68 W.F. Ponder, D.J. Colgan, T. Terzis, S.A. Clark, A.C. Miller 
Statistics of 20 opercula from the type series. 
Female, N=5 
OL OS PL PH PN 
Minimum 0.67 0.11 0.08 0.04 2 
Maximum 0.82 0.24 0.16 0.11 4 
Mean 0.76 0.18 0.11 0.07 3 
S.D. 0.06 0.05 0.03 0.03 0.71 
Male, N=15 
OL OS PL PH PN 
Minimum 0.62 0.11 0.04 0.03 1 
Maximum 0.82 0.25 0.19 0.18 4 
Mean 0.71 0.17 0.10 0.09 2.93 
S.D. 0.06 0.04 0.04 0.05 0.96 
Radula (Fig. 19). Central teeth broad, each with 4-6 (usually 5) small, triangular cusps on either side 
of a sharp median cusp about twice the length of the adjacent cusps. 3-4 pairs of lateral basal 
denticles present, innermost larger. Lateral teeth with largest cusps in tooth row, 4—5 on inner side of 
Figure 12. Male genitalia of paratypes of Dalhousia species and Fluvidona centralia. A. Prostate gland of Dalhousia 
globosa viewed from left side. B. Prostate gland of Dalhousia harrisi viewed from left side. C. Penis of 
Dalhousia globosa. D. Penis of Fluvidona centralia. pd — penial duct, ppc — posterior end of pallial cavity. 
pyd - pallial vas deferens, vvd — visceral vas deferens. Scales A,B — 0.25mm, C — 0.5mm, D – 0.1mm. 
