94 



MANUAL OF THE MOLLUSCA. 



Syn.y orbulites Lam. planiiJites, ]\Iontf. 



Shell, discoidal ; inner wliirls more or less concealed ; septa undulated ; 

 sutures lobed and foliated ; siphimcle dorsal. 



Bisir., 530 sp. Trias— chalk. Coast of Chili (D'Orb.) Santa Fe de 

 Bogota (Hopkins), New Jersey, Em*ope, and S. India. 



Capt. Alexander Gerard discovered ammonites similar to ouj L. oolitic 

 species, in the high passes of the Himalaya, 16,200 feet above the sea. 

 Section A. Back, with an entire heel. 



I 



i 



Fig. 56. Ammonites coronatus.* 

 F. Back round, convex. 



11. Heterophylli, L. ool. A. heterophyUus (fig. 34). 



12. Ligati, cret. A. planulatus (pi. III., fig. 3). 

 18. Annulatiy ool, A. amiulatus, biplex, giganteus. •■j 



14. Coronaii, ool, A. coronatus (fig. 56), 3ubla^^•is, 



15. Fimbriati, ool. A. fimbriatus, lineatus, hircinus. I 



• Fig. 5(5, Profile of ammonites coronatus, Brug. (reduced ^ from D'Orbigny) i 

 Kelloway rock, France, d Z, dorsal lobe ; *■ s, dorsal saddles ; I' I' laterallobes ; *'»'. ] 

 lateral saddles; accessory and ventral lobes. The number of accessory lobes increases , 

 with age. ' 'V 



