30 



MOLLUSCA. 



GoNIATITES. 



umbilicus ; outer volution obsoletely striated transversely ; 

 constrictions nearly direct ; umbilicus very wide, deep, and 

 acute, with the edges plaited, crenated, or dentated ; provided 

 with a double dorsal lobe, an angular deep dorsal sinus ; first 

 lateral lobe ample ; an extremely round, angular, deep lateral 

 sinus. 



In the young state the transverse strite are very distinct, but 

 become nearly invisible ; when old, the septa vary but slightly ; 

 in the yeung and old shells, only, the angles are blunted. 



This handsome Goniatife is by no means rare, for it is 

 found near Sheffield, Halifax, Colne, and Holmsfrlth, Saddle- 

 worth. 



18. G. TRUNCATUS. — The Truncated Goniatite, pi. XXI. 

 fig. 35, 36. 



Goniaiiles Irwtcaltts. Phillips, Geology of Yorkshire, II. 

 p. 234, pi. 19, fig. 20, 21. 



Diseoidal, umbilicate, much compressed ; inner volutions 

 entirely concealed ; sides covered with ti'ansverse, strong, 

 bent striie, which do not all extend from the ii'avgins to the 

 back, but have from t«o to tliree intermediale ones, betwixt 

 the longer striae ; ambit in adult shells flattened ; aperture 

 elongated, narrowed next the ambit ; and the contiguous 

 volution intruding about one-third its length. 



Found at BoUand. 



19. G. CARINA Tiie Keeled Goniatite, pi. XXI. fig. 



87, 38. 



GoHiaiites carina. Phillips, Geology of Yorkshire, II. 

 p. 237, pi. 20, fig. 63, 64. 



Lenticular ; smooth, ambit provided with a sharp keel ; 

 aperture subcordate. 



Found at Bolland, Queen's County, Ireland. 



20. G. viTTiGER The Filleted Goniatite, pi. XXI. 



fig. 39, 40. 



Gonuilites viuiger. Phillips, Geology of Yorkshire, II. 

 p. 237, pi. 20, fig. 59, 60. 



Lenticular ; carinated ; with five smooth two-thirds con- 

 cealed volutions ; ambit i)rovided with a flattened carina. 



Found at Bolland, Queen's County, Ireland. 



21. G. RETicuLATUS. — The Reticulated Goniatite, pi. X.XI. 

 fig. 41, 42. 



Goniatites reticulatus. Phillips, Geology of Yorkshire, II. 

 p. 235, pi. 19, fig. 26 to 32. 



Diseoidal, compressed, in the adult state, urabilicate ; 

 inner volutions entirely concealed ; sides of outer volution 

 crossed by numerous strong-, bent striiB, whicii eman;ite from 

 the inner margin of t'le volutions and before reaching the 

 ambit bend suddenly backwards ; these are crossed by rather 

 wide spiral striiB which produces a somewhat reticulated 

 appearance ; umbilicus, large, deep, and angular ; ambit 

 angulated ; septa with a sliort dorsal lobe, the first laterals 

 rounded, large, with their dorsal edges parallel ; constrictions 

 greatly bent. 



The young shell is subglobose, with a rounded umbilicus, 

 and the outside with radiating furcale strise crossed by fine 

 spiral striae ; the constrictions much bent, in adult speci- 

 mens the cast of the inside is considerably un<iulated. 



Found at Fla&by, Marsden, Wyersdale, Holmfrith and 

 High-Green Wood. 



22. G. CRKNisTRiiE. — Tiic Cfenulated-Slriate Goniatite, 

 pi. XXL fig. 44 and 49. 



Goniatites crenislrice. Phillips, Geology of Yorkshire, II. 

 p. 234, pi. 19. fig. 7, 8, 9. 



Subglobose, umbilicate ; inner volutions entirely con- 

 cealed ; sides with fine creuulated, reticulated, elegantly 

 curved striae ; the longer ones emanating from the inner 

 margins, and passing over the ambit, proceed continuouslj' 

 to the margins of the opposite side ; these have from one to 

 three intermediate shorter striEe betwixt them ; umbilicus 

 very small and rounded ; septa with the dorsal lobe bifid ; 

 dorsal sinus acute ; first lateral lobe sub-acute, double the 

 length of the dorsal lobe ; second lateral lobe obtusely roun- 

 ded, shorter than the first; marginal sinus angular. 



Some varieties are more globose than our figure. 



Found in the Isle of Man, Bolland, Queen's County, and 

 Fermanagh, Ireland. 



23. G. sPiBOKBis. — The Winding Goniatite, pi. XXI. 

 fig. 45, 46. 



Goniatites spirorbis. Phillips, Geology of Yorkshire, II. 

 p. 237, pi. 20, fig. 51 to 35. 



Diseoidal ; with seven or eight, rounded or oval, half 

 exposed, compressed volutions ; coiled in the manner of a 

 watch spring, crossed by extremely fine slightly oblique 

 strise, and divided by a deep angulated suture ; aperture 

 longitudinal, oblong-ovate, slightly indented by the last 

 volution ; septa with two rounded lateral sinuses, and an 

 acute central dorsal sinus. 



In the young state this species is nearly globular, with a 

 semilunar, transverse aperture. 



Found at Black Hall, Bolland, Queen's County, Ireland. 



24. G. sTENOLOBus. — The Narrow Lobed Goniatite, pi. 

 XXI. fig. 47, 48. 



Goniatites stenolobus. Phillips, Geology of Yorkshire, II. 

 p. 235, pi. 20, fig. 7, 8, 9. 



Subglobular, umbilicate ; inner volutions entirely con- 

 cealed, outside covered with minute rugosities, and direct 

 constrictions ; umbilicus of moderate size ; lobes and sinuses 

 of the suture rounded ; dorsal lobe nanow. 



Found at Bolland, Queen's County, Ireland. 



25. ii. EXCAVATUb. — The Excavated Goniatite, pi. XXI. 

 fig. 49, 50. 



Goniaiiles excavalus. Phillips, Geology of Yorkshire, II. 

 p. 235, pi. 19, fig. 33, 34, 33. 



Depressed, urabilicate ; inner volutions entirely concealed ; 

 ambit angu'aicd ; sides with somewhat crenulate transverse, 

 undulaiing slightly furcated striae, whicli curve suddenly 

 as they pass over the ambit ; constrictions considerably 

 waved ; umbilicus large and acute ; lateral sinuses as in G. 

 reticulatus. No. 21, but more acute. 



The young shells are destitute of spiral stria:. 



Found at Bowes, Bolland, Queen's County, Ireland, and 

 also at Flasby. 



Professor Phillips thinks it possible that this may be only 

 a variety of Goniaiiles reticulalus. 



26. G. OBTusus. — The Obtuse Goniatite, pi. XXI. fig. 51, 

 52, and 57- 



Gonialiies obtusus. Phillips, Geology of Yorkshire, II. 

 p. 234, pi. 19, fig. 10, 11, 12, 13. 



Subglobose, umbilicate ; inner volutions wholly concealed ; 

 sides flattened, covered with delicate, transverse, elegantly 

 bent and furcale stria; which sweep backwards as they pass 

 over the broad and rounded ambit ; there are also a few 

 faint longitudinal striae, and some internal slightly bent 

 ridges ; aperture oblong-ovate ; narrowed behind the bodj', 

 volution intruding upon it about one-third, and the internal 



