170 CARBOXIFEROUS CEPHALOPODA OF IRELAXD. 



Localities. — Clonmel, county of Tipperary (from Mr. Joseph AVright's 

 collection); Ballynacarriga (Xos. 301, 778, and 1519 of the Geol. Surv. Coll.), 

 Xantenan (Xos. '250 anil 4712), anil Fanningtown (Xo. 1141), county of Linierick. 



Gi.YPiiiocEijAS (BEYinciiocERAs) ocrinEXTAi,!':, sp. uov. Plate XLV, figs. 5 n, ]>, 



G a, h. 



Description. — Shell of medium size, discoid, somewhat compressed, close-coiled, 

 the greatest thickness at about one-third of the height of the whorl from the 

 umbilicus, about one-half of the diameter of the shell ; height of the outer whorl 

 about five-sixths of the diameter of the shell. Inclusion of the whorls nearly 

 complete ; umbilicus small. ^ATiorl semi-elliptical in cross-section, about one-fourth 

 higher than wide, indented to nearly half its height by the preceding whorl. 

 Periphery rounded. Umbilical zone indistinct, merging with a very slight 

 convexity in the sides of the shell. Body-chamber occupying at least one entire 

 whorl ; aperture, as indicated by the lines of growth, with a shallow hyponomic 

 sinus upon the periphery and a somewhat prominent crest upon the upper third 

 of the lateral margin. One or two shallow constrictions occur, marked only upon 

 the cast. Chambers somewhat deep as seen in the rather widely spaced suture- 

 lines (PL XLV, fig. 5 c), the peripheral lobe large as compared with the lateral lobe. 

 Test almost smooth, the lines of growth pursuing the direction taken by the outline 

 of the aperture just described. 



IMmensious. 



Spociinens from Keriy in the Museum of Science and Art, 

 Dublin (Geological Survey Collection). 

 (No. 41(;!).) ' (No. 3786.) 



Diameter of shell . . 55 mm. . . 43'0 ram. 



,, umbilicus . 9 ,, . . 5"0 „ 



Height of outer Avhorl . 30 ,, . . 21'5 „ 



,, above jDreceding whorl . 15 „ . . 9'0 „ 



Thickness at umbilical margin . 28 „ . . 19"0 „ 



Affinities. — This species reseml)les G. (B.) roteJlo, de Kon.,^ in many 

 particvdars, and I should have hesitated to separate them but for the much larger 

 umbilicus of the latter. The sutures are remarkabl}' similar to each other in form 

 in the two species, though de Koninck gives no information as to their distance 



' FauneCalc. Carb. Bclgiquc (Ann. Mus. Eoy. d'Hist. Nat. Belgiqiic, si'r. Pak'ont., torn, v), pt. 2, 

 p. 100, pi. xlix, figs. 14, 14 o. 



