72 NORTH AMERICAN 



its posterior extremity is three-fourths as wide as the base of the neck. 

 There is no definite cardia. The lining of the oesophagus is indistinct. The 

 intestine, which is separated from the oesophagus by an obscure constriction, 

 becomes at once three-fourths as wide as the body, is rather thick walled, 

 and its cells contain rather uniform, colorless granules, not arranged in any 

 definite manner. From the rather raised anus the conspicuous rectum, which 

 is twice as long as the anal body diameter, extends inward and forward. 

 The tail is conoid, but tapers more rapidly near the acute terminus. A short 

 distance in front of the terminus it is nearly half as wide as at the base. 

 Nothing is known concerning the renette. The lateral fields have not been 

 distinctly seen, but they appear to be about one-third as wide as the body. 

 Nothing definite is known concerning the internal sexual organs, as the speci- 

 mens examined were not fully developed. 

 60. 



.4 6. IQ. -M- 92. 



- 1.4 mm. 

 .5 1.2 1.4 2. 1.2 



The tail of the male is like that of the female in form and size, 

 except that the anus is more prominently raised. In front of the anus 

 and extending forward to the base of the neck there is a ventral row of 

 ninety supplementary organs. These are of small size, and each ap- 

 pears when seen in profile to be a slight conical, innervated elevation 

 having an altitude about one-third as great as the width of its base. 

 These organs are removed from each other a distance on an average 

 about equal to the radius of the body or a little more. They are some- 

 what nearer together posteriorly than anteriorly. Near the base of the 

 neck the distance between two adjacent organs is about equal to the 

 body diameter. The two equal, tapering, acute, nearly straight spicula 

 are about one and one-third times as long as the anal body diameter. 

 They are slightly cephalated by expansion, the cephalum occupying 

 about one-third of the length. At the widest part, namely in the cephala, 

 the spicula are one-fourth to one-third as wide as the corresponding 

 portion of the body. They do not appear to have any accessory pieces. 

 The spicula appear, when seen in profile, to be arranged at an angle 

 of forty-five degrees to the body axis. Beginning at the anus and ex- 

 tending obliquely backward there is a strand of muscle which is at- 

 tached to the dorsal side of the body. The two testes are outstretched 

 in opposite directions. The blind end of the anterior testis is about as 

 far behind the base of the neck as the nerve-ring is in front of it, while 

 the blind end of the posterior testis is about twice as far in front of 

 the anus as this latter is in front of the terminus. 



Habitat: Fresh water, Tynne Station, Fla. Bouin solution to gly- 

 cerine. 



