404 PROCEEDINGS OF THE NATIONAL MUSEUM. 



Pterodina calcaris Langer, Verh. Ver. Nat.- u. Heilkde., PresBburg, n. ser., vol. 



19, 1909, p. 46, fig. 3. 

 Testudinella hidentata Harking, Bull. 81 U. S. Nat. Mue., 1913, p. 100. 

 Testudinella parva Harring, Bull. 81 U. S. Nat. Mus., 1913, p. 100. 



In recent collections from Kenilworth this species has occurred in 

 considerable numbers, and in all stages from the form w-ith well- 

 developed posterior teeth on the edge of the lorica to the toothless 

 form, including specimens with the tooth present on one side and 

 absent on the other. As one name must be dropped, and parva has 

 page priority, apart from its being rather more suitable, it seems best 

 to retain this as the specific name. 



EXPLANATION OF PLATES. 



All the figures are highly magnified; for actual measurements see 

 text. 



Plate 34. 



Fig. 1. Encentrum viyriophylli, lateral view; page 395. 



2. Encentrum viyriophylli, trophi, ventral view. 



3. Encentrum myriophylli, trophi, right lateral view. 



4. Encentrum riccis, lateral view; page 396. 



5. Encentrum riccise, trophi, ventral view. 



6. Encentrum riccise, trophi, right lateral view. 



7. Encentrum aper, lateral view; page 394. 



8. Encentrum aper, dorsal view of head. 



9. Encentrum aper, trophi, ventral view. 



10. Encentrum aper, trophi, right lateral view. 



11. Diglena claslopi^, lateral view; page 397. 



12. Diglena clastopis, trophi, ventral view. 



13. Diglena clastopis, trophi, right lateral view. 



Plate 35. 



Fig. 1. Monostyla sylvatica, ventral view; page 399. 



2. Monostyla sylvatica, dorsal view. 



3. Monostyla sylvatica, lateral view. 



4. Lecane stichsca, ventral view; page 397. 



5. Lecane stichsea, lateral view. 



6. Lecane stichsea, dorsal view. 



Plate 36. 



Fig. 1. .¥onos<2/fa GCJ/s, ventral view; page 398. 



2. Monostyla acus, lateral view. 



3. Monostyla acus, dorsal view. 



4. Monostyla crcnata, ventral view; page 399. 



5. Monostyla crcnata, lateral view. 



6. Monostyla crenata, dorsal view. 



