REPORT ON THE CIRPJPEDIA. 37 



where in reality a pancreatic or a chyle-producing gland should be 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 arc 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. 



