ORTHOCERAS KILDARENSE. 17 



Size. — Length of the Clonmel example 103 mm. ; greatest diameter 19 mm., 

 least 6 mm. 



Affinities. — This species in its ornamentation roughly resembles Cyrtoceras 

 Puzosianum, de Koninck, 1 but it is more elaborate in character in this respect. 

 Thus in de Koninck's species the fine and multitudinous transverse lines are 

 wanting, and there is only one longitudinal ridge between two of the larger ones, 

 — in short, the sculpture is much more simple. De Koninck's species, it may be 

 added, is distinctly curved, hence its assignment to Cyrtoceras by its author, for 

 which, however, there appears to be no warrant in the internal structure of the 

 shell. 



Remarks. — For a long time Ortlioceras Wrightii was represented, so far as I 

 am aware, by one specimen only. I have since found an example of it at Clane, 

 which is here figured for comparison with the type specimen. The Clane 

 specimen is not so well preserved as the one from Clonmel, but it nevertheless 

 shows in places all the details of ornamentation which characterise the species. 

 I am indebted to the kindness of my friend Mr. Joseph Wright, F.G.S., of 

 Belfast, for the loan of the type specimen described by Dr. Haughton. 



Localities. — Clonmel, county of Tipperary; Clane, county of Kildare. 



IV. Group Line ata. 

 Orthoceeas Kildaeense, A. H. Foorcl. Plate VI, figs. 3 a — d. 



1S96. Orthoceeas Kildaeense, A. H. Foorcl. Ueber die Orthoceren des 



Kohlenkalks (Carboniferous Limestone) 

 von Irland. . . . Inaugural-Disserta- 

 tion zur ErlangUDg der Doktorvviirde . 



der Kgl. bayer. Ludwig-Maximilians- 

 Universitat zu Miinchen, p. 26. 



Description. — Shell small, straight, tapering at the rate of 1:6. Section 

 circular. Body-chamber about one-third of the length of the whole shell. Septa 

 horizontal, distant, being about 7 mm. apart where the diameter of the shell is 

 15 mm. ; varying in distance from 6 mm. to 8 mm. in a length of 32 mm. 

 Siphuncle central, cylindrical. Test covered with exceedingly fine, acute, regular, 

 transverse, thread-like lines, of which eight or nine are contained in the space of 

 1 mm. ; they are therefore scarcely visible without a lens. 



Affinities. — This distinct and beautiful species seems to be very rare. I 

 obtained only one example of it, which is now in the Museum of Science and Art, 



1 ' Calc. Carb. Belg.,' pt. 2, p. 34, pi. xxxiii, figs. 10, 11. 



3 



