130 



To the genus Loxonema, Phillips {Pal. Foss. p. 98, 1841), belong 

 elongated shells devoid of spiral keels, having the edge of the 

 outer lip sigmoidal in form, with its general direction inclined 

 several degrees to the right of the apex of the shell. The whorls 

 are usually ornamented with raised threads or with ribs, which 

 approximate in general direction with the lines of growth, and are 

 therefore sigmoidal in form, like the edge of the outer lip. No 

 trace of anything approaching a notch or sinus ever exists in this 

 genus. Many of the species bear a close resemblance to certain 

 members of the genus Melania. 



Genus Loxonema (Phillips). 



Shell elongated, spiral ; whorls more or less convex, their upper 

 edges adpressed against the next above. Mouth longer than wide, 

 attenuated above, effuse below, with a sigmoidal edge to the outer 

 lip. The whorls are ornamented with longitudinal threads or ribs, 

 generally arched like the lines of growth ; and they are always 

 devoid of spiral keels. 



Loxonema urei (Flem.) PI. IL fig. i. 



Turitella urei, Fleming, 1828, British Animals, p. 305. 



Shell very small and slender, composed of about eleven whorls, 

 which are flattened on their upper surface, and are convex below. 

 They are each ornamented with fifteen or sixteen slightly sigmoidal 

 ribs, which are inclined at a small angle to the axis of the shell. 

 These ribs are strong in proportion to the size of the shell. No 

 umbilicus. 



In the Catalogue of the Western Scottish Fossils, p. 56, this shell 

 has been entered in the genus Murchisonia, the longitudinal ribs 

 and the absence of a slit in the outer lip having been overlooked.* 

 It was briefly described by Fleming (Brit. Animals, 1828, p. 305,) 

 as Turitella urei, and was figured by the Rev. David Ure in his 

 History of Riitherglen and East Kilbride, 1793, PI. xiv. fig. 7. Also 

 entered as T. urei in Morris's Catalogue of British Fossils, 2nd 



* I am informed that the mistake in the genus was made in transcribing the 

 lists. 



