PHYSIOLOGY OF THE INVERTEBRATA. 



109 



methods. The isolated ferment, as well as the organ ajid its 

 secretion, digest fibrin. 



Neither the organ nor its secretion contains biliary acids or 

 glycogen, From these investigations there is lio doubt that 

 the so-called liver of Patella vulgata is similar in function to 

 the pancreas of the Vertebrate division of animal life. 



The two salivary glands of Patella are well-marked, and 

 situated anteriorly to the pharjmx, lying beneath the pericar- 

 dium on one side and the renal and anal pajDillEe on the other. 

 They are of a yellowish-brown colour, and give off four ducts. 

 The secretion of these glands was examined by the same 

 method applied to the salivary glands of Sepia offleinalis (see 

 later in this chapter), and wiih similar results. 



The following table represents the constituents found in 

 the salivary secretions of the two orders of the MnHusca : — • 



, + = Present. 



Absent. 



The " liver " and salivary glands of Biuxinwm (whelk) 

 have similar functions as the same organs in Patella. 



The Cephalopoda. 



In a memoir published in the Chemical JVews, vol. 48^ 

 page 37, and the Journal of the Chemical Society, 1884, 

 page 94, the author gave an account of a peculiar excretory 



