new or little-known Gouiatites /ro;n Ireland. 453 



Brancoceras ornatissiinuin, L. G. de Koniaek, sp. 



Goniatifes ornattssimns, L. G. de Koninck, " Sur quelques C<5phalo- 

 podes nouveaux du Calcaire oarbonifere de I'lrlande," Ann. Soc. g6ol. 

 de Belg. vol. ix., Mdmoires, p. 53, pi. vi. figs. 4 & 5 (erroneously 

 stated to be pi. v. figs. 4 & 5; (1881). 



Sp. char. Shell soniewliat ovoidal, compres.secl, with closed 

 umbilicus ; greatest thickness at about one fourth of the 

 height of the whorl from the umbilicus, about seven tenths of 

 the diameter of the shell ; height of outer whorl about three 

 fifths of the diameter of the shell. Whorls (? number); in- 

 clusion complete ; umbilicus closed with shelly callus, in 

 centre of infundibuliform depression. Whorl oval or sub- 

 cordate in cross-section, rather wider than high ; indented to 

 about one half of its height by the preceding whorl ; peri- 

 phery narrowly convex, imperfectly defined ; sides feebly 

 convex, convergent, their inner portion sloping towards the 

 umbilicus and forming an obtuse angle with the rest of the 

 side; no distinct umbilical zone. Body-chamber probably 

 occupying fully half a whorl ; aperture not seen, but (judging 

 by the ornaments) the peristome probably with a broad 

 lateral crest and a deep and fairly wide hyponomic sinus. 

 Chambers (? depth) ; suture-line only imperfectly seen ; ex- 

 ternal lobe narrow, with a single point, external saddle 

 rounded, fairly wide ; lateral lobe with a single point, some- 

 what wider than the external lobe; lateral saddle very bx'oad, 

 rounded, twice as wide as the external saddle. Test with 

 tine regular raised lines, which cross the lateral area of the 

 whorl in a bold orad-convex curve, and form on the periphery 

 a deep and fairly wide hyponomic sinus. 



Dimensions. 



Diameter of shell fi8 mm. (100) 



"Width of umbilicus (closed) 



Height of outer whorl 41-5 mm. (61-0) 



Ditto above preceding whorl 23 „ (33-8) 



Thickness of outer whorl 47 ,, (69"1) 



The dimensions given by De Koninck are: — longitudinal 

 diameter 70 millim.; transverse diameter 42 miliim.; height 

 of aperture 40 millim. 



liemarks. I have seen only one example of this species, 

 that is the type specimen which forms part of the collection 

 of the Geological Survey of Ireland ; it bears the locality 

 " Limerick, Glenbane E. " j but De Koninck says it came 



