Contributions to the Natural History of Old Calahar- 159 
Delphinus (sp. ?) 
Mr Oliphant has received the head of a species of dolphin. 
Bhinomus soricoides. — (Nov. Gen., Nov. Sp. 1) — Murr. 
This is a very puzzling little animal. It has the appear- 
ance of a shrew, with its long snout, but is in reality a mouse. 
Its dentition is somewhat peculiar, the incisors having a pro- 
cess behind them, like the cusp of a carnivorous tooth. It is 
pentadactylous both before and behind, and as all the allied 
genera and species have four fingers before and five behind, 
Mr Murray considered that there was no alternative but to 
make a new genus for its reception, and in reference to its 
long snout, he proposed the above name for it. 
It is mouse-coloured, with ear and tail. 
IV. On the ChalJc Flints of the Island of Stroma^ and Vicinity of 
John o^Groafs^ in the County of Caithness. By Charles W. Peach, 
Esq., Wick. 
Notices of the occurrence of chalk flints in the boulder clay 
of Caithness have from time to time appeared in various pub- 
lications. Many of the localities I have been able to verify, 
and to add new ones as well. Knowing the interest attaching 
to their presence so far north, and not being able to find any 
account in any work that I have access to of their having 
been found on the surface of the land, the intent of this 
communication is to show that I have been fortunate enough 
to make that discovery. 
On the 5th instant I had to go to the island of Stroma on 
business. When walking across the north side of it, I was 
somewhat surprised to find chalk flints in considerable abun- 
dance on the surface there. This part of the island is stripped 
of its turfy covering, and is consequently favourable for obser- 
vation. Wherever I went, even on ploughed land, and where 
the short vegetation was not too thick, I met with the flints. 
They vary in size from that of a boy's marble to eight or ten 
inches over, and are generally of a light colour. Some con- 
tain sponges ; in most of them spicula may be seen in thin 
splinters, which I chipped ofl", and in one piece I observed 
those hollow and branched spicula with the small ball- like 
