GONIATITES. 



MOLLUSCA. 



29 



Subgloliose, the sides flattened, slightly striate trans- 

 versely, with a few longitudinal striae, and internal slightly 

 bent obscure ridges; umbilicus minute ; the septa delicately 

 marked and undulous ; edge of the dorsal lobe very short ; 

 the dorsal sinuses sharp, and the first lateral lobe rounded. 



Distinguished _ from the G. striolatus, by its more parallel 

 sides. 



Discovered at Black Hall, Bolland, Queen's County, 

 Ireland. 



7. G. NiTiDUs — The Clear Goniatite, pi. XXI. fig. 13, 

 14. 



Gotiiatites nitidus. Phillips, Geology of Yorkshire, II. p. 

 235, pi. 20, fig. 10 to 12. 



Subglobose; sides crossed, with slightl}' bent, prominent, fur- 

 cate strias, and with obsolete spiral stri;B ; umbilicus wide and 

 angular ; aperture semilunar, and transversely elongate ; septa 

 irregular in form, with dorsal lobes simple, small, and large, 

 acute lateral lobes. 



Discovered at Ribble River. 



8. G. SERPENTiNus. — The Serpentine Goniatite, pi. XXI. 

 fig. 16, 17. 



Goniatifes serpentinus. Phillips, Geology of Yorkshire, 

 II. p. 237, pi. 20, fig. 48 to 50. 



Discoidal, with three rapidly increasing, wholly exposed 

 volutions ; sides covered with transverse, delicate, bentstrite; 

 aperture almost circular, very slightly indented by the pre- 

 ceding volutions; with three approximating, round-Iobed 

 septa ; two round lateral sinuses, and a central acute dorsal 

 sinus. 



Found at Bolland, Queen's County, Ireland. 



9. G. DiscoRS — The Discordant Goniatite, pi. XXI. fig. 

 18 and 18.* 



Goniatifes Gilhertsoni. Phillips, Geology of Yorkshire, 

 II. p. 238, pi. 20. fig. 29, 30. 



Discoidal, smooth, sides with falcate, very minute striee ; 

 aperture oblong ovate ; septa numerous, with rounded lobes 

 and sinuses ; dorsal sinus wide and double, with a simple 

 lateral sinus. 



This species difliers from G. Gilhertsoni, fig. 2, in not being 

 depressed, in the disk being more orbicular, and in the aper- 

 ture being less indented by the volution. 



Found at Bolland, Queen's County, Ireland. 



10. G. cYCLOLOBUs. — The Round Lobed Goniatite, pi. 

 XXI. fig. 19, 20. 



Goniatifes cyclolobus. Phillips, Geology of Yorkshire, II. 

 p. 237, pi. 20, fig. 40 to 42. 



Discoidal ; with three or four half exposed volutions, with 

 their sides flattened ; ambit broad and round ; aperture 

 oblong, its sides flat and rounded, its breadth two-thirds its 

 length ; septa having four rounded lateral lobes, a small double 

 dorsal lobe, and small pointed dorsal sinuses ; first lateral 

 sinus double, the next simple, and all of them rounded. 



Found at Glassington, Yorkshire. 



11. G. MixoLoBus. — The Mingling Lobed Goniatite, pi. 

 XXI. fig. 21, 22. 



Goniatifes mixolobus. Phillips, Geology of Yorkshire, 

 II. p. 237, pi. 20. fig. 43 to 47. 



Discoidal ; with five rapidly enlarging volutions, the inner 

 ones slightly concealed ; septa with four rounded lateral 

 lobes ; the first lateral sinus double and acute ; the second 

 single and pointed ; and the dorsal lobes and sinuses acute. 



Discovered at Bolland, Queen's County, Ireland. 



12. G. GiBsoNi. — Glljson's Goniatite, pi. XXI. fig. 23, 

 24, 25. 



Goniatifes Gibsoni. Phillips, Geology of Yorkshire, 11. p. 

 236, pi. 20, fig. 13 to 18. 



Discoidal, with five two-thirds concealed volutions, which 

 are provided with bent, acute rilis ; these are prominent on 

 the margin, and become furcate on the sides as they approach 

 the ambit ; and passing over the back meet with the furca- 

 tions on the opposite side ; destitute of spiral striee, but the 

 sides provided with a few curved constrictions. In the 

 young state this species is somewhat flattened, with apparent 

 volutions, but in older shells the volutions gradually become 

 more involute and gibbous. Diameter, a quarter of an inch. 



Found at High-Green Wood. 



This curious fossil is not unlike some Ammonites of the 

 Oolite formation. 



13. G. VESICA.— The Bladder Goniatite, pi. XXI. fig. 26, 27. 

 Goniatifes vesica. Phillips, Geology of Yorkshire, II. p. 



236, pi. 20, fig. 19, 20, 21. 



Subglobular, umbilieate, with two volutions, tiie central 

 one extremely small, the outer one very large ; umbilicus 

 much rounded ; sides transversely and delicately striate ; 

 undulations of the septa low and rounded ; dorsal sinuses 

 very shallow ; aperture semilunar ; thickness equal to two- 

 thirds of the diameter. 



Found at Black Hall, in the Kulkeagh Shale, at Bolland. 



This species differs but little in its young and adult state. 



14. G. iNTERcosTALis — The Interribbed Goniatite, pi. 

 XXI. fig. 28, 29. 



Goniatifes infercosfalis. Phillips, Geology of Yorkshire, 

 II. pi. 237, p. 20, fig. 61, 62. 



Discoidal, with three rapidly increasing volutions ; sides 

 crossed by claviform ribs, which emanate from the inner 

 margin of the volutions, and extend about three-fourths 

 across the sides ; the whole shell with spiral intercostal strife ; 

 ambit round, slightly produced in the centre ; aperture trans- 

 versely elongated ; narrowed internally. 



Found at Bolland. 



15. G. ROTiFoRMis. — The Wheel Shaped Goniatite, pi. 

 XXI. fig. 30, 31. 



Goniatifes rotiformis. Phillips, Geology of Yorkshire, II. 

 p. 237, pi. 20, fig. 56, 57, 58. 



Discoidal, carinated, with six half concealed angular volu- 

 tions ; ambit provided w ith a truncated carina ; sides with 

 transverse furrows, which are placed only on the centre of 

 the volutions, and do not reach the sides. 



16. G. EVOLUTUS. — The Unfolded Goniatite, pi. XXI. fig. 

 32, 33. 



Goniatites evohUus. Phillips, Geology of Yorkshire, II. 

 p. 237, pi. 20, fig. 65 to 68. 



Discoidal, umbilieate ; with three apparent rapidly increas- 

 ing volutions ; aperture oblong, with rounded angles ; septa 

 with a deep and acute dorsal sinus ; the first lateral lobe 

 obtuse and angulated. 



In the young condition, the section of the volutions is 

 round, and oblong in the adult state. 



Found at Flasby. 



17- G. LiSTERi Lister's Goniatite, pi. XXI. fig. 34. 



Goniatites Lisferi. Phillips, Geology of Yorkshire, 11. p. 

 235, pi. 20, fig. 1. 



Spheroidal, umbilieate ; the inner volutions concealed by 

 the outer one, and their edges only being visible within the 



