53 
KX1'1.AN ATION OF PLATE 31. 
tile siph uncle is laid bare at a. L c. d. At e, e, and 
oiu thence inwards, it is covered by a soft calca- 
reous coating or sheath. 
•V- y- Collar, projecting inwards from the transverse 
P ates, and supporting the Siphuncle. See Note, 
p. ^•I-p.322. 
‘g- 2. Upper horny mandible of the animal, with a hard 
^ calcareous point. (Owen.) 
g- 3. Lower horny mandible, armed with a similar 
p. calcareous point. (Owen.) 
g 4. Calcaieous point, and palate of upper mandible 
separated from the horny portion. (Owen.) 
^ 5" surface, or palate of a Rhyncholite, or 
ossil beak, from the Lias at Lyme Regis, analogous 
to the recent specimen, fig. 4. (Original.) 
Fig. 6. Upper view of another Rhyncholite from the same 
stratum and place. Black portions of the horny 
substance, in a state resembling charcoal, remain 
^ attached to its posterior surfaces. (Original.) 
‘g. Side view of the calcareous portion of an upper 
mandible, from the Muschel kalk of Luneville. 
(Original.) 
*g- 8. Upper view of another Rhyncholite from Lune- 
p. ''iPc. (Original.) 
S- lU. Calcareous point of an under mandible from 
uneville. The dentations on its margin resemble 
ose on the recent mandible, fig. 3, and co-opera- 
with the dentations on the Margin of the upper 
®g’ ^7 must have formed an Instrument 
(Fke the recent beak, figs. 2 and 3,) well fitted for 
c rapid demolition of Crustacea and small Shells 
p. (Original.) 
S- 11. Under surface of fig. 10.; it is strengthened by 
