46 PROCEEDINGS OF THE ACADEMY OF 



nient as that of Amphibulima appendiculafa, Pfr. (see fig. 5), but 

 dirt'evs among other things in wanting the huge testicle of that 

 species. 



The digestive sj^stem presents no peculiar characters. The 

 stomacli is long, narrow, and ribbon-shaped, lying under the 

 genital system and extending backward as far as the shell when 

 the animal is extended. At this point the stomach forms the 

 usual cul-de-sac at its junction with the intestine. The last organ, 

 and the liver are small in proportion, as would be anticipated 

 from the short spire of the shell ; the liver is dark blue. There 

 seems to be a retractor muscle to the whole head rather than to 

 the buccal mass. It lies on the floor of the cavit}'. The buccal 

 mass is large, the oesophagus small. The salivary glands and 

 ducts, and pouch of the lingual membrane are as usual. The jaw 

 is readil}' detached from the muscles of the mouth, and is not 

 connected with the lingual membrane as usual with our Helices.* 

 It is thin, wide, low, arched, with attenuated, bluntly pointed 

 ends ; divided by numerous (about 63) delicate ribs into separate 

 plate-like divisions, as in the jaw of Gi/lindrella, Bidimidus, etc., 

 the ribs running somewhat obliquely towards the centre of the 

 jaw ; there is no decided, upper median, triangular plate (fig. 2, 

 plate VIII.). The lingual membrane (plate VII., fig. 3) is long, 

 broad, composed of numerous rows of 76-1-76 teeth. Centrals 

 long, narrow, expanding below with the lower margin squarely 

 excavated as in Succinea ; tricuspid, the central cusp yQvy long, 

 wide, with a greatly expanded, squarely truncated cutting point 

 reaching beyond the lower margin of the tooth; the side cusps 

 short and narrow, simply pointed. The lateral teeth are of same 

 t3'pe as the centrals, but unsymmetrical and bicuspid. The mar- 

 ginals are a simple modification of the laterals, with a long, 

 bluntly truncated median cusp, and obsolete side cusps. The 

 extreme marginals are irregularly denticulated, the outer and inner 

 denticles being more produced, especially the outer, and greatlj'' 

 curved ; the inner denticles, usually two in number, are quite 

 small. 



The jaw agrees perfectly with that of the genus Amphibulima 

 described by us. (Ann. Lye. N. H. of N. Y., x. p. .223, pi. xi. 



' Even after boiling the whole buccal mass in potash, the lingual mem- 

 brane and jaw remain attached in most of our Helices of K. A. showing a 

 decided connection between the two. 



