1862.] HODGSON TTLVERSTON. 19 



Plate VII. 



Fig. 1. Ceratites Flemingianus, De Kon., half the natural size, seen in profile. 



1 a. Transverse section of the same, half the natural size. 



2. Ceratites latifimbriatus, De Kon., natural size, seen in profile. 



2 a. Contour of the same, seen in front. 



3. Macrocheilus depilis, De Kon., natural size, back view. 



Plate VIII. 



Fig. 1. Ceratites Murchisonianus, De Kon., specimen seen in profile, half the 

 natural size. 



1 a. Transverse section of the same, reduced. 



2. Nautilus Flemingianus, De Kon., specimen seen in profile, half the 



natural size. 



2 a. Transverse section of the first two coils of the spire, reduced, and 



showing the place of the siphon. 



3. Nautilus Burtini, Graleotti, half the natural size, seen in profile. 



3 a. Back view of the same. 



3 b. Last septum of the same. 



4. Orthoceras decrescens, De Kon., natural size, seen in profile. 



4 a. Transverse section of the same. 



5. Acrodus Flemingianus, De Kon., natural size, seen in profile. 



6. Saurickthys? Indicus, De Kon., three times the natural size, seen in 



profile. 

 6 a. The same, front view. 



6 b. The same, upper side. 



7. Saurickthys? Indicus, var., De Kon., three times the natural size, seen in 



front. 



7 a. Transverse section of the same. 



2. On a Deposit containing Diatomace^, Leaves, Sfc, in the Iron- 

 ore Mines near Ulverston. By Miss E. Hodgson. 



[Communicated by the President.] 



(Abridged.) 



Contents. 



Introduction. 



Tarns. 



Cavernous Nature of the Ground. 



Swallow-holes. 



a. Lindale Moor. 



b. Poaka Beck. 

 Sections. 

 Diatomacea and Plants. 



Introduction. — In the ' Quarterly Journal of the Geological Society,' 

 vol. xviii. p. 274, &c, there is a paper by John Bolton, Esq., " On a 

 Deposit with Insects, Leaves, &c," met with in or near the Iron-ore 

 Mines of Lindale, in Low Furness, North Lancashire; which deposit, 

 for reasons stated in the paper, is presumed to be of great antiquity. 

 Before determining either the age of the deposit, or its origin, it 

 seems important that geologists should be made acquainted with some 

 circumstances connected with the district, which would rather induce 

 one to interpret it as being a cavern- deposit, carried down to these 

 depths by means of currents, — the currents passing through what 

 are called " Swallow-holes," — the cavernous and otherwise open 



c2 



