LlTUITES. 



CEPHALOPODA. 



i249 



5. BELEiraiTES LONGissiMUS. — The Lengthened Belemnites, 

 pi. XXIX.* figs. 13, 14. 



B. longissiiiiiis. Miller, Geo. Tr. 2ud. Ser. II. p. CO, pi. S, 

 figs. 1, -2. 



Guard very strong, much lengthened, smooth, and terminat- 

 ing in a conic point. 



The Lias, Lyme Kegis, Weston and Holland. 



6. Belemnites jaculum. — The Dart Belemnites, pi. XXIX.* 

 fig. 14. 



B. jaculum. Phillips, Geo. York. I. pi. ;i, fig. 1. 

 Spindle shaped, much accumunated behind, and terminating 

 in a rounded sub-conic point. 



The Specton Clay, Specton, Yorkshire. 



7. Belemnites TRiPARxiTrs. — The Three-parted Belem- 

 nites, pi. XXIX.* figs. 15, 16, 17, 18. 



B. tripartitus. Miller, Geo. Tr. 2nd Ser. II. p. fiO, pi. 8, 

 figs. 10, 11, 12, 13. 



Guard formed of three longitudinal portions, exhibiting, 

 near the apex, three distinct longitudinal ridges. 



The Lias, Lyme Regis, Dorsetshire. 



8. Belemnites ADUNCi^Tus. — The Hooked Belemnites. pi. 

 XXIX.* figs. 19, 20, 21. 



B. aduncatus. Miller, Geo. Tr. 2nd Ser. II. p. 59, pi. 8, 

 figs. 6, 7, 8. 



Guard cylindrical, very smooth, sometimes finely striated, 

 terminating in a hooked ape.x, which is furnished with four or 

 five ridges, the intervening furrows are sometimes slightly 

 tuberculated. ^ 



This species has a considerable resemblance to B. ahbre- 

 viatus, but is considerably more slender. 



The Lias, Lyme Regis and Weston. 



9. Belemnites electrinus. — The Amber Belemnites, pi. 

 XXIX.* figs. 23, 24. 



Guard cylindrical, the lower extremity conical, with a mani- 

 millated point ; amber coloured. 



When specimens are perfect, where the guard adheres to 

 the chambered cone, there is a longitudinal groove in the 

 centre. On the surface there are generally traces of blood- 

 vessels. An outline of these blood-vessels is represented in 

 fig. 12. 



In the Lias, Lyme Regis, Dorsetshire. 



10. Belemnites GiBSONi. — Gibson's Belemnites, pi. XXIX.* 

 fig. 28. 



B. Gibsoni. Brown, Tr. Man. Geo. Soc. I. p. 220, pi. 7, f 4 1 . 



Shell tapering gradually, smooth, and shining ; aperture 

 nearly circular. Length five-eighths of an inch, diameter at 

 aperture an eighth of an inch. 



Found at Crimsworth Dean, in the Limestone Shale. 



O. obtusa. Brown, Tr. Man. Geo. Soc. I. p. 219, pi. 7, f. 36. 



Shell erect, taper, slightly compressed ; surface smooth, 

 covered with undulating, transvei-se striie; the point for a 

 quarter of an inch destitute of stria;, ne.xt which the stria; are 

 very fine and close-set, gradually widening as they ascend, and 

 becoming more undulous. Diameter near the base three- 

 quarters of an inch, greatest known diameter an inch and an 

 eighth. 



In the Carboniferous Shale, High-Green Wood, near Heb- 

 den Bridge, Vale of Todmorden. 



2. Orthoceua MicRoscopicA. — The Microscopic Orthocera, 

 pi. XXIX.* figs. 26, 27. 



0. microscnpica . Brown, Tr. Man. Geo. Soc. I. p. 219, pi. 

 7, figs. 37, 38. 



Shell taper, smooth ; with the septa remote ; aperture semi- 

 oval. Length a line, thickness not the fourth of a line. 



In the Cai'boniferous Shale, High-Green Wood, Vale of 

 Todmorden. 



3. Oethocera ascicularis. — The Ascicular Orthocera, pi. 

 XXIX.* fig. 29. 



O. asckuAris. Brown, Tr. Man. Geo. Soc. I. p. 219, pi. 7, 

 fig. 39. 



Shell very long, and tapering rather abruptly ; smooth ; 

 septa numerous, transversely pai-allel, regular, and increasing 

 with age ; aperture circular ; siphuncle near to one side. 

 Length almost an inch and an eighth, diameter at aperture not 

 an eighth of an inch, and a third of an eighth at the base. 



Found in the soft Shale at Todmorden. 



4. Orthocera Brownii. — Brown's Orthocera, pi. XXIX.* 

 fig. 31. 



0. Brownii. Tr. Man. Geo. Soc. I. p. 219, pi. 7, fig. 40. 



Shell subulate, arcuated ; with seven longitudinal, elevated 

 ribs ; giving the shell a septangular form ; general surface 

 smooth ; septa numerous, undulating, more remote as they 

 ascend. Length one inch and a quarter, diameter one sixth. 



Found in the Ciu-boniferous Shale, Todmorden. 



5. Orthocera elongatus. — The Elongated Orthoceras, 

 pi. XXIX.* fig. 25. 



O. elongatus. Miller, Geo. Tr. 2nd Ser. II. p. 60, pi. 8, 

 fig. 19. 



Much elongated and accumunated, the chambered cone and 

 guard both terminating in a sharp point. 



The guard is very tliin, and in external appearance much 

 resembling a Belemnite, the surface being quite smooth, and 

 polished. 



The Inferior Oolite, Dundiy, Somersetshire. 



1. LiTuiTES oiGANTEUS. — The Gigantic Lituites, pi. III.* 

 1. Orthocera obtusa.— The Obtuse Orthocera, pi. XXIX.* figs. 1, 2, 3. 

 fig. 30. L. Giganteut. Sowerby, Sil. Syst. p. 022, pi. 1 1, fig. 4. 



