SERPULA. CREEPER . 
152 
laterally, sometimes turning on one another with theaper- 
tare pointing upwards, and sometimes the volutions are 
not joined together : diameter half a line. 
On Sertularisc* v. v. 
9. Serpula cornea. Linn. Trans, v. pi. 1. f. 33 to 35. 
Shell brownish horn-color, transparent, rounded, with 
three volutions : minute. 
An obscure species. 
B. Attached , and irregularly twisted, 10 to 15. 
10. Serpula vermicularis. Twining Creeper. 
Pennant , pi. 94. f. 3— Da Costa , pi, 2. f. 5—Dorset Cut. 
pi. 22. f. 5. 
Shell white or reddish, opake, quite. cylindrical and not 
spreading at the base, rugged with transverse wrinkles, 
gradually tapering to a point, variously curved and entwined 
in all directions, and attached its whole length. 
Variety A. Much smaller, and more grouped and en¬ 
twined together, of a clear and rather glossy white, and 
very slightly wrinkled transversely. 
Serpula in trie at a. Pennant , pi. 94. f. 2. 
Variety B. With a more or less elevated rib along the 
middle of the hack, but differing from S. triquetra in not 
being in the least spreading at the base. 
Serpula contortuplicata. Limit, Syst. p. 1266. 
Variety C. With the aperture turning in a reversed di, 
rection. 
Serpula reversa, Montagu , p. 508. no. 11. 
On shells, crabs, and stones, v. v, 
11. Serpula triquetra. Triangular Creeper. 
Pennant, pi. 94. f. 3— Da Costa, pi. 2. f. 9 — Donovan , 
pi. 95— Dorset Cat. pi. 22.. f. 9. 
Shell white or tinged with red, opake, attached its whole 
length, with an acute ridge down the hack and a little 
spread on the sides at the base, giving it a triangular ap¬ 
pearance, rather lugged with transverse strife, sometimes 
running nearly straight, but generally coiled and twisted 
in every direction; aperture round, even and truncate: 
sometimes 
