Vol. 65.] THE GENUS LOXONEMA. 219 



of that species in the Sedgwick Museum shows no structure, and 

 is too imperfectly preserved to admit of a satisfactory comparison ; 

 also the lines of growth as represented in the figure are much more 

 slightly curved. The lines of growth on L. latouchei resemble 

 those of L. sinuosum (Sow.) in form, but the greatest sinuosity is 

 situated lower on the whorl.. 



Dimensions. — The holotype is the longest specimen in 

 Mr. La Touche's collection : it consists of twenty-two whorls 

 in a length of 55 millimetres ; the width = 13 mm. (PI. X, 

 fig. 4 a). A shell in the Manchester Museum gives evidence of 

 having possessed eighteen whorls, which measure 655 mm. in 

 length and about 13 mm. in width. A single whorl of this specimen 

 is figured on PI. X, fig. 4 b. 



Locality. — All the specimens are from Stoke Wood Quarry. 



Horizon. — Lower Ludlow. 



LOXONEMA. LEDBTJRIENSE, Sp. UOV. (PI. X, figS. 5 rt & 5 b.) 



Diagnosis. — Shell very elongated, slender. Whorls more than 

 ten in number, increasing gradually, flattened or slightly concave 

 above, prominently convex below. Lines of growth distinct, fine, 

 close together, with stronger lines at irregular intervals, curving 

 very obliquely backward above and forward below, forming an 

 almost right-angled bend high up on the whorl. Sutures oblique. 

 Aperture longer than wide, imperfectly known. 



Remarks and resemblances. — The holotype is in the 

 Oxford University Museum ; it is embedded in the matrix and 

 neither apex nor base are preserved, but the surface is tolerably 

 well seen. Two other specimens associated with it from the same 

 locality are probably identical ; but they are much crushed internal 

 and external moulds, and no lines of growth are visible. There is 

 also an example (No. 21070) in the Museum of Practical Geology 

 which greatly resembles this in its slender form and in the high 

 position of the sinus. It is flattened by pressure, and, although 

 embedded in the matrix, gives evidence of having possessed more 

 than ten whorls. This species is distinguished from L. latouchei 

 by its more convex whorls, the higher position of the sinus, and 

 by its probably more slender form. It differs from L. intumescens, 

 Lindstr., in having higher whorls, a broader sinus, and finer lines 

 of growth. 



Dimensions. — The holotype figured (PI. X, figs. 5 a & 5b) 

 measures 36 millimetres in length, and the greatest width exposed 

 is 9 mm. The shell in the Museum of Practical Geology is 40 mm. 

 long. 



Locality and horizon. — The holotype and the moulds associ- 

 ated with it are from the Lower Ludlow of Ledbury. The specimen 

 in the Museum of Practical Geology, Jermyn Street, is from the 

 Upper Ludlow ; the locality is not quite certain, Ludlow being 

 only surmised. 



