10 JURASSIC FAUNA. 



correctly, the siphtinole is closer to the ventral side in Nautilus, inflatus, while it is 

 nearer the dorsal side in Nautilm intumescem. 



2. Sub-class: AMMONOIDEA. 



Order: AMONNITIDM 



Sub-order: ANGUSTISELLATI, Branco. 



Division : Lanceolatiformes. 



Family : MGOCERATIDM, Steinm. 

 Part I : Carinati, Steinm. 

 1. Sub-family: HARPOCERATIN.E, Steinm. 

 Harpooeras, sp. Plate VI, fig. 1. 



The assumption of the occurrence of this genus in the limestones of Mazar 

 Drik is based on the discovery of a medium-sized fragment, which I think 

 exhibits a suflB.cient number of characters to permit of generic determination. The 

 shell consisted of very high whorls, laterally much compressed and with a sbarp 

 siphonal side. The umbilicus is very narrow. The sides are covered with low, 

 rounded, S-shaped ribs which divide sometimes into two, sometimes into three 

 branches. 



JJocality and stratigrapMeal position. — Mazdr Drik'; FolyphemusAimB^ionQ. 



J^emarks.- — There is no species, among those from Kutch, with which the above 

 specimen could be compared. It differs from all of them by its strongly compressed 

 whorls, and its rather faint ribs. As it is, however, too badly preserved, I refrain 

 from identifying it with any European species, trusting that future researches may 

 perhaps bring more material from which a definite conclusion might be drawn. 



Part II : Annulati, Steinm. 

 1. Sub-family: STEPHANOCERATINJE, Steinm. 

 1. Genus: SPH^ROOEUAS, Bayle. 

 Sph^eocbras bullatum, d'Orbigny. PI. VI, fig. 2-2a. 



1845. AmmonUei hullatus, d'Orbigny, Pal. Franjaise Terr. Jur., p. 412, pi. 142, figa. 1 and 2. 

 (J&on Stephanoeeras bullatum, Wsageu, Palseontologia Indica, Jurassic Eauna of Eutoh, Vol. I, p. 129 > 

 pi. XXXII, fig. 1 a, b.) 



Dimensions. 

 Diameter of the shell 152 nim. 



„ of the umbilious at the end of the body-chamber . 



„ „ „ „ beginning of the bgdy-chamber 



Height of the last whorl at the end of the body-chamber . i 



„ „ „ ), beginning of the body-chamber . 



Thickness of the last whorl at the end of the body-chamber 



„ „ >, „ beginning of- the body-obamber 



37 „ 

 13 „ 

 43 „ 

 61(P)„ 

 60 „ 

 88 „ 



