14 CARBONIFEROUS CEPHALOPODA OF IRELAND. 



chamber imknown. Septa somewhat oblique, deeply concave, somewhat widely 

 separated from one another— that is, 8 mm. apart where the diameter of the shell 

 amounts to 30 mm., 3-5 mm. from each other towards the apical extremity, where 

 the shell measnres 15 mm. in diameter. The distance between these two measure- 

 ments is 75 mm. Test quite smooth. 



Affinities.— This species differs from C))-///(ife)-(7.s ///»(/t>( and from 0. onhchiratim 

 by the horizontality of its septa, and it is also distinguished from the former by 

 its smaller siphuncle. Its septa are much wider apart than those of 0. siihchn\ituv) . 

 These ditterences seemed to justify the distinctness of the present species, of 

 which only one has up to the present time been recognised. 



Localitif. — Little Island, near Cork. 



II. Group Anndlata. 



OiirHocKEAS L.i:viGATUM, F. M'Coij. Plate V, figs. 1 a — e. 



lSi3. OnxnocEUAS axxvlatim, L. G. de Koninck. Precis cKmu. de Geologic, 



par J. J. d'Omalius, p. 515. (Not ofSowcrby.) 

 ISl'J— 4. — B.vCTYLiorHORUM, L. G. de Koninck. Descrip. Auim. Foss. 



Belgiquc, p. 318, pi. slvii. Kg. 2; pi. 

 slviii, tigs. 7 a, b. 

 lSJt4. CrcLOCERAS LJVioATUM, F. Jil'Coy. Syuopsis of the Char, of tlie Curb. 



Liinest. Foss. of Ireland, p. 10, pi. i, fig. 3. 

 1S50. Obtuocekas dactvliophokum,.j(. rf'0»-ijy«y. Prodr. de paleont. stratigr., 



vol. i, p. 113. 

 ISol. — — CO. Giehel. Fauna der Yorwelt, Bd. iii, 



Abth. 1, p. 255. 

 ISGO. Cyclocebas l.>:vioatum, i?. Griffith. Jouru. of the Geol. Soc. of Dublin, 



vol. is, p. 55. 

 ISSO. OuTHOCEEAS LJEYiOATUM, L. G. de Koniiick. Faune Cale. Carb. Belgique 



(Aun. Mus. Koy. d'Hist. Nat. Belgique, scr. 

 Paleont., vol. v), pt. 2, p. 70, pi. sli, fig. 4. 

 ? ISSO. CxBTOCEnAS DACTTUOPUORiM, L. 6. de Koninck. Ibid., p. 30, pi. .\sxiv, 



fig. 1. 

 ISOO. Ortuocekas L^YiOATrM, A. H. Foard, feber die Ortboceren des Kohlen- 



kalks (Carboniferous Limestone) von Irland. 

 . . . Inaugural-Dissertation zurErlangung 

 der Doktorwiirde . . . der Kgl. bayer. 

 Ludwig-Maximilians-Universitiit zu Miiucheii. 

 p. 25. 



Description.— ShcW straight, or slightly curved in the apical region; tapering 

 very slowly, viz. at the rate of 1 : 2(.>. Section circular. Body-chamber 



