GASTEROPODA. 181 



3. BuLL^A SCABRA. MiilL Tab. XXI, fig. 12, a — c. 



LOBARIA SCABRA. MiiU. Zool. Daii. t. 7, fig. 1, 17/6. 

 Scaphander catenata. Leach. Moll. p. 3.^, 1S20. 

 Bulla pectinata. BiUwyn. Descrip. Catal. 1817. 



— W. Wood. Ind. Test. 1828. 



BuLLiNA GRANULOSA. Sars. Beskrivelser og lagttagelser, p. 75, pi. 14, fig. 36, 1835. 

 Bulla angustata. Phil. En. Moll. Sic. p. 121, t. 7, fig. 17, 1836. 

 BuLL.EA punctata. - - vol. ii, p. 95, 1844. 



Bulla dilatata. S. Wood. Illust. in Mag. Nat. Hist. p. 462, pi. 7, fig. 3, 1839. 



— catenata. iS. Wood. Catalogue 1842. 



— lixeolata (?). Gould. Invert. Massacbus. p. 169, fig. 99, 1841. 

 Philine scabka. Lovi'-n. Ind. Moll. Scand. p. 9, 1846. 



Bulla. Encyclopedie Methodique, pi. 360, fig. 3. 



B. Testa angustd, suhcijlindraced, tenui fragili, inferne dilatata ; densissime striata, 

 striis divergentihus, cateniformibus ; spird distinctd, convexd, obtiisd ; laljro acitto, sine 

 umbilico. 



Shell subcylindrical, thin, and fragile ; volutions loosely enrolled ; aperture elongate 

 and gaping, e.xpanded at the lower part, externally striated, with impressed chain-like 

 diverging striae ; outer lip sharp, a little curved ; inner lip slightly reflected, and 

 without an umbilicus ; muscular impression distinct and deep. 



Axis, 5 an inch. 



Locality. Cor. Crag, Sutton. Recent, Scottish Coast. 



This is a very rare and an extremely fragile shell, and is no doubt identical with 

 the northern British species, which, in the recent state, is nearly transparent ; that 

 character is, of course, lost in the fossil. The upper part of the volution is rather 

 romided, causing a deep suture, or subcanal, around the spire, which is low and convex. 

 The beautiful chain-like striae encircle the upper part of the shell horizontally, but 

 diverge towards the base, running parallel to the inner lip ; they are formed of small 

 oval depressions, like the links of a chain, visible from within, and producing, at the base 

 of recent individuals, a fimbriated edge. A slight contraction above the middle of the 

 volution is visible in some specimens, but not in all. The aperture is expanded at the 

 lower part, and a muscular impression is visible within the outer lip. This impression 

 is separated in the centre, and deeply impressed both above and below, as if the animal 

 adhered firmly to the shell ; the outer lip is rounded at the upper part, and the spire is 

 always visible. The left lip is slightly reflected, forming a ridge, but there is no um- 

 bilicus. M. Philippi, in his second volume, has changed the name of angustata to that 

 of punctata, Adams, which, 1 believe, is a very diS"ercnt shell. 



