258 



THE LIAS AMMONITES. 



Acanthoceras Brottianum, d'Orh. 



— Deverianum, d'Orh. 



— maramillare, Schl. 



— Martinii, d'Orh. 



Acanthoceras Mantelli, Sow. 



— Rhotomagense, Brong. 



— Sussexiense, Sharp. 



— Woolgarei, Mant. 



All these species have been separated from Hoplites, and some of them have appeared 

 Tinder that generic name in the earlier part of this Monograph. They are, however, now- 

 placed as indicated by Neumayr in his latest work on this subject. 



Fig. 175. 

 Acanth. Deverianum, d'Orb. 



Fig. 176. 

 Acanth. Martinii, d'Orb. 



Genus Stoliczkaia, Neum., has been erected to receive a small group of remarkable 

 Ammonites figured and described by Dr. Ferd. Stoliczka^ in his great work on the 

 Ammonitidse from the Chalk of Southern India, some of which were compared 

 with Arcestes from Hallstatt. Stoliczkaia Telinga, Stol., in its external form, certainly 

 resembles some of the gigantic Arcestes from the Alpine Triassic strata of Hallstatt in the 

 form and smoothness of the shell, and in the constriction of the mouth-border ; but in the 

 shortness of the body-chamber, and the structure of the suture-line, it has not the 

 most remote resemblance to the Triassic forms from the Austrian Alps, with their very 

 characteristic suture-line, and their long body-chamber of one whorl and a half in length. 



The shell is massive, highly involuted, sometimes discoidal, and then with a wider 

 umbilicus. Body-chamber about three fourths of a whorl in length. Mouth-border undu- 

 lated, produced in the middle of the lateral wall, and slightly excised towards the siphonal 

 or ventral area. The inner whorls provided with radii, which are not interrupted on the 

 ventral area ; the ribs attain here their greatest development ; the body-chamber has a 

 smooth shell ; in some species it has thickened ribs ; the ventral side has neither a keel nor 

 channels. The lobe-line is much ramified, consisting of a siphonal lobe and a principal 

 and lower lateral on each side, with a more or less developed columellar lobe having 

 pendant digitations. 



I refer the reader to Dr. Ferd. Stoliczka's magnificent volume on the Ammonitidse 

 from the Cretaceous formations of Southern India for remarkable types of this genus, 



such as : 



^ ' Palseontologia Indica,' " Aramontidse of the Cretaceous Formation." 



