THE SCOLEX POLYMORPHUS 839 
It so happened that no shark, in which the Crossobothria sur- 
vived, was killed among the first in any lot; as may be seen by 
reference to the dates on tables 1, 2, 3, 4 and 5. Thus by the 
11th of August my records showed thirteen sharks which were 
killed when in perfectly good condition, six others which were 
killed, when it seemed that they were likely to die, and seven 
others, which died from the treatment and in not one of these had 
I found a single living Crossobothrium. This seemed to demon- 
strate the effectiveness of the single treatment with the oil of 
male fern, which was therefore continued, the sharks which sur- 
vived it being kept for infection with the 8S. polymorphus. Later, 
when sharks began to appear in which some of the worms had 
survived, the season was so far advanced that there was neither 
TABLE 6 
9 sharks, captured August 6 to 9, kept without food 
NO. GIVEN SHARE 
IN THIS SERIES 
CONDITION OF 
SHARK AT DEATH 
CESTODES IN 
E oI 
BL SPIRAL VALVE | “OREN ESS) 
August 18, all sharks given 2 cc. each of oil of male fern 
August 19, all sharks given 3 cc. of calomel 
August 19, dead Crossobothria from anus of one specimen in handling 
August 30... 7 | No. ill Dead No worms | Decomposed 
| a little 
August 30....... | No. 2 | Alive No data | Escaped 
August 30, ave the seyen survivors 3 cc. each of oil of male fern 
es i Te eae Be ES iceable 
d INO Worms No noticea 
September 1..... No. 3 Dea decomposi- 
| | tion : 
| iceable 
d No worms No noticeal 
September 1....-| Neem e decomposi- 
tion 
1 
Killed No worms Gut norma 
September 2...-. No. : aa ed No worms Gut normal 
September 2...-- No. : Killed No worms Gut normal 
Ssptember 2...-- No. : Killed No worms Gut normal 
September 2...-- No. ate Sirens Gut normal 
September 2...-. No. 9 
