7000 



6000 



5000 - 



C4000 



X 



y 3000 



2000 - 



1000 - 



II 21 

 NOV 



II 21 

 DEC 



I 21 

 JAN 



II 21 

 FEB 



II 21 

 MAR 



II 21 

 APR 



II 21 

 MAY 



II 2! 

 JUN 



II 21 

 JUL 



II 21 

 AUG 



Figure 12. --Weights of 3,985 ftir seal fetuses plottsd by 10-day periods for 1958-62, 



Anomalies . — Each year since 1958, one or 

 more seals carrying twins were collected as 

 shown below: 



In 1962, twins were found on 11 June in a 

 16-year-old female. The ovary of the pregnant 

 horn (figs. 14-17) contained two corpora lutea. 

 The male fetus was larger (55.0 cm. long and 

 weighed 4.6 kg.) than the female fetus (53.0 

 cm. long and weighed 4.3 kg.). The average 

 male fetus collected during this same 10-day 



period was 60.4 cm. and 5.6 kg. The average 

 female was 57.8 cm. and 5.0 kg. 



The last pregnant seal was taken on 11 

 August. A 21-year-oldfemale carried a normal 

 sized female fetus. None was taken between 

 26 July and 11 August. 



Pedunculate barnacles are occasionally 

 found attached to fur seals (Scheffer, 1962). 

 In 1962, two fur seals were collected with 

 barnacles attached to their fur. Lepas pectinata 

 was found attached to the individual guard 

 hairs of the neck and back of an adult female 

 collected in Unimak Pass on 28 June. Lepas 

 anatifera was found attached to guard hairs 

 behind each ear pinna of a young male fur 

 seal collected about 18 miles northeast of 

 St. Paul Island on 27 July. Individual barnacles 

 of both species of Lepas were smallj the 

 capitulum of the largest did not exceed 5 mm. 

 The barnacles were identified by Dora P. 



34 



