Dalhousie Springs hydrobiids S 
nis of D. globosa, Spring Cal (station C641B). B, D. Penes of 
Figure 13. Head and penes of Dalhousia species. A. pe ] о 
D. harrisi, B, Spring Са? (station C644); D, Spring Cal (station C641A). C. Head and penis of D. harrisi, 
Spring Cal (station C641A). ct — cephalic tentacle; sn — snout. Scales A,B,D - 0.2mm, С- 0.5mm. 
large triangular median cusp and 4-6 (usually 5 or 6) on outer side. Inner marginal teeth with 25-27 
Narrow, sharp cusps on antero-distal and outer-distal edge. Outer marginal teeth with 27-33 small, 
narrow, sharp cusps (approx. half length of those on inner marginal teeth) on antero-distal and 
ner-distal edge. (Description based on 4 radulae). 
Head-foot, Animal unpigmented except for pigment patches on head behind eyes and mid-dorsally; 
Орегсшаг lobe usually unpigmented, rarely with trace of pigment. Ciliation on snout (Fig. 9E,F) well 
developed laterally, a narrow, but well-developed band laterally and latero-dorsally just behind labia, 
and scattered cilia dorsally. Cephalic tentacles with well-developed dorsal band of cilia (Fig. 8D) 
Which extends most of length of tentacle, and a pair of weaker ventro-lateral bands. 
Anatomy. Osphradium unpigmented, located just behind middle of ctenidium. Ctenidium with 14- 
16 broadly triangular filaments, apices near right side (0.06-0.15 mm from left side, maximum 
Width 0.12-0.17 mm; abuting (or one filament overlapping) pericardium. Rectum with small to 
Moderate U-shaped bend. Renal organ extending 1/3 to 1/2 of length into pallial roof; renal gland 
0.31-0.39 mm in length, 0.17-0.20 mm in width. Pericardium extending about 1/2. of length into 
pallial roof. Stomach (Fig. 20D) with style sac 0.32-0.43 mm in length, stomach proper 0.39-0.46 
mm in length. Gastric caecum small to minute (0.01—0.20 mm in length). 
Testis of 1.0-1.2 whorls; seminal vesicle beneath half whorl of testis behind stomach, moderately 
to markedly convolute over stomach. Prostate gland 0.31-0.32 mm in length (about half in pallial 
