26 
Transactions of the Society. 
under favourable conditions this can be so, but otherwise the 
growth may be very slow, as in the present case. 
I examined the intestines of these eels for intestinal parasites, 
which I forwarded to Dr. Baylis, of the Natural History Museum, 
who kindly classified them for me. He found the following, all 
previously found in the eel : — 
Ptychobotuum claviceps (Goeze, 1782). 
Echmorhynchus salmonis (Muller, 1784). 
Ascaris cristata (v. Linstow, 1782). 
I take the opportunity to thank Dr. Baylis most sincerely. 
I also thank Mr. C. Tate Regan, F.R.S., Keeper of Geology, British 
Museum, who very kindly allowed me to prepare some of the 
otoliths in the Museum laboratory. 
The readers who wish to know more about the determination 
of growth of the eels by means of the otoliths can consult the 
following papers : — 
1. Ehrenbaum, E., & Marukama,H. — Uber Alterbestimmung und Wachstum 
beim Aal. Zeitschr. fur Fischerei, Bd. 14, 39-127 (1912). 
2. Haempel, O., & Neresheimer, E.— Uber Altershestimmung und Wach- 
stum des Aals. Zeitschr. fur Fischerei, Bd. 14, 265-81 (1914). 
3. Marcus, K. — Uber Alter und Wachstum des Aales. Aus Mitteilungen 
aus dem Zoologischen Museum, Bd. XXXVI (Hamburg, 1919). 
4. Wundsch, H. — Neue Beitrage zu. du Frage nach dem Alter und Wach- 
stum des Aales. Zeitschr. fur Fischerei, Bd. 18, 55-88 (1916). 
