564 MISS J. DONALD ON NEW AND LITTLE-KNOWN 



limiting the band ; of these, only one or two are visible on the 

 upper whorls. Lines of growth curving backwards to the band 

 above and forwards again below. Mouth imperfectly preserved. 



The shell figured is in the Tate Collection, Alnwick Museum, in 

 which there are also fragments of other specimens referable to the 

 same species. The surface of all is badly preserved, and the apex 

 of the best specimen is embedded in the matrix, leaving only seven 

 whorls visible. 



It resembles M. elongata, PortL, more nearly than any other 

 Carboniferous species ; but may be distinguished from it by its 

 much smaller spiral angle, by the greater strength of the keels 

 above the band, as well as by the greater relative width of the 

 band. 



Length 23 millim. ; width of body-whorl 7| millim. ; width of 

 penultimate whorl 6 millim. ; height 4 millim. 



Locality. Ho wick. 



Formation. Upper part of the Yoredales. • 



Section Hypergonia. 



Shell turriculated, composed of numerous angular whorls orna- 

 mented with keels. Sinual band situated above the angle, a cha- 

 racteristic which distinguishes it from Goniostroplia, (J^h\. It agrees 

 with Stegocelia in the position of the sinus, but differs in not having 

 the inner lip reflected on the columella, and in not being umbilicated. 



MuRCHisoNiA (Hypeegonia) QUA deicaeinata , M'Coy. (PI. XYI. 

 figs. 3 to 6.) 



Murchisonia quadricarinata, M'Coy, 1844, ' Syn. of the Char, of 

 the Carb. Limest. Foss. of Ireland,' p. 42, pi. v. fig. 9 ; A. d'Orbigny, 

 1850, ' Prodr. de Paleont. stratigr.' t. i. p. 123. 



Non Murchisonia quadricarinata, L. G. de Koninck, 1851, 

 * Descr. des Anim. foss. du terr. Carb. de la Belgique,' Supplement, 

 p. 697, pi. Iviii. fig. 15. 



Murchisonia quadricarinata, Morris, 1854, Cat. of Erit. Eoss. 

 p. 259 ; P. M'Coy, 1855, ' System. Descr. of Brit. Pal. Poss.' p. 531 ; 

 E. Griffith, 1860, Journ. Geol. Soc. Dublin, vol. ix. p. 90; 

 J. Armstrong, J'. Young, and D. Robertson, 1876, ' Cat. of the 

 Western Scot. Foss.' p. 5^ ; J. J". Bigsby, 1878, ' Thes. Devonico- 

 Carboniferus,' p. 327. 



Non Murchisonia quadricarinata, L. G. de Xoninck, 1883, 

 ' Eaune du Calc. Carb. de la Belgique,' vol. viii. pt. 4, p. 20, 

 pi. xxxiv. figs. 17, 18. 



Murchisonia quadricarinata, E.. Etheridge, 1888, ' Eoss. of Brit. 

 Islands,' vol. i. Pal. p. 301. 



Shell elongated, turreted. Whorls angular, numerous, gradually 

 increasing. Angle a little below the middle of the whorl, bearing a 

 strong keel and having two slighter keels above and two below ; of 

 the latter that next below the angle is generally the stronger. The 

 widest space is that between the keel on the angle and the lower of 



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