F. J. Meggitt 
397 
nensis Kowal. (5) has previously been recorded, a description of which 
I have not yet been able to obtain. Should this variety prove to be 
the same as the form under discussion, this name would of course have 
priority. In the meantime I propose the name D. dubius provisionally 
for the new form. 
TABLE I. 
1 row of hooks upon 
suckers 
4r- 6 rows of hooks 
upon suckers 
Second segment contains vitelline 
gland and functional male 
organs 
Second segment contains only 
the “Anlage” of the male 
organs 
D. proglottina 
Third segment contains functional 
female organs. Only cirrus-sac 
remains of the male organs 
Fourth segment contains only 
eggs 
New form ... 
Third segment contains functional 
male organs and “Anlagen” of 
vagina and receptaoulum sem- 
inis 
Fourth segment contains func¬ 
tional female organs and testes. 
Eggs not mature until seventh 
segment 
D. proglottina 
Testes “disposees dans les parties 
laterales de l’anneau*.” A vesi¬ 
cular seminalis absent 
“La glande coquillere n’est pas 
apparente,non plus que 1’uterus” 
New form ... 
Testes in two rows along the pos¬ 
terior margin of the proglottis. 
Vesicular seminalis absent 
Shell-gland present. Uterus pres¬ 
ent although not persistent 
Specific Diagnosis. Length of strobila 3 mm., width 0-6 mm. Head, 
0-16-0165 mm. long by 0-13 mm. wide, with retractile rostellum, 
0-041 mm. diameter, armed with two rows of 30 hooks each, those in 
one row being 71/x long, in the other 84. Suckers shallow, 0-045 mm. 
diameter, armed with 4-6 rows of hooks 52—86 yu, long. Neck short. 
Number of proglottides usually seven. Genital pores regularly alternate, 
at the anterior angle of the proglottis. Testes 12-15, in two rows along 
* In the figure of the second segment given by Blanchard (1) the testes are represented 
as being uniformly distributed throughout the proglottis. See Text-figure 1. 
26—2 
I), proglottina No attached pi’oglottides longer 
than broad 
New form ... 4 attached proglottides longer 
than broad 
D. proglottina 5 proglottides present 95 rostellar hooks ... 
New form ... 9 proglottides present 50-60 rostellar hooks 
