242 



ANNELIDA. 



Serpulites. 



Genus III.— SPIRORBIS.— L«?«arc^-. 



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 sinisteoesus. — 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-triangulai', diameter about an eighth of an inch. 



The Coral Crag, Sutton. 



2. Spirorbis corrugatds. — The Wrinkled Spirorbis, pi. 

 XCVIII. fig. 51. 



S. corrugatiis. Brown, 111. Rec. Conch. Brit. p. 124, pi. 56, 

 fig. 46. 



Strong, the last and second volutions only being visible, 

 deeply umbilicated ; base hardly spreading, apertui'e orbicular ; 

 diameter an eighth of an inch. 



The Pleistocene Marine Formation, Bute. 



3. Spirorbis caeinatus. — The Keeled Spirorbis, pi. 

 XCVIII. fig. 49. 



S. carinatus. Brown, 111. Rec. 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 geanulatcs. — The Grained Spirorbis, pi. 

 XCVIII. fig. 52. 



5. gramdatus. Brown, 111. Rec. Couch. 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. 111. 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 flat, spreading ; 

 aperture orbicular, diameter not an eighth of an inch. 



The Coral Crag, Sutton. 



6. Spirorbis Nautiloides.— The Nautilus-hke 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 mkdtus. — The Minute Spirorbis, pi. XCVIII. 

 fig, 44. 



S. minuta. Portlock, Geo. Rep. p. 363, pi. 12, fig. 93, h. 



Sinistral, inner volutions concealed ; surface smooth, not a 

 tenth of an inch in diameter. 



Cai'boniferous Limestone Shale, Tyrone. 



Genus IV.— CYCLOGYRA.— S. Wood. 



1. Ctclogtra GRANriATA. — The Grained Cyclogyra, pi. 

 XCVIII. fig. 27. 



C. granulata. Wood, An. Nat. Hist. 1842, p. 458, pi. 5, 

 fig. 8. Serpula granulata, 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. 



The Chalk, Norwicli and Swaffham. 



Genls v.— CORNUOIDES —Bromt. 



Shell tubular cylindrical, erect, abruptly tapering, and shghtly 

 convoluted at the smaller end, which is imperforate ; aperture 

 circular. 



1. CoRNuoiDEs MAJOR. — The Greater Comuoides, pi. 

 XCVIII. fig. 50. 



Serpula recta. Walker, Minute Shells, pi. 1. fig. 14. 



Smooth, with three nearly cylindrical volutions, the exterior 

 one abrubtly 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 vei-y 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 lamirue 

 of shell combined with much animal matter. 



The Upper Ludlow Rock, Ludlow and Kington. 



