Dalhousie Springs hydrobiids d 
Figure 8, Cephalic tentacles of Dalhousia species and Fluvidona centralia. A,B. D. harrisi, Spring Ca7 (station SC 
A, ventral (proximal) and laterodorsal (distal) views; B, dorsal view (also showing part of ae i А Ss ИНА, 
D 8lobosa, dorsal view (also showing part of snout and foot), Spring Cal (station 641B). D, F. cen , 
dorsal view, Spring El, paratype. dc —.dorsal cilia; vc — ventral cilia. Scales 0.1mm. 
0.42-0.43 mm in length (about 0.09-0.15 mm in pallial roof), 0.19-0.34 mm in height, broadly 
Dall, moderately to narrowly oval in section. Pallial vas deferens undulating, unpigmented to dens 
Srey (darker than surrounding epithelium of neck) low, rope-like ridge across neck at base of penis; a 
ion undulations nearer prostate, straight immediately anterior to, and beneath, prostate. Penis S E 
~D) unpigmented or with proximal part of distal section of penis with grey pigmentation, basa 
eon unpigmented or with some grey pigment; distal section long and evenly tapering, basal 
ae relatively small, expanded. Penis base 0.35-0.38 mm from right eye, just to right of midline 
ead. 
Оуагу of 1.0-1.3 whorls. Coiled oviduct (Fig. 14B,D, co) with 1 distal U-shaped loop, ee 
anteriorly to vertically; distal part arched dorsally to top of sperm sac, posteriorly, wrapped aroun 
sperm sac in S-shape coil. Duct to sperm sac anterior, very short. Common duct (Fig. 14B, cd) long, 
aight, Sperm sac (Fig. 14B,D, sps) globular, 0.28-0.35 mm in maximum length, 0.25-0.31 mm in 
maximum width. Albumen gland (Fig. 14B, ag) 0.55-0.66 mm in length, 1/7-1/4 of length in pallial 
roof; slightly shorter than capsule gland. Capsule gland (Fig. 14B, ag) rounded bluntly tapered 
anteriorly, circular to oval in section, about 0.7 mm in length, with distinct glandular zones. Ventral 
channe (Fig. 14B, vc) narrow, lacking distinct vestibule, small, short opening (Fig. 14B, po) at or 
Ightly behind anterior end of capsule gland. 
Distribution (Fig. 15). Found living around the water edge of the main pool of Cal. Springs 
