

224 
Obs.—The fry reveal a spiral nucleus of two full turns, 
dextral, smooth, and horn-coloured. In some, especially the 
smaller. the ribs are more distinct and the sculpture less rug- 
ged. Some have much more brown colouring; either in the 
intercostal spaces or in the internal horseshoe or both. One 
has the enlarged extremities of the horseshoe muscle-scar 
plainly painted. We have no other Siphonaria with its apex 
so near the posterior end. The largest example is 94 mm. 
by 65. I have named the species after Miss Stow, who col- 
lected the immature examples. 
EXPLANATION OF PLATES. 
Prats VIII. 
Fig. iy Scutellina alboradiata, Vereo.—Ventral view. 
» . ” a) Side view. 
5, 3. Siphonaria stowa, Verco. — Dorsal view. 
pe oth 3 + hy Ventral view. 
3. Gb Hp z) By Side view. 
Ese 6 iS: e % Radula. : 
” 7. ” ” ” Radula, rachitiidn, and 
first lateral from the 
other half. 
ry dee 5 “55 ‘; Vifth lateral, side view. 
5 9» Scutellina calva, Verco.—Ventral view ! r 
gy MU, ‘- ee - Side view ! 
5, ll. Nacella compressa, Verco.—Side view. 
7 12; <3) ; »,  Wentral view. 
: Prare IX, 
Fig. 1. Lippistes meridionalis, Verco. 
ge 2} is ap », Protoconch. 
» 3. Seguenzia polita, Verco. | 
Ay ke ie i ‘ Lip in profile 
resarys “3 _ Basal view. 
» 6. Lippistes separatista, Dillwyn.—Spire, full view. 
ay) 3 4 of With epidermis. 
tee ch x in Operculum. 
” 9. ” ” ” Radula. 
Prats X. 
Fig. 1. Basilissa radialis, Tate, var. bilix, Hedley. 
” y, ' ” ” ” ” Base. 7 
hab on aN x) *) ,, Outer lip. 
5. 4. Nacella.stowe, Vereo. — Ventral view. 
ie 4 ee PF Side view. | 
, 6. Helcioniscus illibrata, Verco.—-Side view. 
ny US a a 5 Ventral view. | 
ay teh Mis mi ry Radula, front view. - 
oy! D 5 + Laterals, side view. 
rp, WO - 3) -$) Marginal, side view. 
vs HEA an on 35 A second radula, front 
view. 
gy 1B}, in 4 m Laterals, side view. 
py eed: a 3 Rs A third radula, front 
view. 
pte ~ # rs A lateral, side view. 
