150 SERPULA. CREEPER. 
pi. 2. f. 11— Donovariy pi. 9. f. 1,2— Dorset Cat. pi. 22. 
i. 11. 
Shell white, opake, orbicular, regular, spires four or five, 
smooth or very slightly wrinkled, rounded and concave on 
the upper part and slightly grooved round the volutions, 
beneath flatfish, and somewhat perforated : aperture orbi¬ 
cular, sometimes erect or looking upwards, and sometimes 
one ov two of the volutions turn a little upwards : diame¬ 
ter the eighth of an inch. 
On stones, shells, and sea-weed. v. v. 
2. Serpula Spirillum. Twisted Creeper. 
Dorset Cat. pi. 19. f. 27-* 
Shell glossy white, semitransparent, orbicular, regular: 
spires two or three, slightly wrinkled and mostly placed 
laterally, the base not at all spread but quite cylindrical, 
with a central perforation which sometimes goes quite 
through the shell: aperture often turning a little upwards, 
exactly circular and not thinner than the rest of the shell, 
but appearing as if regularly cut off, with the volutions 
ascending or rising one upon another: diameter about a 
line. 
Variety. With the volutions reversed. 
Serpula sinistrorsa. Montagu, p. 504— Walker , f. 13,14, 
On Fuci, and Sertularias, v. v. 
3. Serpula minuta. Minute Creeper. 
Montagu , p. 505. no. 9. 
Shell dirty white, opake, orbicular: spires two or three, 
turning in a contrary direction, rounded at the base, trans¬ 
versely wrinkled, with sometimes a slight circular ridge 
running spirally along the back formed by a small furrow 
on each side : very minute. 
On the Corallina officinalis, v. v. 
4. Serpula granulata. Granular Creeper. 
Donovan , pi. 100. 
Shell white, opake, clustered, round, not quite regular: 
spires two or three, slightly perforated in the middle, 
with three raised ribs round the top, and wrinkled trails* 
