SPECIAL ANATOMY. 213 



BuLiMUS. The digestive apparatus in B. dealbaius, 

 B. decoUatus, and B. virgidatus, resembles that of H. 

 aurieulata; the oesophagus is long, narrow, and dilated 

 in the middle ; the stomach is cylindroid, and more or 

 less sacculated. The stomach of B.fasciatus resembles 

 that of Limax variegata, being large find capacious ante- 

 riorly, cylindrical and sacculated posteriorly. The rec- 

 tum is capacious and sacculated. 



Pupa. A characteristic of this genus is the very great 

 proportionate length of the viscera, corresponding to the 

 numerous whorls of the shell. The retractor muscle of 

 the buccal mass is long and strong. The dental plate 

 has two central, conical toothlets in its cutting edge. 

 The oesophagus is very long and narrow. The stomach 

 is very long, and even forms a fold upon itself. The rec- 

 tum is very long and sacculated ; the muscle on its outer 

 side is well developed. 



SucciNEA. A characteristic of this genus, the re- 

 verse of Pupa, is the great breadth and shortness of the 

 viscera. The dental plate has an upper, quadrangular 

 piece, superadded to the ordinary, crescentic plate. 

 The stomach resembles that of Limax variegata. Its 

 mucous membrane presents several longitudinal rugae. 

 The small intestine does not undergo the same relative 

 diminution with the other viscera. The rectum is very 

 short, and, from the transverse position of the pulmo- 

 nary cavity, it is placed along the right of the breadth, 



