Dr Fleming ow the British Testaceous Annelides. ^45 
verselv wrinkled, the whole less regular in its growth than the preceding, 
with the aperture more ascending. 
b. Shell destitute of longitudinal ridges. 
3. S. communis — Shell subtriangular, the base spreading. Serpula spir- 
orbis, Lin. Sjst. 1265 Penn. Brit. Zool. iv. p. 1245 — Mul. Zool. Dan. 
tab. Ixxxvi. f. 1,-6 Don. Brit. Sh. tab.ix. Everywhere common on old sea- 
weeds and shells. 
The shell is opaque, slightly wrinkled across, spreading at the base, and 
forms a very blunt ridge along the top, leaving a funnel-foim central ca- 
vity. The whorls are lateral, three or four in number ; the first and part 
of the second, however, generally concealed. According to Muller, the 
animal is of a blood colour, with a dark dorsal line formed by the intes- 
tine. The pinnated branchiae are six in number. The lid is peltate, 
terminating obliquely. 
4. S. spirilium — Shell rounded, base narrow. Serpula spir. Linn. Syst. 
1265. — Mont. Test. Brit. p. 499. — Pult. Dor. 2d ed. tab. xix. fig. 27. Com- 
mon on Corallina officinalis and algae. 
The shell is round, slightly wrinkled, glossy and subpellucid. The whorls 
are three, placed laterally, or sometimes rising one above the other, and 
having the margin of the mouth nearly free. The central cavity is more 
or less distinct, according to the manner of growth. There is reason to 
doubt if this be the Serpula spirilium of Pultney, Dorset, 1st ed. p. 52. 
since his specimens are stated to have been striated longitudinally. Pro- 
bably he referred to S. granulatus. 
5. S. corrugatus — Shell wrinkled, with the base a little spreading. Mont. 
Test. Brit. p. 502. On slate rocks at Milton, Devonshire. 
Tt is thus described by Montagu : “ With a strong spiral white shell, 
roughened by transverse wrinkles ; a small portion of the second volu- 
tion only visible ; centre umbilicated ; base very little spreading ; aper- 
ture orbicular. Diameter about |th of an inch.” — Animal orange-red, 
with eight greenish, ciliated rays (branchiae) ; and a subfunnel-shaped 
proboscis (lid) of the same colour.” 
6. S. MontaguL — Shell with one very thick, rounded, glossy, white volu- 
tion. Serpula, new species, Mont. Test Brit. p. 502. On Haliotis tubercu- 
lata from Guernsey, Montagu. 
The shell is very convex, and wrinkled transversely with a minute central 
cavity at top ; sometimes only a suture. The animal is of a buff colour, 
with ten ciliated rays, and a subfunnel-shaped lid, at one side, having a 
brown, ciliated, hyaline margin. 
7. S.incurvatus — Shell rounded, with three continuous whorls at the apex, 
with the anterior extremity produced and cylindrical. Serpula recta anfrac- 
tibus tribus contiguis regulariter involutis. Walker’s Test. Min. Bar. p. 3. 
tab. 1. f. 11. — Vermiculum incurvatum, Mont. Test. Brit. p. 518. From 
Sandwich, rare. Walker. 
8. S. pervius. — Shell rounded, with a single pervious whorl at the apex, 
and produced anteriorly into a cylindrical tube. Serpula recta umbilico pervio 
anfractu apicis unico involute — Walk. Test. Min. Bar. p. 4. tab. i. fig. 12 
Vermiculum pervium, Mont. Test. Brit. p. 518. From Beculver, rare, Wal- 
ker. 
9. S. retorta, — Shell with the last whorl concealing the others, circular, 
marginated, slightly depressed near the centre, with a conico-tubular produced 
lateral aperture. Serpula (Betorta) rotunda marginata cervice curvatim ex- 
erto. Walk. Test. Min. Bar. p. 3. tab. 1. fig. 10 Vermiculum retortum, Mont. 
Test. Brit. p. 524. Sandwich, Walker. 
VOL. XII. NO. 24 . APRIL 1825 . 
11 
