B00 
L.M.B.C. MEMOIRS. 
No. XVII.—PECTEN. 
The Edible Scallop. 
BY 
Wad. DAKIN, M.Sc., 
1851 Huhibition Scholar, University of Liverpool. 
INTRODUCTION. 
Although the greater part of the following account of 
this type apphes to the anatomy and histology of Pecten 
maximus, the very common smaller species P. operculares 
has also been investigated. Some details in which the 
latter differs from P. maximus are mentioned in the text, 
but, on the whole, these differences are but slight, and 
either species may be dissected and examined while using 
this Memoir. 
The work has been carried out chiefly in the Zoology 
Department of the University of Liverpool and at the 
Port Erin Biological Station, Isle of Man. The chemical 
work was done at Larne. Co. Antrim, and some of the 
observations on the sense organs at Kiel. My thanks are 
due to Professor Herdman for his valuable advice, and 
for aid in obtaining living material by dredging at Port 
Kirin; also to the Larne Aluminium Company for per- 
mission to use their chemical laboratory; and finally to 
Mr. Chadwick, Curator of the Port Erin Biological 
Station. 
TAXONOMY AND DISTRIBUTION. 
Pecten maaimus and P. opercularts are two.of the 
common British species of the genus Pecten, and. are 
known in some places as “ scallops.’ Pecten is the most 
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