•352 NOTES. 



mother and return tn her again, up to twenty -eight days, when they 

 become independent. 



In a note appended to M. Chantran'.s i)aper, M. Kobin states, that "the 

 j'oung are suspended to the abdomen of the mother by tlie intermediation 

 of a chitinous hyaline filament, which extends ft-om a point of the 

 internal surface of the shell of the egg as far as the four most in- 

 ternal filaments of each of the lobes of the median membranous plate 

 of the caudal ajipi'ndage. The filaments exist when the embryos have 

 not yet attained three-fourths of their development."' Is this a larval 

 coat i Kathke does not mention it and I have seen nothing of it in 

 those recently hatched young which I have had the opportunity of 

 examining. 



Note VII,, Chaptek II., p, 04. 



THE "SALIVAKY" GLANDS AND THE SO-CALLED "LIVEIi" OF 



THE CKAYFISH. 



Braun (Arbeiten aus dem Zoolngisch-Zootomischen Institut in 

 Wiirzburg, Bd. II. and III.) has describeil " salivary " glands in the 

 walls of the oesophagus, in the metastoma, and in the first pair of maxillaj 

 of the crayfish. 



Hoppe-Seyler (Pfliigers Arehiv, Bd. XIV. 1877) finds that the yellow 

 fluid ordinarily found in the stomachs of crayfishes always contains pep- 

 tone. It dissolves fibrin readily, without swelling it up, at ordinary tem- 

 peratures ; more quickly at 40° Centigrade. The action is delayed by even 

 a trace of hydrochloric acid, and is stopped by the addition of a few di'ops 

 of water coutainmg 0.2 per cent, of that acid. By adding alcohol to the 

 yellow fluid, a precipitate is obtained, which is soluble in water and in 

 glycerine. The aqueous solution of the precipitate has a strong digestive 

 action on fibrin, which is arrested by acidulation with hydrochloric acid. 

 These reactions show that the fluid is very similar to, if not identical 

 with, the pancreatic fluid of vert£;brates. 



The secretion of the " liver " taken directly from that gland, has a 

 more strongly acid reaction than the fluid ui the stomach, but has 

 similar digestive properties. So has an aqueous extract of the gland, 

 and a watery solution of the alcoholic precipitate. The aqueous extract 

 also possesses a strong diastatic action on starch, and breaks up olive oil. 

 There is no more glycogen in the '■ liver " than is to be found in other 

 organs, and no constituents of true bile are to be met with. 



