156 Transactions. — Zoology. 



(Esophagus (tig. 1 c). — The buccal mass narrows into the oesophagus, 

 which passes through the nerve-collar and peri-cesophageal cartilaginous 

 ring, and is continued to the stomach without ingluvial dilatation. It 

 dilates slightly as it enters the stomach. 



Stomach (fig. 1 m). — The stomach is saccular and thick-walled. It 

 shows two slight constrictions. The walls present on their inner surface 

 strong longitudinal plica3, which are prolonged into the intestine, and con- 

 tinue throughout its length. 



Lying within the stomach is a loose tunic or sac with thick, though 

 almost transparent, walls, showing longitudinal plicae or corrugations. It 

 has a wide orifice at one end, and at the other is thin or open. I have not 

 been able to discover that it has any organic connection with the walls of 

 the stomach, but as I have found it in all the specimens I have examined, I 

 do not think its occurrence can be accidental. 



The pyloric opening is at the lower end of the stomach and close to the 

 cardiac opening. The commencement of the intestine is shown by a well- 

 marked constriction. Neither cardiac nor pyloric opening is protected by 

 a valve. 



Pyloric ccecum (fig. In). — Immediately following the constriction there 

 is given off a long coecal dilatation with thin but tough transparent walls. 

 It expands at its attached end and tapers gradually to its opposite rounded 

 extremity. When in situ it forms a half curve round the stomach. As will 

 be presently noticed, the hepatic ducts open into this ccecum. On the 

 broadest part of its wall, at the attached end is a circular coat formed by a 

 radiating mass, whose nature I have not discovered. 



Intestine (fig. 1 h). — From the pyloric ccecum the intestine narrows 

 gradually until the anus is reached. At somewhat less than half the 

 distance between the ccecum and the anus it is folded over so as to 

 form a distinct flexure. The anus has two stalked and leaf-like lateral 

 valves. 



Ink-sac (fig. 1 h). — The ink-sac is large and broad. Its highest and 

 broadest part lies near the intestinal flexure, and from this part it narrows 

 to its opening into the anus. Its coat is silvery and, in places, iridescent ; 

 and the dark sepia shows through the sac-walls. Throughout its length 

 it is held closely to the intestine by a membrane. 



Liver (fig. 1/). — The liver is large, extending from immediately above 

 the cephalic cartilage for about two-thirds of the length of the oesophagus. 

 It is encased in a capsule showing under the miscroscope close fibres and 

 yellow concretions. The liver itself is loose, and under the microscope shows 

 clustered follicles and interlacing tubes with abundant yellow concretions. 

 The bilobed condition is not observable. 



