DESCRIPTION OF THE FOSSILS. 
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G. implicates. Ph. PI. XIX. fig. 24, 25. Black Hall in Bolland. 
Subglobose, shell delicately striated across ; septa more numerous than in the last, 
less waved on the edge ; first lateral lobes widely rounded, their dorsal edges parallel, 
dorsal lobe very small, dorsal sinuses rounded. 
G. reticulates. Ph. PI. XIX. fig. 26 — 32. High-Green-wood ; Holm- 
firth ; Marsden ; Wyersdale ; Flashy. 
Adult depressed, back angulated, umbilicus angular, shell crenulato-striate. 
Young subglobose, umbilicus rounded, shell with acute radiating forked striae, crossed 
by fine spiral lines. Septa ; dorsal lobe short, first laterals rounded, large, their dorsal 
edges parallel. Constrictions even in the youngest much bent ; greatly bent in the old. 
In old specimens the cast of the inside is very much undulated. Fig. 31, 26, and 27, 
give the changes of aspect ; 30, the striae when young ; 32, the same when old ; 29, the 
septa. 28, the section across the centre. 
G. excavatus. Ph. PI. XIX. fig. 33, 35. Bowes ; Bolland ; Flashy. 
A shell closely allied to the preceding if not the same ; the lateral sinus of the 
septa more acute ; the young destitute of spiral striae ; edge of umbilicus acute, surface 
of old shells not angular. 
G. Listeri. (Ammonites, Sow.) PI. XX. fig. 1. Halifax; near Shef- 
field ; near Colne ; Holmfirtli, Saddleworth. 
Spheroidal, umbilicus wide, acute, its edges plaited, crenate or dentate ; shell 
transversely striated, most distinctly so when young. Constrictions nearly direct ; dorsal 
lobe double, dorsal sinus angular, deep, first lateral lobe ample, very round, lateral sinus 
angular, deep. The septa of the young differ but little from those of the old shells, 
except in the blunting of the angles as I have found by breaking several fine specimens 
from Halifax. 
G. hidorsalis. Ph. PI. XX. fig. 2, 3, 4. In shale, Woodfold. 
Subglobose, umbilicate ; with sigmoidal sharp radii, crossed by spiral striae ; lateral 
lobes and sinus round, dorsal lobe double, each part divided. The form of the septa 
distinguishes it from the young of G. variabilis. 
G. platylobus. Ph. PI. XX. fig. 5, 6. Bolland. 
Subglobose, umbilicus moderate, crenate, shell with obsolete spiral striae, constric- 
tions direct, sutural lobes and sinuses rounded ; dorsal lobe wide. 
G. stenolobus. Ph. PI. XX. fig. 7 , 8, 9- Bolland. 
Subglobose, umbilicus moderate, shell minutely rugose, constrictions direct : sutural 
lobes and sinuses rounded, dorsal lobe narrow. 
G. nitidus. Ph. PI. XX. fig. 10, 11, 12. Ribble river. 
Subglobose, umbilicus wide, angular ; striae slightly bent, prominent, forked. 
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