208 BULLETIN OF THE NATURAL HISTORY SOCIETY. 



middle of a dorsal valve ; — h Enlargement of the surface 

 of the lateral slope of the valve. The two mag. y, 

 See p. 202. 

 Fig. 2. Acrotreta proavia, n. sp. a Ventral valve, upper side ; 

 — b same, lower side; — c same, side view; — d Dorsal valve ; 

 — e Mould of a dorsal valve ; — / Side view of a dorsal valve, 

 All mag. V'- See p. 203. 

 Fig. 3. Bradoria rugulosa, n. gen. et. sp. a Side view of right valve ; 

 — b Outline from the front ; — c Outline from the cardinal 

 side ; all mag. -| ; — d Outer surface of the valve ; mag. y. 

 See p. 205. 



Plate IV. 



Fig. 1. Bradoria scrutator, n. sp. a Side view of the left valve ; 



— b Vertical section ; — c Transverse section. All mag. ^. 



See p. 204. 

 Fig. 2. Bradoria vigilans, n. sp. a Side view of the right valve ; 



— b Outline, front view ; — c Outline, cardinal view. All 



mag. £ See p. 205. 

 Fig. 3. Schmidtella pervetus, n. sp. a Side view of (the right 1 ) 



valve ; — b vertical section ; — c transverse section. All 



mag. f . See p. 206. 

 Fig. 4. Schmidtella acuta, n. sp. a Side view of (right 1 ) valve ; 



— b Vertical section ; — c Transverse section. All mag. |. 



See p. 206. 



ERRATA TO THE PRECEDING ARTICLE. 



For " Stiletto, read stilletto. 



For "lip," read projecting lip. 



For " trilobites," read Trilobites. 



For "Capulidjv," read Patellida-. 



For " Lamellibanchs," read Lamellibranchs, 



