Glandina tnincata, of Say. 421 



it and that of the genera Bulimus, and Achatina, to which 

 it is more intimately alHed, and with which it has been con- 

 founded. The means of making the comparison are derived 

 from the dissection of Achatina perdix, from western Africa, 

 and of Bulimus ovatus. In both Bulimus and Achatina the 

 buccal pouch has the same ovoidal form which is found in 

 nearly all the genera of Pulmonifera ; in Glandina it is so 

 much elongated that its longitudinal exceeds many times its 

 transverse diameter. There exists no horny beak, at the 

 entrance of the mouth of Glandina ; in Bulimus and Achati- 

 na, it is large and denticulated on its concave or cutting edge. 

 The teeth on the tongue of the two last genera, are arranged 

 in transverse lines, extending from side to side without undu- 

 lations, and of a uniform size, and obtusely conical shape, 

 with a symmetrical range on the median line ; in Glandina 

 they are acute, recurved, smallest towards the centre and 

 edges, arranged " en chevron," but wanting on the median 

 line. The three genera are provided with a muscular stomach 

 or gizzard, but Glandina alone has the membranous portion 

 terminating anteriorly in a cul-de-sac. In Glandina the 

 salivary glands form a distinct collar or ring, around the oeso- 

 phagus ; in the other two genera they are separate, as in the 

 Helices. In Bulimus and Achatina, the anterior lobe of the 

 liver is the largest; in Glandina it is smallest. There appears 

 to be but one bile-duct in the last, and there exists two large 

 ones in the former. The third pair of tentacles, which are so 

 prominent in Glandina, are represented by two buccal fringed 

 lobes in Bulimus : neither tentacle nor lobe exist in Achatina ; 

 in Bulimus, as in Glandina, these are provided with a special 

 nerve. In Achatina the male organ is loosely enveloped in 

 a large and muscular sheath, which does not exist in either of 

 the other genera. 



These are the most prominent differences between Glandi- 

 na and the other genera, others of less importance also exist ; 

 but those which have been enumerated seem to be sufficient 

 to demonstrate that the genus Glandina cannot be con- 

 founded with either of the others. 



