24 CARBONIFEROUS CEPHALOPODA OF IRELAND. 



and constitute the main and obvious feature in the relationship of the two 

 forms. 



Bemads. — The occurrence in the Clane quarries of several examples of thi.s 

 beautiful form, all stamped with its characteristic features, impart the requisite 

 stability to it as a species. Two of the best specimens ai'e figured, the test being 

 exquisitely preserved in the one represented by fig. la ; in the other (fig. 1 e) 

 the surface is considerably eroded, though tlie strength of the markings has pre- 

 served them here and there from complete destruction, and thus the identity of the 

 species has not been lost. I regret that the apical end is not present in any of the 

 specimens before me. Most of the fossils Avhich come into the hands of the palae- 

 ontologist liave already suffered from the effects of the sledge-hammer of the quarry- 

 man, whose untrained eyes allow these valuable pieces to remain embedded in 

 the rock, and thus many a precious fragment is thrown aside or shot into the fiery 

 depths of the lime-kiln ! The species is named after Professor TV. J. Sollas, F.R.S., 

 of Oxford. 



Localifi/. — Clane, county of Kildare. 



ORTnocKRAS MULTiSTRTATUM, A. H. Foovd. Plate VIII, figs. 2 a, h. 



Oethoceeas MiLTisTBiiTrM, A. M. Foord. Ueber die Orthoceren des Kohlen- 

 kalks (Carboniferous Limestone) von Irland. 

 . . . Inaugural-Dissertation zur Erlangung 

 der Doktorwiirde . der Kgl. bayer. 



Ludwig-Maximilians-Universitat zu Miinchen, 

 p. 31. 



Description. — Shell straight, elongate, tapering at the rate of 1 : 10, measured 

 along the larger diameter. Section somewhat elliptical, whether naturally so or 

 by rock-pressure it is diflBcult to determine ; the ratio of the two diameters is as 

 38 : 30. Body-chamber imperfect, so that its size in relation to the complete shell 

 cannot be computed. Septa oblique, 8 mm. apart where the diameter of the 

 shell stands at about '2(J mm. ; necks of the septa short and hooked. Siphuncle 

 cylindrical and rather wide (PI. VIII, fig. 2 h). Test ornamented with fine, 

 irregularly spaced, imbricating stria?, the edges of which are directed upwards ; 

 about two of the striie fill the space of 1 mm., they are therefore visible to the 

 naked eye (PI. VIII, fig. 2 a). 



Size. — The length of the most complete specimen known to me is about 

 195 mm., the greatest diameter 40 mm., the least 18 mm. 



Affinities. — The ornamentation of this species naturally suggests affinities with 

 0. pereUipticum, but the general form is quite different, the rate of tapering being 

 very low in the present species and very high in 0. pereUipticiim. While thus 



