452 Mr. G. C. Crick on some 



have a nearly radial direction on the lateral area and form a 

 fairly wide and moderately deep hyponomic sinus on the 

 periphery ; the body-chamber with obscure backwardly 

 curved riblets extending from the edge of the umbilicus over 

 about one third of the lateral area ; the internal cast has on 

 the first fourth of the outer whorl two constrictions, which 

 arise at a short distance from the edge of the umbilicus and 

 cross the whorl parallel to the growth-lines. 





D 



imensions. 



Piameter of shell 90 mm. (100) 



"Width of umbilicus (at suture of shell) 24 „ (26'0) 



^Vidth of umbilicus (at its margin) 27 „ (300) 



Height of outer whorl 40-6 „ (45-0) 



Ditto above precedin-r whorl 28 „ (31-1) 



Thickness of outer whorl 295 „ (32-8) 



Remarks, I have seen only one example of this species ; 

 it is in the collection of the Geological Survey of Ireland, 

 and I am greatly indebted to the authorities of the Survey 

 for the loan of the specimen. It is there labelled " Goniatites 

 Leesoni^'' but, so far as I know, no description of the species 

 has been published under this name. Unfortunately the 

 suture-line cannot be made out ; but there is every reason to 

 believe that the species belongs to the genus Frohcanites. 



Affinities and Differences. The present species can be 

 readily distinguished from both Prolecanites compressuSj 

 J. Sowerby, sp.*, and Prolec. similis, Crick f, by the small- 

 ness of its umbilicus. 



Horizon and Locality. Carboniferous Limestone : Glen- 

 bane East, Limerick, Inland. This is the same locality as 

 that which yielded the type specimen of L. G. de Kouinck's 

 Goniatites ornatissimus \. 



* J. Sowerby, Min, Conch, vol. i. p. 84, pi. xxxviii., 1813 (ElUpsoUtes 

 compressus). See also Foord & Crick, " Ou the Identity of Ellipsolites 

 compressus, J. Sowerby, with Ammonites Hetisloict, J. Sowerby," Geol. 

 Mag. dec. iv. vol. i. (1894), p. 11, pi. i. 



t G. C. Crick, Trans. Manchester Geol. Soc. vol. xxiii. pt. iii. 1895, 

 pp. 80-84, woodcut. 



\ L. G. do Koninck, " Sur quelques C^phalopodes uouveaux du Cal- 

 caire carbonifere de I'lrlande," Ann. Soc. g(5ol. de Belg. vol. ix., Memoires, 

 p. 55, pi. vi. figs. 3 & 4 (erroneously stated to be pi. v. ligs. 3 & 4). See 

 also infra, p. 453. 



