. College collection of palaeontology. 104 MOLLUSCA. No. 324. Ammonites , Brong. This is the the type of the group "Rothoinagenses," the members of which are characterized by having a series of tubercles along the dorsal line in place of a keel, They belong chiefly to the Cretaceous period. From the Lower Challf, Dover, England. No. 325. [530, Cast]. Ammonites Rothomagensis, Brong. An internal cast of part of one whorl, showing the foliations. From the same locality, and now in the Ward Collection, University of Rochester. Diameter, 7. No. 226. Ammonites semisulcatus, d
. College collection of palaeontology. 104 MOLLUSCA. No. 324. Ammonites , Brong. This is the the type of the group "Rothoinagenses," the members of which are characterized by having a series of tubercles along the dorsal line in place of a keel, They belong chiefly to the Cretaceous period. From the Lower Challf, Dover, England. No. 325. [530, Cast]. Ammonites Rothomagensis, Brong. An internal cast of part of one whorl, showing the foliations. From the same locality, and now in the Ward Collection, University of Rochester. Diameter, 7. No. 226. Ammonites semisulcatus, d'Orb. From the Cretaceous, Drome, France. No. 227. [531, Cast]. Ammonites serpentinus, Schloth. This is the type of the group ''Faldferi," which have a compressed shell with sharp keel. The folds of the shell are numerous, and usually bend with an abrupt curve in the middle of their course. From the Upper Lias, Charmouth, England. Diameter, 7. No. 228. Ammonites splendens, Sow. This variable Ammonite, is a characteristic fossil of the Gault (Cretaceous), Folkestone, England. No. 229. [1303, Cast]. Ammonites tornatUS, Brown. This Ammonite belongs to the group " globosi," characterized by being very closely coiled, umbilicus quite small or wanting, surface smooth or feebly striated, and devoid of ribs and tubercles. It is from the Trias at Hallstadt, Austria, and is now in the Ward Collection, LTuiversity of Rochester. No. 230. Ammonites Woollgari, Mant. This species is one of the most marked forms in the group "Rotho- ; It has much resemblance to A. Boihomagensis, particularly in the young stage; but differs from it by having less closely coiled whorls, and the ribs fewer, more salient, and more angular on either side of the dorsal plane. From the Creta- ceous of Smith's Branch, Texas. No. 231. Ammonites. Polished Section, showing the septa. From the English Please note that these images are extracted from scanned page images that may hav
Size: 1583px × 1578px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1900, bookyear1901
