VELLETIA. 
221 
In Velletia no part of the cross row of teeth is 
straight ; its central part is much arched, and is com- 
posed of the central tooth and twelve lateral teeth 
on each side, which do not alter much in form ; then 
comes one tooth of a different form, and lastly six 
more on each side, which latter are in a slight curve. 
99. 1. Velletia lacustris. Oblong Lake Limpet. 
— Shell oblong, compressed, with the point 
slightly recurved in an oblique direction and 
nearly central, (t. 10. f. 126.) 
Ancylus lacustris. Muller^ Verm, ii. 199. ; Drap. p. 47. t. 2. 
f. 25 — 27.; Sowerhy,, Gen. f. 2.; Turton., Man. ed. l.*141. 
f. 126. — Patella lacustris. Montagu., T. B. p. 484. ; Don. 
B. S. t. 150. (not Linn.) — Patella oblonga. LigJitfoot., 
Phil. Trans. Ixxvi. (1786), 168. t. 2. f. 1. 5.; Turt. Diet. 
p. 138. — Crepidula oblonga. Fleming., -Etzcz/. ~ Ancylus 
oblongus. Forbes and Hanley., B. M. iv. 188. t. 122. f. 5. ; 
Clarh^ Ann. and Mag. N. H. xv. 278. — Patella cornea. 
Poiret., Prod. — Velletia lacustris. Gray., Man. 251. t. 10. 
f. 126. — Acroloxus lacustris. Bech., Ind. 124. — Ancylus 
Moquinianus. Bourg. Jour. Conch. 1853, 197. t. 6. f. 9. 
In still waters, attached to aquatic plants. 
Animal blackish. 
Shell a quarter of an inch long, and hardly a 
tenth in breadth, extremely thin and transparent, 
smooth, oblong, compressed at the sides, with the 
apex pointed and near the centre of the shell, in- 
clining towards the narrower end, and turning a 
little obliquely towards the left side.* 
The egg cases are very depressed, orbicular or 
* Mr. Guilding {Zool. Journ. iii. 535.) has described two 
West Indian species of this genus, which I have lately had the 
opportunity of reexamining and proving to be true Velletice^ 
which was doubtful from Mr. Guilding’s erroneous description 
of the animal. 
