166 
Transactions of the Society. 
IV. — On the Male of Stephanoceros Eichhorni. 
By F. B. Dixon-Nuttall, F.B.M.S. 
(Bead 19 th February, 1896.) 
Plate Y. 
Although the female of this charming Botifer has been known since 
1761, when on the 20th July of that year it unfolded its corona 
before the astonished eyes of Pastor Johann Conrad Eichhorn, of 
Danzig, and although it has been seen and closely watched by 
thousands of observers since, the male has only been discovered in 
recent years by Mr. John Hood, of Dundee, and made known by 
Mr. George Western in the Journal of the Quekett Microscopical 
Club for July 1893, vol. v. pp. 157-8. 
Early in January 1895, Mr. Hood sent me a quantity of Stepha- 
noceros Eichhorni , with many male eggs, which are more numerous 
and smaller than the ordinary female eggs, in the tubes, and I was 
successful in hatching a number of them in a small trough, thus 
enabling me to make the accompanying sketches of them. 
Like most male Botifers, they are restless, and swim about in an 
apparently aimless manner. 
The dorsal antenna is situated on a small hump, and at each side 
of it lie the lateral antennae. In some animals these are furnished 
with a bunch of long fine setae, though in several examples that I 
looked at most carefully I was unable to find them; it is possible 
they may get broken off. 
The many-celled sperm-sac (in which may be seen the spermatozoa 
actively lashing their flagella) takes the place of the stomach and 
intestine. The vascular system, with its contractile vesicle, is normal. 
The corona is circular, and furnished with a wreath of fine vibratile 
cilia ; the front of the head is conical, and two red eyes, rather wide 
apart, are conspicuous. 
Owing to their flexible nature, it is difficult to fix the exact size. 
I put it down at 1/90 in. to 1/80 in., though they can elongate to 
1/60 in., or even longer. 
EXPLANATION OF PLATE Y. 
Fig. 1. — Lateral view. 
„ 2. — Dorsal view. 
