EEPOET ON THE CIEEIPEEIA. 
37 
where in reality a pancreatic or a chyle-producing gland should he spoken of, has proved 
to be very important. Weber, however, tries to demonstrate that in the Crustaceans 
which he studied the digestive glands are built up of two kinds of glandular cells, and 
therefore are at the same time liver and pancreas, both modified so as to be accommodated 
to the organisation of the Crustacean body. Now no doubt is left that the glands of the 
Cirripedia are built up of one kind of cells only, and I think we can safely admit that 
these belong rather to the pancreatic than to the hepatic type. Whether the excrescences 
of the wall of the stomach (which are very strongly developed in Lepas and which are 
coated in the interior by a cylindrical epithelium with very small cells , 1 the nuclei 
of which are almost entirely hidden by a dark-brownish pigment) represent a kind 
of liver, I cannot undertake to say. It is indeed a curious fact — one, however, observed 
by Darwin thirty years ago — that these excrescences are large and well developed in 
some genera {Lepas, Conchoderma), and almost totally wanting in others (Scalpellum). 
1 The height of these cells is 0 - 03 mm., their breadth only 0 - 006 mm. 
