AGARDHIA. 157 



ened ; columellar lamella deeply placed, vertical, bilobed, the 

 lower lobe projecting more. Tooth of the outer lip more 

 massive than in A. lamellata. No basal fold. Length 4, diam. 

 1.35 mm. ; fully 7 whorls. 



8a. A. macrodonta gracillima n. subsp. PI. 18, figs. 6, 7. 



Diameter less than one-third the length. Rib-striae closer, 

 about 22 in 1 mm. on face of the last whorl. Small folds in 

 both upper angles of the aperture. Columellar lamella a 

 simple lobe, steeply ascending spirally. In the massive outer 

 tooth and absence of a basal fold it is like typical macrodonta. 

 Length 3.8, diam. 1.1 mm. ; slightly over 7 whorls. 



While this form occurred in river drift with macrodonta, 

 it is quite likely that they were washed down from different 

 stations. 



9. Agardhia rumelica Hesse. PL 18, figs. 8 to 12. 



Differs from the type [of macrodonta] by the decidedly 

 weaker dentition as well as the closer, finer and still less ob- 

 lique riblets. In the middle of the parietal wall a strong, 

 straight lamella; the tooth of the outer margin much weaker 

 than in the type, the outer wall less impressed. Columella 

 sometimes quite smooth, sometimes with one or two low folds, 

 the lower one generally on the base of the columella. Seven 

 to eight whorls. Size very variable; of 13 examples before 

 me, the largest measures, 4.9 : 1.5 mm., the smallest 3.7 : 1.4 

 mm. (Hesse). 



Rumelia : debris of the Maritza at Philippopolis. 



Agardhia armata Cless., Hesse, Nachrbl. D. Malak. Ges., 

 vol. 45. 1913, p. 9. — Agardhia macrodonta rumelica Hesse, 

 Nachrbl., vol. 48, 1916, p. 117. 



This is the form which I erroneously called Ag. armata in 

 my former work. In Ag. parreyssi the parietal lamella is 

 very low and weakly developed, the rib sculpture of the shell 

 is almost vertical; outer lip and columella are very weakly 

 toothed (Hesse). 



Plate 18, fig. 8, the largest example of thirteen, 4.8 mm. 

 long, 1.4 wide, with 8 whorls, may be considered type of this 

 form, which at present does not appear to intergrade with 



