EXPLANATION OF PLATE 30. 51 



larger and superior Plate overlapping the edges of 

 the next subjacent and smaller plate. These edges 

 are rendered more irregular by decomposition. 



d'. Magnified representation of very minute curved lines 

 passing from the marginal band across the shaft, 

 at d. 



e. Thin lamina of the white pulverulent substance of a 

 decomposed Plate ; it retains partial traces of the 

 transverse wavy fibres. 



f. Minute perpendicular filaments prevailing over the 

 transverse fibres of the shaft. 



Fig. 3. Fossil Loligo from Lyme Regis, showing the 

 same structure as the preceding figures, in the seve- 

 ral portions of the Pen that are preserved ; and 

 having its Ink bag distended nearly in its natural 

 shape and place beneath the Pen. (Original.) 



C.C. Axis of the shaft. 



Figs. 4. 5. 6. 7. 8. 9. Fossil Ink bags from Lyme Regis. 

 The membranous sacs and excretory ducts are still 

 preserved, and closely resemble those of a recent Ink 

 bag ; see PI. 28. fig. 5. (Original.) 



Fig. 10. Fossil ink bag found by Miss Anning in the Lias 

 near Watchet, Somerset. (Original.) 



Plate 30. V. I. p. 234. 



A large fossil pen of Loligo; from the Lias at Lyme 



Regis. In the collection of Miss Philpot. (Mrs. 



Buckland. Original.) 

 AA. Barbs of the pen, proceeding from the outer edges 



of the marginal bands. 

 B.B. Marginal bands dividing the bases of the barbs from 



the internal part or body of the shaft. 

 C. Axis of the Pen, dividing the body of the shaft into 



two equal parts. 



