is more slender and in the male is 
curved ventrad. The thin, transparent, outer 
cuticle is smooth; neither transverse nor 
longitudinal striations were discernible on 
worms studied. Magalhaes (1888) reported 
fine transverse striations; these were not ap- 
parent to Emmerez and Megnin (1901) or to 
Ransom (1904). 
The following papillae are common to both 
sexes: a small cervical papilla with a short 
hair-like process located on each side of the 
body approximately 440 ju from the anterior 
end; a pair of small latero-caudal papillae near 
the posterior extremity of the tail; six minute 
oral papillae; and four large sublateral cepha- 
lic amphids. In the male, six pairs of papillae 
Fjg. 2. R'-Oph ’’Ik', rli-: ead 
of :ia .)d(]|r rn di. Oxy'iJ'it .n - ".tL'.iyh 
suriOLind tlie cl«j.iCjl opeijing. Iciur p.ars pre- 
ana 1 and twt'» pjit’s postan.il. 
I'he rruisck arr.ingeirM^r,*- i-; of rlv;- poly- 
rnyarian type, witii a tan-blic M-Tangeirient of 
muscle fibers in the an.d iegi<-u of Lk.i.!! rhe 
male and the fem.de, .irucljin*r the lectunj to 
the dorsal wall. 
Fig. 3. Photomicrograph showing the posterior end 
of an adult female Oxyspirura mansoni. 
