156 AGARDHIA. 



8. Agardhia macrodonta Hesse. PL 18, figs. 4, 5. 



Differs from A. lamellata Cless. by the shell smaller and 

 more slender throughout, with rather more widely spaced, 

 less raised riblets which also appear to be less oblique. The 

 aperture is a little less contracted by the lamellae and folds, 

 though these lamellae and folds are individually variable as in 

 all forms of this group. The always strong and high parietal 

 lamella is straight (not bent S-shaped, as in A. lamellata). 

 A tooth in the middle of the outer margin is strongly devel- 

 oped also in this species, but the outside is less impressed at 

 the position of the tooth. On the columella there is a strong 

 tooth opposite, below it another fold-like, more or less obso- 

 lete one. Likewise there are traces of weak folds in both 

 angles of the aperture. The peristome is sometimes shortly 

 free. The outer margin is straight and thin in its upper half, 

 thickened and expanded outward in the lower half from the 

 tooth down. Two well-preserved specimens are before me. 

 Height 3.8 and 4.2 mm., diam. 1.2 and 1.5 mm. (Hesse). 



Eastern Ruinelia : debris of the Maritza at Philippopolis. 



Agardhia lamellata Cless., Hesse, Nachrbl., vol. 45, 1913, p. 

 9. — Agardhia macrodonta Hesse, Nachrbl. D. M. Ges., vol. 

 48, 1916, p. 116. 



This is the form which I formerly took to be Ag. lamellata 

 Cless. Subsequently I received from Herrn Oberstabsarzt Dr. 

 Wagner the Transylvanian A. lamellata from the original 

 locality, Kerczsora im Fogaraser Gebirge, and satisfied myself 

 that my Rumelian form is sufficiently distinct from it to pass 

 as a separate species (Hesse). 



The two specimens at present known, which have been lent 

 me for illustration, represent two rather diverse forms, which 

 require separate notice, though it may possibly turn out that 

 they are connected by intermediate forms. Hesse's descrip- 

 tion translated above covers both. 



Typical A. macrodonta Hesse. PL 18, figs. 4, 5. 



Diameter one-third the length. About 15 riblets in one mm. 

 on the face of the last whorl, less oblique than in A. lamellata. 

 Parietal lamella straight; without, distinct accessory lamellae 

 on the parietal wall. Columellar margin irregularly thick- 



