DR. EMBLETOX OX THE VEND1CE. 



153 



simple and short, and closely resembles that of the Trout, and 

 that also of the Herring ; it is a plain tube bent twice upon itself 

 at the upper part, and then, running straight backwards, curves 

 near the end slightly downwards to the anus. Its dimensions in 

 the fresh specimens are, from the commencement of the oesopha- 

 gus to the bottom of the first turn one inch and one-sixteenth, 

 thence to the top of the second turn seven-eighths of an inch, 

 and from that part to the anus rather more than three inches, 

 about five inches in total length. The bent upper part of the 

 tube is somewhat wider than the rest. The liver is small and 

 of a pale yellow, its duct opens into the duodenum. Panereatic 

 coeca, spleen, and swim-bladder are absent. The reproductive 

 organs -are in a state of complete inactivity, and so minute that 

 the sex was not distinguishable : the specimens were killed in 

 August. 



The appended figure, drawn by Mr. John Hancock, represents 

 exactly the alimentary canal. 



Alimentary Canal. Vendace. Natural size. 



Liver in dotted outline. 



Nov. 30, 1871.— By John Hancock. 



Length of Fish, 7-rV inch. 



Do. of Canal, o^- 6 - inch. 



The external characters of the Vendace, the Gwiniad of Wales, 

 and the Pollan of Ireland, arc so much alike that no specific dif- 

 ference can be drawn between them, they differ only in size. It 

 is for this reason that it is considered most probable that they 

 arc mere varieties of the same Coregonus, whilst the Powan of 

 Perthshire, the Skelly of Ullswater, and the Swedish fish men- 

 tioned by Nilsson are probably also only varieties of the same. 



The Vendace, in its external characters, with the exception 

 of the adipose fin, which is regarded as belonging specially to the 

 Salviom'dce, and, in its habits, approaches nearer to the Clupeida 



