208 CABBONIFEROUS CEPHALOPODA OF IRELAND. 



lopods;" Fourth Annual Report, 1802, p. 460), which I append here for comparison 

 with that of Si/rint/urera.s : — " The whorl increases very rapidly by growth, and the 

 living chambers are short, with flaring apertures. The venter [peripheral area] is 

 elevated and gilibous, the lateral zones more or less gibbous, and the umbilical 

 shoulders tend to project in heavy ridges extending to and modifying the form of 

 the aperture. The dorsum in the young often till a late stage may have no impressed 

 zone. The sutures have broad, shallow ventral lobes, corresponding saddles at the 

 umbilical shoulders, and lobes on the dorsum with small annular lobes. The 

 siphuncle is ventral." 



I think there are few pah^ontologists who would not, as I do, regard the differ- 

 ences between Solciiudieilus and Si/niKjoccrafs as of sufficient importance to justify 

 their separation, the only essential character in which they are in agreement being 

 the peripheral situation of the si})huncle. 



That Professor Hyatt had no idea of suppressing Solenuclirihis in favour of 

 Syringoceras is shown by his having again introduced it in Eastman's translation of 

 Dr. von Zittel's ' Text-book of Palaeontology ' (p. •525), where he allots it a position in 

 the family 8oleuoclieilid;i?, along with other allied genera. S!/rui(joci'ri(s he places 

 in his famil}' Grypoceratidaj, which embraces the two Triassic genera Sijriuijocenis 

 and Gri/jioceraK. 



Dr. von Mojsisovics closes his generic description of Sijringoceras by stating that 

 it ranges from the Muschelkalk to the Carinthian stage (beds with Trachijceros 

 Aunotdes), but it is obvious that if Soleaocheilus were merged in Si/riiKjoceras the range 

 of the latter would extend not from the Muschelkalk only, but fi*om the Carboniferous- 



Looking at the matter from another point of view ; even if a fusion of the two 

 genera were justifiable, Sulenuchcilns having the priority would have to be retained 

 at the expense of Si/rinijuccras. 



(fcmis BKANcoL.t:i;A.s (see anfr, p. lol). 

 Bk.vnluckijas ExNi.sKiJ,Li;xEXSK, sp. nov. Plate XLVII, figs, o a, h. 



Dcscriptiuii. — Shell (? young) discoidal, compressed, umbihcated ; greatest thick- 

 ness at the umbilical margin ; height of outer whorl about three-tenths of the 

 (lianietcr iif the sliell. Whorls (r number) ; inclusion nearly complete ; umbilicus 

 deep, rather wide, with angular margin and vei'v steep sides. Whorl oval in 

 section, apparently a little higher than wide. Perijihery broadly rounded in the 

 very young shell (PI. XLVIH, figs. :^ ii,b), subangular, with a slight keel, at a 

 more advanced stage of gi'owtli (PI. XLVII, fig. o (i). Sides somewhat flattened 

 around tlie unil)ilieus, more roundeil in the pei'ipheral region. Extent of the body- 

 cliaml)er unknown. Chambers, known only in the very young shell, rather wide 



