PHYSIOLOGY OF THE IXV ERIKBRATA. 



109 



luetliotls. The isolated ferment, as well as the organ and its 

 secretion, digest fibrin. 



Neither the organ nor its secretion contains biliary acids or 

 glycogen. From these investigations there is no 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 Fatclhi are well-marked, and 

 situated anteriorly to the pharynx, lying beneath the pericar- 

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

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

 The secretion of these glands was examined by the same 

 method applied to the salivary glands of t^i'phi offtrhmlU (see 

 later in this chapter), and with similar results. 



The following table represents the constituents found in 

 the salivary secretions of the two orders of the Mollvsra : — 



= Present. — 



Absent. 



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

 have similar functions as the same organs in Patdla. 



The Cephalopoda. 



in a memoir published in the Chemical Xcics, vol. 48, 

 page 37, and the Jouriud of the Chonical Socirfi/, 1884, 

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



