(IT.VrTTTOr'KT^AS (BEYRTrTTOrERAS) MTCT^OXOTT'M. 177 



Dimensions. 



Specimens in the Musouni of Scionr-e and Art, Dulilin. 

 Adult speciiiion (typi"). Younj^ si«'ciiiii'n. 



Diameter of sliell . . . 95 mm. . GO'U mm. 



„ uiiihiliciis (edge to edge) . 25 „ . 20'0 „ 



,, ., (sutiij-c to . 'future) 22 „ . ]5*5 ,, 



Height of outer wliorl . - 45 „ . 27-0 „ 



,, a])ove preceding wliorl . 25 ,, . 18"0 „ 



Thickness at nmhilical margin (aliout) . 58 „ . 40"5 „ 



Affiniti'-!^. — In his description of this species Mr. Crick has not ventured to 

 suggest any comparison of it with others, and it is in fact difficult to institute 

 any satisfactory one, so distinct does its principal feature prove to be, that is, the 

 extremely globose form of its whorls. In considering its affinities in a more 

 comprehensive sense the character of the suture-line indicates these to be with 

 Beyrichocevds rather than Munsteroceras. The suture-line of (1. (//.) irnncatum 

 (PI. XLIV, fig. 2c, and PL XLIX, fig. 14), e.g., is not unlike that of the present 

 species, and there is another feature in which these species reseml)le each other, 

 and that is in the possession of broad and very shallow constrictions' at irregular 

 intervals on the surface of the cast. 



Uemarl-K. — Only three specimens of this species are known to me, the two 

 figured on Pis. XLVII and XLVIII, from which Mr. Crick drew up his descrip- 

 tion of the species, and another smaller one which passed through my hands ; all 

 are from the same place. 



Londify. — St. Doulagh's, county of Dublin. 



Glvphiocekas (BEYUK'iioCEitAs) .MiORONGTrM, J. riiillips, sp. Plate XLIV, figs. 5 <i, h. 



183G. GoNiATiTES MicRONOTDS, J. Phillips. Gcology of Yorksliirp, pt. 2, p. 234, 



pi. xix, figs. 22, 23. 



1843. — — J. MorriK. Cat. Brit. Foss., p. 180. 



1844. — — F. M'Coy. Synops. Garb. Fos.s. Irelaml, p. 14. 

 1848. — — J. H. Cummimj. Isle of Mau, p. 357. 



— — — H. G. Bronn. Gcsch. iler Natur, vol. iii, p. 543. 



1850. AoANiDES MiCKONOTUs, A. iVOrhiijiiy. Prod, tie Pak'ont. straiigr., vol. i, 



p. 115. 

 1852. Ammonites miceonotus, C. G. Giehel. Fauna der Vonvelt, vol. iii, p. 474. 



1 Two of these are seen dose together on the specimen figured on PI. XLVII, fig. 1 a. at the 

 upper part of the latter. 



