198 
Professor Neumayr* distinguishes from the Dogger and 
Malm four groups in this genus, of which the following are 
types:—I. Phyll. heterophyllum, Sow.; IL. Phyll. tatricwm, Puscu; 
III. Phyll. Capitanei, Carutto; IV. Phyll. ultramontanwm, Zrrr. 
This genus commences in the Trias Phyll. debile, Haver; and 
Phyll. Neojurense, Quunst. Phyll. despectum, Moss.; Phyll. 
occultum, Moss. In the Middle Lias, Phyll. Loscombi, Sow.; 
Phyll. Zetes, D’Orz. In the Upper Lias, Phyll. heterophyllum, 
Sow.; Phyll. subcarinatum, Youne. In thé Oxford Phyll. tatri- 
cum, Puscu.; Phyll. viator, p’Ors.; Phyll. Hommairei, v’OrRB.; 
Phyll. Zignoanum, v’Orz. In the Cretaceous rocks, Phyll. 
- Vellede, v’Ors., and several other immature shells. In the 
Jurassic rocks of Kutch, Western India, Dr. W. Waacen has 
figured and described} several interesting species, closely allied 
to European forms, collected by the Geological Survey of India 
from the Upper Jurassic formations. 
IV Family Ancocrratipm, Newmayr. 
This family includes a considerable number of Ammonite 
groups, which have widely different forms and affinities, so that 
it is almost impossible to give a general description of the 
family which shall be correct and comprehensive at the same 
time. , 
The lobes present a great variety of ramified figures; the 
suture-line is in general complicated ; the siphonal lobe large, 
and the principal lateral and secondary laterals attain consider- 
able dimensions. 
The siphonal or ventral area is in general round and well 
developed ; in some there is a keel with lateral channels more 
or less deeply grooved; in others the shell is flattened and 
discoidal, with a wide open umbilicus; or is round and inflated, 
with highly involute whorls and a small umbilicus, sometimes 
* Neumayr, “ Phylloceratten des Dogger und Malm,” “ Jahrbuch der Geol. 
Reichsanstalt,” 1871, bd. xxi. 
+ “ Palsontologia Indica, pls. v, vi, vii, p. 25. 
