Glandina iruncata, of Say. 419 



being more voluminous. It occupies the whole of the anterior 

 half of the surface of the viscera, and descending on the left 

 side beneath them terminates on the right at d. 



The heart and pericardium are enclosed in the respiratory 

 sack, but are less closely attached to the kidney than in the 

 Helices. 



Nervous System. The nervous system (fig. 4,) consists 

 of the supra and infra-cesophageal ganglia united by com- 

 missures and of two other ganglia much more minute, united 

 to the first pair by very delicate filaments ; if other ganglia 

 exist, 1 have not been able to detect them. From the three 

 pairs just mentioned, are given oflf nerves to the different 

 organs of the body. From each of the supra-oesophageal 

 ganglia are given off two nerves, of which the anterior and 

 smaller is sent to the superior or occular tentacle, a, and the 

 posterior much larger than the preceding to the third pair of 

 tentacles c, but which in its course gives off a small filament 

 to the second pair h. Other filaments more minute are given 

 off from the superior ganglia to the parts about the mouth. 

 The infra-oesophageal ganglion appears to be composed of 

 several smaller ones united together so as to form a ring, in 

 the centre of which is an open space through wliich passes a 

 large arterial trunk to be distributed to the parts about the 

 head and mouth.* The superior and inferior ganglia are 

 united by long and slender commissures, e, each of which 

 is composed of three filaments distinct from each other. The 

 ring thus formed by the union of these two sets of ganglia 

 embracing the buccal organ, is remarkably distinguished by 

 its size, from the same part in Helix, Limai, Tebennophorusy 

 Bulimus, and Vagijiulus, where it simply embraces the oeso- 

 phagus. The nerves derived from the lower ganglion are 

 principally locomotive and are distributed to the foot and 

 integuments. The third pair of ganglia (fig. 4, s^,) are 

 situated on the upper face of the buccal pouch, near the 

 commencement of the oesophagus and are united to the supra- 



* A similar conformation exists in the genera Limax, Helix, and Tebcnnophonis, 

 but I have not seen it described in any treatise on the subject. 



