242 
ANNELIDA. 
Serpulites. 
Genus III.—SPIRORBIS.— Lamarck. 
Shell consisting of a testaceous tube, spirally twisted into 
an orbicular form, on a horizontal plane, depressed, and adher¬ 
ing below ; aperture terminal, rounded or angular. 
1. Spirorbis sinistuousus. —The Sinistral Spirorbis, pi. 
XCVIII. fig. 53. 
Serpula sinistrorsa. Montague, p. 504. 
Sub-depressed, with two or three sub-cylindrical sinistral 
volutions, slightly wrinkled, and somewhat lateral; aperture 
sub-triangular, diameter about an eighth of an inch. 
The Coral Crag, Sutton. 
2. Spirorbjs corrugatus. —The Wrinkled Spirorbis, pi. 
XCVIII. fig. 51. 
S. corrugatus. Brown, Ill. Rec. Conch. Brit. p. 124, pi. 56, 
fig. 46. 
Strong, the last and second volutions only being visible, 
deeply umbilicated ; base hardly spreading, aperture orbicular; 
diameter an eighth of an inch. 
The Pleistocene Marine Formation, Bute. 
3. Spirorbis carinatus. — The Keeled Spirorbis, pi. 
XCVIII. fig. 49. 
S. carinatus. Brown, Ill. Hoc. Conch. Brit. p. 124, pi. 56, 
fig. 48. 
Exterior volution angulated, and provided with a dorsal keel; 
interior volutions entirely concealed; umbilicated; aperture 
orbicular. ' 
The Coral and Red Crags, Sutton. 
4. Spirorbis gbanulatus. —The Grained Spirorbis, pi. 
XCVIII. fig. 52. 
5. (jramdatus . Brown, Ill. Rec. Conch. Brit. p. 123, pi. 56, 
fig. 48. 
Sub-depressed, with the volutions deeply grooved spirally, 
and transversely wrinkled, more so in the furrows; umbilicated; 
aperture orbicular, with an annular margin; diameter an eighth 
of an inch. 
The Coral Crag, Sutton. 
5. Spirorbis heterostrophus. —The Reversed Spirorbis, 
pi. XCVIII. fig. 56. 
5. heterostrophus. Brown, Ill. Rec. Conch. Brit. p. 123, 
pi. 56, fig. 55. 
With two or three reversed volutions, and three lateral 
spiral ridges, crossed by strong wrinkles ; base fiat, spreading; 
aperture orbicular, diameter not an eighth of an inch. 
The Coral Crag, Sutton. 
6. Spirorbis Xautiloides.— The Nautilus-like Spirorbis, 
pi. XCVIII. fig. 48. 
S. Nautiloides. Brown, 111. Rec. Conch. Brit. p. 123, pi. 
56. fig. 45. 
With three or four lateral volutions, rounded above, and 
slightly wrinkled transversely; the central volution lower than 
the others, forming an umbilicus ; base flat, expanded; aperture 
sub-triangular. 
The Pleistocene Marine Formation, Ayr. 
7. Spirorbis minutus. —The Minute Spirorbis, pi. XCVIII. 
fig, 44. 
S. rninuta. Portlock, Geo. Rep. p. 363, pi. 12, fig. 93, b. 
Sinistral, inner volutions concealed ; surface smooth, not a 
tenth of an inch in diameter. 
Carboniferous Limestone Shale, Tyrone. 
Genus IV.—CYCLOGYRA.—S. Wood. 
1. Cyclogyra granulata. —The Grained Cyclogyra, pi. 
XCVIII. fig. 27. 
C. granulata. Wood, An. Nat. Hist. 1842, p. 458, pi. 5, 
fig. 8. Serpula granulata 1 Sowerby, VI. p. 200, pi. 597, figs. 
7, 8. 
Discoidal, thick ; surface with rows of very prominent grains ; 
aperture nearly circular, its lip fringed with protuberant grains, 
diameter something more than an eighth of an inch.. 
o o 
The Chalk, Norwich and Swaffham. 
Genus V.—CORNUOIDES —Broun. 
Shell tubular cylindrical, erect, abruptly tapering, and slightly 
convoluted at the smaller end, which is imperforate; aperture 
circular. 
1. Cornuoides major. — The Greater Cornuoides, pi. 
XCVIII. fig. 50. 
Serpula recta. Walker, Minute Shells, pi. 1. fig. 14. 
Smooth, with three nearly cylindrical volutions, the exterior 
one abrubtiy enlarging, and prolonged in a lengthened, nearly 
cylindrical, straight tube; aperture orbicular, diameter an 
eighth of an inch. 
The Coral Crag, Sutton. 
Genus VI.—SERPULITES. 
1 . Serpulites longissisimus. —The very Long Serpulites. 
pi. XCVIII. fig. 39. 
S. longissisimus. Sowerby, Murchison, Sil. Syst. p. 608, pi. 
5, fig. 1. 
Much lengthened, hardly diminishing in diameter, com¬ 
pressed, smooth, and a little tortuous, composed of thin laminae 
of shell combined with much animal matter. 
The Upper Ludlow Rock, Ludlow and Kington. 
