A manual of the Mollusca, or, A rudimentary treatise of recent and fossil shells . ^^r^^ty^ Fig. 56. Ammo?)ites coronatus.*E. Back round, convex. 11. Heterophi/lli, L. ool. 12. Ligati, cret. 13. Annulati, ool. 14. Coronati, ool. 15. Fimbriati, ool. A. heterophyUus (fig. 34).A. planulatus (pi. III., fig. 3).A. annulatus, biplex, coronatus (fig. 56), sublae\ fimbriatus, lineatus, hu-cinus. Fig. 56. Profile of ammonites coronatus, Brug. (reduced ^ from DOrbigny)Kelloway rock, France, d I, dorsal lobe ; ss, dorsal saddles ; I V. lateral lobes ; **.lateral saddles; accessory and v
A manual of the Mollusca, or, A rudimentary treatise of recent and fossil shells . ^^r^^ty^ Fig. 56. Ammo?)ites coronatus.*E. Back round, convex. 11. Heterophi/lli, L. ool. 12. Ligati, cret. 13. Annulati, ool. 14. Coronati, ool. 15. Fimbriati, ool. A. heterophyUus (fig. 34).A. planulatus (pi. III., fig. 3).A. annulatus, biplex, coronatus (fig. 56), sublae\ fimbriatus, lineatus, hu-cinus. Fig. 56. Profile of ammonites coronatus, Brug. (reduced ^ from DOrbigny)Kelloway rock, France, d I, dorsal lobe ; ss, dorsal saddles ; I V. lateral lobes ; **.lateral saddles; accessory and ventral lobes. The number of accessory lobes increases?with age. CEPHALOPODA. 95 16. Cassiani, 36 sp. of very variable form, and remarkable for the numberand complexity of their lobes. Trias, Austrian w% I A Fig. 57.* Ex., A. MaximiKani (fig. 57), A. Metternicliii. Ckioceras, )i., krios, a ram, and ceras, a , tropEeiim, Sby. Ex., C. cristatum, DOrb. (pi. III., fig. 8).Shell, discoidal; whirls , 9 sp. Neocomian—Gault; Brit., France. ToxocEKAS, , toxon, a bow, ceras, a , T. annulare, DOrb. (pi. III., fig. 12.)Shell, bow-shaped ; like an ammonite uncoiled. Distr., 19 sp. Neocomian. Between this and crioceras and ancylocerasthere are numerous intermediate forms. Ancylocekas, , anculos, , A. spinigerum (pi. III., fig. 10). Shell, at fiist discoidal, with separate whirls; afterwards produced at atangent and bent back again, like a hook or crosier. • Distr., 38 sp. Inf. oolite—chalk. S. America (Chile and Bogota), , , scaphe, a , S. equaUs (pi. III., fig. 9). Shell, at iiist discoidal, \\\i}i close whirls; last chamber dctac^hed andrecurved. Distr., 17 sp. Neocomia
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmollusks, bookyear185
