248 



CEPHALOPODA. 



Belemnites. 



G. Longthorni. Brown, Tr. Man. Geo. Sec. I. p. 916, pi. 

 7, figs. 23, 24, 25, 26. 



Elliptical, sub-compressed ; with three rapidly increasing 

 volutions ; aperture ovate ; umbilicus small ; sides covered 

 with numerous, doubly arcuated, flat, indistinct ribs, septa 

 with all the lobes and sinuses rounded and equal. Diameter 

 twelve lines ; thickness half its diameter. 



In the young condition it is smooth, with directly transverse 

 constrictions. 



Found in the soft Shale, near Hebden Bridge. 



10. GoNiATiTEs Peoteus. — Proteus's Goniatites, pi. XXI.* 

 figs. 27, 28. 



G. Proteus. Tr. Man. Geo. Soc. I. p. 217, pi. 7. I 27, 28. 



Discoidal, compressed, lenticular ; volutions numerous ; um- 

 bilicus deep, funnel-shaped, e-Khibiting the margins of the 

 volutions, the external margins of which are enveloped in the 

 outer one ; mai-giu of umbilicus with an elevated ridge ; ambit 

 produced, slightly flattened in the centre, sides spirally striated, 

 and crossed by numerous, nearly obsolete, lines of growth ; 

 constrictions indistinct ; aperture oblong-ovate, equal to a third 

 of the diameter of the shell ; septa with all the lobes and 

 sinuses rounded. Diameter seven lines ; thickness two lines 

 and a fourth. 



In the young condition it is considerably compressed, and 

 the constrictions are distinct, broad, and deep ; these fill up as 

 the shell advances in growth. 



This shell may be distinguished from our G. Spirorbis, p. 30, 

 pi. 21, figs. 45, 46, in the umbilicus being smaller, and angular, 

 and in its being spirally striated, in the aperture being much 

 more elongated, in the ambit being m«re produced, and in the 

 indentations from the volutions being more acute, and following 

 the form of the septa. 



Found at Lob Mill, near Todmorden. 



11. GouiATiTES PARVUS. — The Small Goniatites, pi. XXI.* 

 figs. 32, 33. 



G. parvus. Brown, Tr. Man. Geo. Soc. I. p. 217, f 32, 33. 



Spheroidal, with straight constrictions ; umbilicus lai^e ; 

 surface covered with exceedingly minute, transverse striae ; 

 aperture semilunar ; septa with all the undulations low and 

 rounded ; dorsal sinuses very wide. Diameter three-fourths of 

 a line, thickness about the same. 



Found at Hoole Bottom, near Todmorden. 



12. Goniatites minutissimus. — The Very Minute Gonia- 

 tites, pi. XXL* figs. 29, 30, 31. 



G. minutissimus. Brown, Tr. Man. Geo. Soc. I. p. 218, pi. 

 7, figs. 29, 30, 31. 



Discoidal, sub-globose, smooth ; with three rounded volutions, 

 the inner ones only half concealed ; aperture semilunar ; um- 

 bilicus large, moderately deep ; septa unknown. Diameter 

 one-third of a line. 



Found in the Carboniferous Shale at Millwood, near Tod- 

 morden. 



13. Goniatites Smithii. — Smith's Goniatites, pi. XXL* 

 figs. 34, 35. 



G. Smithii. Brown, Tr. Man. Geo. Soc. I. p. 218, pi. 7, 

 figs. 34, 35. 



Discoidal, sub-globose, very thick ; sides narrow ; ambit very 

 broad, slightly produced in the centre ; umbilicus very large, 

 funnel-shaped, and deep, exposing the margins of the inner 

 volutions, and with an acute margin ; aperture semilunar ; 

 constrictions directly transverse ; the whole surface covered 

 with strong, regular, transverse, slightly waved strise ; aperture 

 semilunar, narrow. Septa dorsal lobe simple and rounded, 

 dorsal sinus rounded and very small ; first and second lateral 

 lobes angular, with their edges parallel ; lateral sinus rounded. 

 Diameter eight lines, thickness about sue lines and a half. 



This species differs from G. Listeri in the form of its septa. 



Found associated with the G. Proteus, at Millwood, near 

 Todmorden. 



14. Goniatites micronotus. — The Small Umbilicated Go- 

 niatites, pi. XXI. figs. 11, 11a, 12. 



G. micronotus. Phillips, Geo. York. II. p. 234, pi. 19, 

 figs. 22, 23. 



Sub-compressed ; surface with transverse strife, and the cc^- 

 strictions but slightly bent ; septa with the dorsal lobe small, 

 the fiist lateral lobes large and rounded, with their dorsal edges 

 parallel ; umbilicus small and rounded. 



The Carboniferous Limestone, Bolland. 



1 . Belemnites elltpticus. — The Elliptieal Belemnites, pi. 

 XXIX.* figs. 1, 2, and 22. 



B. ellipticus. Miller, Geo. Tr. 2nd Ser. II. p. 60, pi. 8, 

 figs. 14, 15, 16, 17. 



Guard much elongated, elliptical ; opaque, greyish-brown, 

 terminating in a mucronated point. 



In an early stage of growth, the guai'd is generally round, as 

 may be seen in the transverse sections, but becomes subse- 

 quently, by an opposition of laminae, of irregular thickness, of 

 an elliptical form. 



Fig. 2, a transverse section, and fig. 22 is a variety. 



Inferior Oolite, Dundry, Somersetshire. 



2. Belemnites elongatus. — The Elongated Belemnites, 

 pi. XXIX.* fig. 7. 



See page 42, No. 13, pi. XXIX. fig. 11. 



3. Belemnites abbreviatus. — The Shortened Belemnites> 

 pi. XXIX.* figs. 6, 8, p. 42, pi. XXIX. figs. 18, 19. 



4. Belemnites sulcatcs. — The Furrowed Belemnites, pt. 

 XXIX.* figs. 9and IJ. 



B. sulcatus. Miller, Geo. Tr. 2nd Ser. II. p. 59, jil. 8, figs. 

 3, 4, 5. Piatt. Hist. Oxford, pi. 3, fig. 6. 



Guard sub-cylindrical, elongated, and provided with a longi- 

 tudinal furrow, and terminating in an acute apex. 



The Inferior Oolite, Daudrv, Somersetshire. 



