1921] 



NATURAL SCIENCES OF PHILADELPHIA. 



309 



Vaganella undulata (Gabb) Text-flg. 2. 



Balantiuiii undulatum Gabb, Trans. Amer. Philos. 8oc, xv, 1873, p. 200. 



The curved shell, with three low 

 waves on the concave side, is char- 

 acteristic. Length 6.5, greatest di- 

 ameter 1.8 mm. 



Type no. 2892 A. N. S. P. One 

 specimen. 



Styliola sulcifera Gabb. Text-flg. 3. 



<S. sulcifera Gabb, Tr. Amer. Philo.s. 

 Soc. XV, 1873, p. 200. 



This is a rather rapidly tapering 

 species, with the sulcus slightly 

 spiral. The section is not quite cir- 

 cular. The larger end is broken as 

 shown in the figure. 



Length 3.9, diameter at larger end 

 0.9, at smaller 0.3 mm. 



Type is no. 2893 A. N. S. P. 



I: 



I 



Fig. 3. Styliola sulcifera Gabb, 

 lateral view and outline of oral end. 



Diacria bisulbata Gabb. Text-fig. 4. 



Diacria bisulcala Gabb, Trans.' Amer. Philos. Soc. xv, 1873, p. 200. 



The broader, smooth, mesial convexity will distinguish this species 



Fig. 4. Diacria bisulcala, Gabb, type. 



from the recent D. trispinosa. The type, no. 2894 A. N. S. P., 

 measures, length 4.3, width 4.2, thickness 1.4 mm. 



