New Land Shells from Costa Rica. 261 
are bifid by having the side spur often found on the side mar- 
ginals in this genus. The 13th, 14th, and 15th teeth form the — 
transition into the marginals. 
Glandina (a large species not yet identified). 
The lingual membrane is as usual in the genus. There are 
33-1-33 teeth. 
Helix (a small unidentified species). 
Jaw not observed. 
Lingual membrane (plate xi, fig. G), long and narrow. Teeth 
(15-1-15. Centrals with a base of attachment longer than wide, 
with lower lateral expansions; reflection large, decidedly tricuspid, 
each cusp surmounted by a cutting point. Laterals like the centrals, but 
asymmetrical and consequently bicuspid. Marginals low, wide, irregu- 
| larly denticulated or serrate, the inner three cutting points being longer 
_than the outer ones, of which there are several. 
_ Locality, Upper Tirili River. 
Tebennophorus. 
_ There are several drawings of slugs of this genus, apparently 
all referable to one species. It may be that described by 
~Morch (Mal. Blatt., VI, 109) as Costaricensis. 
Several of these figures are given in plate xi, fig. M. 
_ The jaw of this is strongly arched, of equal width to its 
blunt extremities. There are subobsolete anterior ribs about 
the centre of the jaw, the ends of five of which denticulate 
the cutting margin. 
The lingual dentition is figured on plate xi, fig. N. There 
are about 28-1-28 teeth. The centrals have a long base of 
attachment, with a strong line of reinforeement running par- 
allel to its margin at the lower edge and for a short distance 
vat the sides. The reflection is heel and bears a short, stout 
“median cusp, and small stout side cusps, all three cusps bear- 
ing short, stout cutting points. The lateral teeth are like the 
-centrals, but serene by the suppression of the inner 
cusp and cutting point and the inner lower expansion of the 
base of attachment. The marginals are but a modification of 
the laterals, the inner cutting point not becoming bifid, though 
