of Edinburgh, Session 1878-79. 
113 
lowed out. If, however, the number and arrangement of the nasal 
sacs, as forming an element in the determination of the affinities 
of different Cetaceans, is deserving of the importance attributed 
to them by some writers, those of Beluga certainly seem to 
associate that genus with Monodon, and to separate it from the 
other genera above named. It should, however, he noted that the 
sub-division of the trachea into four bronchi in Monodon is widely 
different from that which obtains in Beluga and in every other 
toothed whale of which we have any knowledge, with the single 
exception of Pontoporia. In view of the scantiness of information 
regarding the anatomy of Monodon, the determination of the exact 
affinities of Beluga must be left to future observers. 
2. Fifth Eeport of the Boulder Committee. 
The Committee had submitted to them Notes by the Convener of 
two visits to the West Highlands (including the Outer Hebrides) 
which he had made during the summer and autumn of 1878. These 
Notes, accompanied by diagrams of boulders and striated rocks, afford 
a large amount of information bearing on the subject of boulder 
transport, the direction of transport, and the agent of transport. 
There has also been laid before the Committee a report by 
William Jolly, of Inverness, one of its members, “ On the Transpor- 
tation of Bocks found on the Shores of the Moray Firth;” as 
also Notes by Messrs Somervail and Henderson (Edinburgh), “ On 
Boulders and Striated Bocks in the Pentland Hills.” 
The Committee have had an opportunity of seeing these Notes 
and Beports in printed proof sheets. The Convener, on his own 
responsibility, sent the MSS. to the printer; and the Committee 
approve of his having taken this course. 
Notes by Convener of two Visits to the West Highlands and 
Hebrides in Summer and Autumn of 1878. 
i . — island of IONA. 
The Convener having occasion to be in this island for a few 
hours, went to the boulder referred to in the Committee’s Second 
Beport, situated on the west side of Dun-Ii hill. 
Its peculiar position appearing to him to deserve a more special 
notice, he gives in fig. 1 a sketch of it taken from the north. 
