557 
Prof. Milne — Across Europe and Asia. 
two mav be separate«!. Fig. 19 represents the specimen originally 
figured by Prof. Seeley, which is lent to me by the kindness of tbe 
Curator of the Woodwardian Museum. Fig. 21 is a drawing of 
Crepidula alta, Seeley, wliich still remains an unique and perhaps a 
distinct shell, although I hesitate to accept it as such in a group, the 
individuals of which are liable to such extreme Variation. Curious 
instances of this Variation occur in the apertures of Fusus longcevus 
from the Paris Basin, in the British Museum, in which Capulidce are 
flattened and even take the crescentic form of the aperture of that shell. 
Fig. 3 a represents Crepidula gaultina, considerably enlarged and 
looking down upon it, and sliows the helicoid apex which Dr. J. 
Gwyn Jeffreys notices as being common to all the limpets. In this 
species it is especially persistent, and is very distinctly visible in the 
cast, and also, but less so, in the perfect shells from Folkestone. 
Fig. 66 is the apex alone, and shows the fine transverse ribbing 
with which it is always internally ornamented. Figs. 6a, 8a, 86 
are other views showing the position of the helicoid apex, but are 
enlargements of shells said to be Calyptrcea Coolcsonice. Fig. 4a is a 
view looking down upon C. gaultina. Fig. 46 shows the crater-like 
scar, highly magnified, which is left on the cast after the removal of 
the helicoid spire. This is the imperfect state in which most 
specimens are found. 
The great variety of scar left after the removal of the septum 
is well seen in this series. As I am informed by Mr. Jesson and 
the Rev. Arthur Buxton that the casts of these shells are abundant, 
when diligently searched for, in the apertures of Cephalopods in the 
Cambridge beds, there will be no difficulty in confirming the correct- 
ness of my proposal to unite the several forms in a single species. 
In this case Buvignier’s name would have priority. 
Fig. 22 represents Braclujstoma angularis, Seeley. The genus was 
proposed by me in this Magazine last year to receive this rare shell, 
and is placed in the family of Aporrhaidcc. I had then no space to 
figure the Cambridge specimens (two in number), which are now 
in the Woodwardian Museum, and I embrace this opportunity of 
figuring one of them, as they are of larger size than the still unique 
specimen from the Gault of Folkestone. 
VI. — Across Europe and Asia. — Teavelling Notes. 
By Professor John Milne, F.G.S. ; 
Imperial College of Engineering, Tokei, Japan. 
(Continued from p. 518.) 
VII. — Irkutsk to Lake Baikal. 
Contents. — Irkutsk ; its Earthquakes — Gold-washing in Eastern Siberia — Method 
of sinking to the bottom of a river tkrough a sbaft of ice — Koad to Lake 
Baikal — Round its Southern end — Old lake-terraces — Its former extension — 
Origin of its basin — Bearing of its Fauna on its origin — Is it a pool left bebind 
a flood ? 
W HILST in Irkutsk I had many opportunities of conversing 
about the earthquakes which sometimes disturb these Central 
Asian localities. Not long before my arrival in the town, a sharp 
shocks had been experienced. The general effect it produced was 
