Jurassic Moll Hsca from Araln'a. \1 



le same, so far as tliey can be compared with the Arabian 

 pecimen, although the measurements of the figure do not 

 Liite agree with the dimensions given by de Loriol (p. 16) * ; 

 pt its ornaments appear to be somewhat finer and fewer, 

 J LorioPs example having 47 priiicipal ribs in the outer 

 |iorl, whereas the Arabian fossil has only 42 or 43. 

 ' This specimen, then, seems to find its nearest ally in 

 'ieHsphinctes torquatus, which occurs in the Katrol Group 

 i Cutch in beds which are referred to by Siemiradzki f as 

 bwer Kimeridgian ; at Niti and Spiti in the Himalaya; 

 fd, according to Siemiradzki, also in the zone of Oppelia 

 'iuilobata in Poland, and probably also in Swabia. 

 *A crushed specimen, about 34 mm. in diameter, exposed 

 1 the surface o£ a small piece of limestone, appears to be 

 ferable to this same species. 



rioc. Valleys between tiie villages of Al-Kura and Samma, 

 -iDut 15 miles N.E. of Dihala. 



I Peiisphinctes c£. suhdvlus, Fontannes. 



f (PI. 11. fig. 3.) 



te79. Perisphinctes subdolus, F. Fontaunes, Description des Ammonites 

 I des calcaires du CluUeau de Crussol, Ardeche (Zones a Oppelia tenui- 

 l lohata et Waagenia beckeri), p. 61, pi. ix. fig. 3. 

 yB98, Perisphinctes subdolus, F. Fontannes ; J. v. Siemiradzki, Palason- 

 I tographica, Bd. xlv. Lief. 2 & 3, p. 153. 



Another species of the genus Perisphinctes, represented by 

 J crushed half of a specimen of about 83 mm. in diameter 

 d Vf'ith the inner whorls obscured by matrix, bears some 

 lemblance in the character of its ribbing to Perispjhinctes 

 ydolus, Fontannes, a rather common species in the zone of 

 vpelia tenuilohata of Crussol (Ardeche) ; but it appears to 

 ^■e been a more widely umbilicated shell with relatively 

 LTOwer [i. e. less high) whorls, for the diameter of its 

 Jjilicus at about its greatest diameter ( = 1) appears to be 



;Tbe measurements given by de Loriol are ; — greatest diameter 78 mm. ; 

 •th [height] of last whorl, in proportion to the diameter, 0"37 ; thick- 

 i of last whorl, in proportion to the diameter, 0'34 ; diameter [width] 

 iiibilicus, in proportion to the diameter, 0'37. From these dimensions 

 'ould appear that the width [height] of the last whorl and the diameter 

 he umbilicus were equal, but such is not the case in de Loriol's figure, 

 dimensions of the figure are :^ greatest diameter 79'o mm. (1); 

 |ht of last whorl 27 (0-34) ; thickness of last whorl 28 (0-35) ; width 

 inbilicus 33-0 (0-42). 



IJ. V. Siemiradzki, ' Palseontographica,' Band xlv. Lief. 4 & 5, 1898, 

 *4. A. de Lapparent divides the Katrol group into two parts, and 



!:d8 tbe Lower part as of Sequanian age and the Upper as of Ki me- 

 an age (' Traite de Geologic,' 5th ed. 190G, vol. ii. pp. 1243 &; 1250). 

 nn. cL- J/ay. xV. Hist. Ser. 8 Vol ii. 2 



