150 MARIE. V. LEBOUR. 
in 1897 I searched through samples of various dates, particularly 
autumn, winter and spring, without finding any trace of 
B. sinensis until October, 1909, when it suddenly became abun- 
dant and continued so within the limits of its seasonal range as 
is shown in these records until the present time. It is. very 
distinct and easily recognised and I find it hard to believe it is 
not a true species distinct from mobiliensis and regia. It occurs 
with them and is easily distinguished from them, and this year 
continues to stay longer than the others. The fact also, quoted 
by Herdman, that Dr. Allen and Mr. Nelson grew cultures of all 
three forms, which bred true for a year is strong evidence in 
favour of their being separate species. In some samples taken 
by Dr. Garstang in 1897 P. mobiliensis and regia were common, 
U 
lic, 6.—Varieties of Biddulphia regia. x 60. 
and amongst these I found an occasional specimen which showed 
an approach to sinensis. 
The figures (Fig. 6) were drawn with the camera lucida, and 
are very like some of Herdman’s figures. Although, however, one 
end is decidedly like sinensis and the cell is elongated (probably 
soon going to divide), I think these are varieties of regia only and 
not true sinensis species. It seems from this that occasionally 
B. regia can show varieties approaching B. sinensis and perhaps 
this is the explanation of Herdman’s mixed forms. If this 
explanation be correct we thus find B. sinensis appearing at 
Plymouth suddenly in October, 1909, and at Port Krin in 
November of the same year. The difficulty as to its origin is still 
a puzzle. 
(47) Biddulphia mobiliensis (Bail.) Grun. Begins to be abundant in the 
midd’e of November, keeping up its numbers until the end of 
March, is scarce in April, finally disappearing at the end of the 
month, not to reappear until the middle of August and then only 
singly. 
(48) B. regia M. Schulze. Much the same as B. mobiliensis but not quite 
so abundant and disappears earlier. 
