TAB. III. 



[/« every case right-hand Scuta and Terga are figured ; hence the occlu ent margins are always to the left-hand.^ 



Fig. 1. Pollicipes concinnus; copied from the Mineral Concliology, PI. 647. 



(a) Group of specimens as found adhering to (b) Capitulura enlarged. 



an Ammonite, of the natural size. (c) Scales of the peduncle magnified. 



Fig. 2. Pollicipes ooliticus. 



(«) Carina. 



(b) Rostrum. 



Fig. 3. Pollicipes Hausmanni. 



(a) Carina. 

 (6) Scutum. 



(c) Tergum. 

 (</) Scutum. 



(c) Scutum, inside view of. 

 (rf) Tergum. 



Fig. 4. Pollicipes politus. 



Fig. 



(a) Scutum. (6) Small portion of the occludent margin, 



much magnified, to show the narrow prominent ledge. 



5. Pollicipes elongatus. 



(a) Tergum, about half natural size. (c) Scutum, natural size. 



{b) Scutum, much magnified ; the impression on the chalk gives the general outline. 



Fig. 6. Pollicipes acuminatus. 



(a) Scutum, outside view, figure restored. 



Fig. 7. Pollicipes Aiigelini. 



(a) Scutum. 



{b) Ditto, inside view of. 



(c) Tergum. 



Fig. 8. Pollicipes reflexiis. 



(«) Carina, dorsal view. 

 (6) Ditto, lateral view. 



(c) Ditto, section beneath the middle. 



(d) Tergum. 



Fig. 9. Pollicipes carinatus. 



(ff) Tergum. 



{b) Ditto, internal view. 



(c) Carina. 



{d) Scutum. 



(e) Scutum, inside view of. 



Fig. 10. Pollicipes glaber. 



(a) Tergum, broken carina, upper latus, and 



a latus of the lower whorl ; all these 

 valves belonged to the same individual, 

 and show their relative natural sizes. 

 {b) Scutum, natural size, of another indi- 

 vidual. 



(c) Ditto, ditto, four times magnified. 



(d) Ditto, inside view of upper part ; the left- 



hand is the occludent margin. 



Fig. 11. Pollicipes Nilssonii. 



(ff) Scutum, from a small worn specimen. 



(b) Carina, natural size, lateral view of. 



(c) Ditto, section of, across the middle. 



(6) Inside view of actual specimen. 



(d) Section across the middle of the tergum, to 

 show form of surface. 



(e) Scutum ; the letter (e) stands close to the occlu- 

 dent margin. 

 (/) Upper latus. 



{/) Carina, section of, near apex. 

 (ff) Rostrum, inside view. 

 (Ji) Ditto, lateral view. 

 (?) Ditto, dorsal view. 



(e) Tergum, four times magnified. 



(/) Carina. 



(</) Ditto, small portion of lateral margin, close 



above the basal margin, much enlarged. 

 (Ji) Rostrum, natural size. 

 {i) Ditto, four times magnified. 

 {k) Upper latus, three times magnified. 

 (/) Latus (probably from near the rostrum) of the 



lower whorl, three times magnified. 



{d) Sub-carina, inside view, natural size, 

 (e) Rostrum, inside view, natural size. 



