138 
Saxicava arctica, Mya truncata, and Mytilus edulis 
appear in forms peculiarly distorted, in a way which it is 
usual to attribute to exposure, during intervals, to greater 
or less infusion of fresher or colder water. This may be 
supposed to he due to some direction of the currents of the 
old land streams, probably coming down from glaciers, over 
shellbeds, not far from shore, and at no great depth. The 
variation of Mya truncata from some such cause has given 
rise to the form known as M. Uddevallensis. 
Dr. Thomas Alcock has kindly examined three parcels of 
sand, and reports finding the following species ; 
Kapellebacke 
From sand 
in Modiola. 
n— high level- 
From sand 
in Echinus. 
Brache— lower. 
From sand 
among shells. 
Polystomella umbilicatula.. 
% 
Miliolina seminnlum 
# 
* 
,, trigonula... 
Botalina turgida (?) 
% 
# 
Truncatulina lobatula 
* 
Another form 
# 
Mollusca, fry of 
Ostracoda 
3 
2 
3 
The specimens are all of strong kinds, and appear much 
worn. They were not common in any parcel. 
Mr. John Plant made the following remarks, being 
addenda and corrigenda to the list of shells already 
published, found in Cymmeran Bay, Anglesea. 
List of Shells found in Cymmeran Bay, Anglesea. Cor- 
rections and Additions, by John Plant, F.G.S. 
Since the printing of my last list of the Fauna of 
Cymmeran Bay, the collection of shells obtained from 
there has been more than once revised, and I have seen 
reason to believe that in several instances my determination 
of the species has been faulty, from my having had only 
