HYALINA. 



51 



ends ; anterior surface with a few central Fig. 81. 



strias ; concave niargin smooth, with a slight 

 median projection. 



Lingual membrane with 68 rows of 

 l^ — 1 — 15 teeth each ; centrals with one 

 very long and t\vo small cusps ; laterals of 

 same shape, but bicuspid ; uncini acute, recurved, thorn-shaped, 

 greatly modified in size as they pass off laterally. 



Fi2. 82. 



Jaw of 

 Ilyolina m ultidentata. 



[MOKSE.] 



Fig. 83. 



Hyalina significans, Bland. — Shell uinhilicate, depressed, dis- 

 coidal, thin, with fine irregular striae, which are almost obsolete at the 

 base, shining, pale horn-colored ; spire little elevated ; 

 suture slightly impressed ; whirls six, subplanulate, the 

 last roundly inflated, rather flat at the base, excavated 

 around the umbilicus, which is pervious, and equal almost 

 to one-fifth of the diameter of the shell ; aperture oblique, 

 depressed, lunate ; peristome simple, acute. Greater diam. 

 4j, lesser 4 ; height 2 mill. 



Helix signijiciins, Bland, Am. Jonrn. Conch. II, No. 4, 

 p. 372, pi. xxi, f. 9 (18(56). 



Gastrodonta siffnificans, Tryon, Am. Journ. Cocch. II, 

 163, pi. xi, f. 39-41 (1866), 



Fort Gibson, Indian Territory. 



In a young specimen of //. significans, having four whirls 

 only, there are three small teeth, one by itself, and at some dis- 

 tance from it, two others, situated as the teeth are in H. multi- 

 dentata. Whether these teeth are or not constant in the 

 antepenultimate whirl of H. significans, I am unable to de- 

 termine. (Bland.) 



