EXPLANATION OF PLATE 3 H. 



1 MACROCHILUS SPIEATUS (M'Coy). Moderately large specimen, shewing the cast in part ; from 



the carboniferous limestone of Lowick. 



2 Small perfect specimen, shewing the pad, filling the umbilicus. 



3 STRAPAROLLUS COSTELLATUS (M^Coy). Natui-al size, seen from above; from the carboni- 



ferous limestone of Lowick. 



3 a Profile. 



3 h Portion of surface, magnified two diameters. 



3 c Viewed from below. 



4 PRODUCTA ELEGANS (M<^Coy). Entering valve, natural size ; from the carboniferous limestone of 



Lowick. 



4 a Profile of receiving valve. 



4 h Front view of receiving valve. 



4 c Portion of surface of receiving valve magnified. 



5 LEPTiENA {Chonetes) CRASSISTRIA (M<^Coy). Receiving valve, natural size; from the carbonife- 



rous limestone of Derbyshire. 



5 a Portion of surface magnified. 



6 EDMONDIA SCALARIS (M'^Coy). Natural size; from the carboniferous limestone of Lowick. 



6 a Profile of surface. 



7 MACROCHILUS BREVISPIRATUS (M-^Coy). Small specimen, natural size, front view; from the 



carboniferous limestone of Lowick. 



8 Larger specimen, back view ; from the cai-boniferous limestone of Derbyshire. 



9 PLEUROTOMARIA ALTAVITTATA (M'^Coy). Natural size, depressed variety, front view; from 



the carboniferous limestone of Lowick. 



10 More elevated variety, natural size, back view. 



11 MURCHISONIA VERNEUILIANA, Var. Kendalensis (M-^Coy). Natural size, back view of elongate 



variety. 

 ] 2 Front view of slightly shorter variety. 



13 PLEUROTOMARIA DECIPIENS (M-^Coy). Natural size, conical variety; from the carboniferous 



limestone of Lowick. 



14 Elongate variety, with rounded whorls. 



1.5 NAUTILUS TUBEROSUS (M'^Coy). Section of mouth, natural size, shewing the broad concave 



periphery above ; from the carboniferous limestone of Derbyshire. 

 15a Direct view of periphery, reduced one-half linear. 



15 5 Side view, shewing the proportional size of the umbihcus, reduced one-half linear. 



15* NAUTILUS COSTATO-CORONATUS (M-Coy). Fragment of periphery, natural size; from the 

 carboniferous limestone of Lowick. 



16 NAUTILUS TROCHLEA (M'^Coy). Side view, reduced one-half hnear ; from carboniferous limestone 



of Kendal. 

 16a Transverse section of smaller specimen. 



17 ORTHOCERAS (l Cycloceras) CORNU-VACCINUM (M-^Coy). Reduced one-half hnear ; from cai-bo- 



niferous limestone of Lowick. 

 17 a Portion of surface, natural size. 



17 5 ■ Section and surface of septum, natural size. 



18 ORTHOCERAS (Cycloceras) FLEMINGI (M^Coy). Natm-al size of fragment; from the limestone of 



Lowick. 

 18 a Portion of ditto, magnified. 



18 5 Surface of slightly crushed septum, natural size. 



19 COCHLIODUS OBLONGUS (Ag.) Transverse polished section, magnified two diameters, of 



specimen shewing the succession of the teeth. 



