16 CARBONIFEROUS CEPHALOPODA OF IRELAND. 



county of Limerick. They are here for the first time figured, and it may be 

 mentioned that tbey are the specimens which passed through the hands of 

 de Koninck at the time that he was writing his well-known work on the 

 Carboniferous Limestone of Belgium (' Faune du Calc. Carb.,' &c). This species 

 is recorded by Sir Richard Griffith in his ' Localities of the Irish Carboniferous 

 Fossils,' arranged as an appendix to M'Coy's ' Synopsis ' (1862), from Shrule, 

 near Ballymahon, in the county of Londonderry. 



M'Coy's type specimen is in the Museum of Science and Art, Dublin, 

 (Geological Survey Collection). 



Localities. — St. Doulagh's, county of Dublin; Clane, county of Kildare ; 

 Ardlaman, county of Limerick ; Shrule, near Ballymahon, county of Londonderry. 



III. Group Angulata. 

 Orthoceras Wrightii, S. Haughton. Plate V, figs. 2 a — e. 



1859. Orthoceras Wrightii, S. Haughton. On some New Orthocerata from 



the Carboniferous Limestone of the Neighbour- 

 hood of Cork and Clonmel, Journ. Roy. Dublin 

 Society, vol. ii, 1858-9, p. 241, pi. v, fig. 2. 

 1896. — PtrzosiANUM ?, A. H. Foord. Ueber die Orthoceren des 



Kohlenkalks (Carboniferous Limestone) 

 von Irland. . . . Inaugural-Disserta- 

 tion zur Erlangung der Doktorwiirde 

 . . . der Kgl. bayer. Ludwig-Maxiini- 

 lians-Universitiit zu Miinchen, p. 26. (Not 

 of de Koninck.) 



Description. — Shell rather small, tapering at the rate of 1 : 9. Section very 

 slightly elliptic. Body-chamber incomplete ; its proportions cannot, therefore, be 

 given. Septa oblique, making an angle of about 15° with the transverse axis of 

 the shell, shallow ; the distance between them cannot be stated, as only the last 

 septum is visible, owing to the body-chamber having become separated from the 

 septate part of the shell. Siphuncle central. The ornamentation consists of 

 numerous (about twenty-four to twenty-seven) longitudinal ribs, strong enough 

 to mark the cast quite distinctly ; these are not equally spaced, varying from 1*5 

 to 2 mm. apart. Between these coarser ribs are four or five finer ones, and over 

 the whole surface of the test are seen innumerable fine and regular transverse 

 lines crossing the ribs and the spaces between them (PI. V, fig. 2 c). 



