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436*
Helerodisca heterostropha Flem. Edinb. Journ. 1825. p. 247.
Spirorbis heterostropha Thorpe Brit. Mar. Conch. p. 10.
Hab. on oysters and other shells, and marine Algæ, in
Kingsbridge Bay, Devonsliire (Mtg.), on sheltered situations (Flenig.)
120- SPIRORBIS MINUTUS MONTG.
Sh. regidat*, spiral, and orbicidar, ivilh the whirl reversed, taper,
and transversely wrinkled. (Mtg. Dill.) Very small, dir ly white,
ruith 2 or 3 lateral volutions, wrinkled transversely: sometimes it has
a slighl longitudinal furrow, on each side, forming a ridge, o?’ carina,
along the back. Diam. | lin. (Mtg.)
Branchiæ ciliated; a clavate lid, varying in colour from brown
to green. (Mtg.)
Serpula minuta Mont. Test. brit. p. 505. (ed. Chenu. p. 220. 9.)
»» » Mat. & Rack. Lin. Trans. VEL p. 246. (ed.
Chenu. p. 238.)
» ). Turt. Diet. p. 150.
»» Dill. Cat. p. 1072.
Spirorbis minutus Flenig Edinb. Ene. VII. p. 68. t. CCY. f. 2.
Heterodisca minuta Flenig Edinb. Phil. Journ. 1825. p. 247.
Serpula minuta Brown 111. t. 1. f. 51.
» » Wood Index t. 38. n. 7.
» » Thorpe Marine Conch. p. 11.
Hab. the sea on Corallina officinalis; frequent on the English
coasts. (Mtg.) On substances exposed directly to the motion of the
waves. (Flemg.)
Not easily distinguished from S. heterostropha, except by its
inferior size, rounded base, and habits. (Mtg.)
121. SPIRORBIS ZELANDICUS GRAY.
Sh. reversed, whirls two or three, rapidly enlargiug; the last
with three spiral rid ges, the middle rib most prominent. (Gray.)
Spirorbis zelandica Gray Diefienb. N. Zealand 1843. p. 295.
Hab. Great Barrier Island, on Patella Hookeri. (Gray.)
122. SPIRORBIS TRICOSTALIS LAM.
T. anfractibus subdiscoideis; costis tribus rotundatis; apertura
subrotunda. (Lam.)
Spirorbis tricostalis Lam. V. 1818. p. 360. n. 3. (éd. 2. p. 614.)
» » Blv. Diet. sc. t. 50. p. 302.
» » Chenu 111. conch. p. 3. n. 8. t. 2. f. 8.
t. 1. f. 5.
Hab. Port Roi Georges, Nouvelle Hollande. (Lam.)
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