THE SCOLEX POLYMORPHUS 837 
show so many that one could not fairly claim any reduction as a 
result of the treatment. When, however, those specimens which 
were killed when they seemed in bad condition are taken into 
account, it is evident that many worms must have been elimin- 
ated, and the results indicate the elimination of many of the 
parasites from this lot of sharks, probably of all of them in those 
sharks which died from the treatment, but they also indicate that 
the dose as here given cannot be relied upon. 
TABLE 4 
12 sharks, captured before July 2, kept without food 
| 
vars AR an i gumonne | euanes 
July 28, each shark given 2 cc. oil of male fern 
July 29, each shark given 3 cc. calomel 
Augusts0)...... No. 1 Dying No worms Traces of oil 
and calomel 
in gut 
Aust: Wore No. 2 Killed No worms Gut normal 
ATICUStr ones No. 3 Killed No worms Gut normal 
Aust: 4-22 -ee No. 4 Killed No worms Gut normal 
Aumust 16oe ace " No. 5 Dead No data Decomposed 
Aurusth dd! . 2: No. 6 Killed 1 C. laciniatum, scolex 
AIOIStel en ee No. 7 Killed 3 C. angustum, small 
3 C. laciniatum, small 
August 18, the five surviving sharks each fed on shark’s flesh 
7 eee Be ee At : 
August 28....... | No. 8 | Dead No data | Decomposed 
| 
| 
August 29....... No. 9 Killed 1 C. laciniatum, small 
August 30....... No. 10 Killed 2 C. laciniatum small found 
at very anterior end of 
| spiral valve 
August 30....... J "Nott | Killed No worms 
AUpUStisOn se No. 12 | Killed 2 C. laciniatum, large and 
with ripe proglottids 
1 C. laciniatum, small 
