240 
ANNELIDA. 
Serpula. 
Tube with three elevated, sharp, serrated keels; aperture 
circular. 
The Upper Chalk, Norwich. 
17. Serpula capitata. —The Headed Serpula, pi. XCVIII. 
fig. 43. 
S. capitata. Phillips, Geo. York. I. pi. 14. fig. 16. 
Tube circular, smooth, variously bent, with irregular lings, 
both in size and disposition; a large termination in the form 
of a head. 
The Lias, Robin Hood s Bay, Yorkshire, and Lyme Regis. 
18. Serpula deplexa.— The Winding Serpula, pl.XCVIII. 
fig. 13. 
S. deplexa . Phillips, Geo. York. I. pi. 11, fig. 06. 
Tube cylindrical, smooth, winding in different directions. 
The Inferior Oolite, Blue Wick, Yorkshire. 
10. Serpula Extensa.— The Swollen Serpula, pi. XCVIII. 
fig. 38. 
S. cxtensa. Brander, Fos. Hant. pi. 1, fig. 12. 
Cylindrical, tumid, smooth, with obscure lines of growth; 
aperture circular. 
The London Clay, Fiord well. 
20. Serpula plana.— The Flat Serpula, pi. XCVIII. fig. 4 J. 
S. plana. Woodward, Geo. Norf. pi. 5, fig. 9. 
Convoluted, depressed, surface smooth ; aperture circular. 
The Chalk, Norwich. 
21. Serpula filiformis. —The Thread-shaped Serpula, pi. 
XCVIII. fig. 14. 
S. filiformis . Sowerby, Geo. Tr. 2nd Ser. IV. pi. 16, fig. 2. 
Tube smooth, cylindrical, of nearly equal diameter through¬ 
out ; slightly curved, generally consisting of masses laid side 
by side, a certain number taking the same curvature, and laid 
in one direction ; sometimes in branched masses. 
The Greensaud, Blackdown. 
22. Serpula socialis. — The Associated Serpula, pi. 
XCVIII. fig. 22. 
S. socialis. Portlock, Geo. Rep. p. 362, pi. 25, A, fig. 
9, a. b. 
Tube long, thin, smooth, thread-like, and almost straight, 
loose or bent in all directions, aggregated together in bundles 
of from two to four inches long; single tubes are of equal thick¬ 
ness throughout; but the fasciculi are of different dimensions. 
The Carboniferous Limestone, Clogher, Tyrone. 
23. Serpula tuba.— The Tubular Serpula, pi. XCVIII. 
fig. 17. 
S. tuba. Sowerby, Geo. Trans. 2nd Ser. IV. p. 340, pi. 16, 
fig. 3. 
Tubes simple, generally solitary, or seldom exceeding two 
united ; of uniform diameter throughout; shell thin. 
The Greensand, Blackdown. 
24. Serpula vermes. —The Worm Serpula, pi. XCVIII- 
fig. 11*. 
S. vermes. Sowerby, Geo. Tr. 2nd Ser. IV. p. 340, pi. 16. 
fig. 4. 
Tube gradually increasing in size, as it advances in age, and 
provided with a pretty deep keel along its surface, which is 
wrinkled transversely. 
The Greensand, Blackdown. 
25. Serpula jieptagona. —The Seven-sided Serpula, pi. 
XCVIII. fig. 33. 
Dentalium elephantimnn. Brander, Fos. Hant,pi. I. fig. 11. 
Tube gradually tapering, with seven rounded longitudinal 
keels, or projections; aperture heptagonal. 
The London Clay, Hordwell. 
26. Serpula triserrata. —The Three-serrated Serpula, 
pi. XCVIII. figs. 1,2. 
S. triserrata. Sowerby, Geo. Tr. 2nd Ser. p. 347, pi. 23, 
fig. 8. 
Tube attached, thick, triangular, with three thin serrated 
keels upon its upper angle. 
The Portland Stone, East side of Portland. 
27. Serpula vari.ybtlis. —The variable Serpula, pi. 
XCVIII. fig. 18 
S. variabilis. Sowerby, Geo. Tr. 2nd Ser. IV. p. 347, pi. 
23, fig. 7. 
Tube cylindrical, rough, and having an irregular suture on 
one or more sides; a considerable portion attached to extra¬ 
neous bodies; when young the attached portion is triangular. 
28. Serpula intestinalis. — The Intestinal Serpula, pi. 
XCVIII. fig. 46. 
S. intestinalis. Phillips, Geo. York. I. pi. 5, fig. 21. 
The outer portion of the tube straight, the lower part twisted ; 
surface rather rough, with a waved keel on its back; aperture 
round ; shell strong. 
The Oxford Clay, and Cornbrash, Scarborough. 
29. Serpula lacerata. — The Lacerated Serpula, pi. 
XCVIII. fig. 32. 
S. lacerata. Phillips, Geo. York. I. pi. 4, fig. 35. 
Tube moderately curved, circular, and rather rough ; aperture 
round, with a slight scar; shell thick. 
The Calcareous Grit, and the Great Oolite, Scarborough. 
30. Serpula squamosa. —The Scaly Serpula, pi. XCVIII. 
fig. 37. 
S. Squamosa. Phillips, Geo. York. I. pi. 4, fig. 15. 
Compressed; rapidly increasing in width, the surface with a 
keel along the back ; surface covered with scales. 
The Coral Rag, Scarborough. 
31. Serpula vortex. —The Whirled Serpula, pi. XCVIII. 
tig. 4 7. 
S. vortex. Woodward, Geo. Nor. pi. 5. figs. 10, 11, 12. 
Sub-conic, with four spiral, rounded, smooth volutions, 
flattened below'. 
The Upper Chalk, Norwich. 
