Dalhousie Springs hydrobiids 2 
Fi 
Іше 7. Opercula of Dalhousia species and Fluvidona centralia; all from inner side. А,В. D. globosa, Spring Cal 
(station 641c). C-E. D. harrisi. C, topotype (station Cal We), D, Spring Cal3A, E, Spring Ca7 (station C644). 
F-H. E centralia. F,G, paratypes, Н, Spring El, lower outflow (station D62). Scales 0.2mm. 
