YoL 65.] THE GENUS LOXONEMA. 221 



growth may be seen on two of them ; the state of preservation 

 is too bad for certain identification. It occurred in the shale 

 at the top of the Wenlock Limestone, Dudley. There is also an 

 example of this species in Sir Charles Holcroft's collection from 

 the Wenlock Shale, Dudley ; although it is much crushed, the 

 surface is well preserved. 



LoXONEMA PEENEEI, sp. n0V. (PI. XI, fig. 1.) 



Diagnosis. — Shell composed of more than seven whorls. "Whorls 

 increasing gradually, but slightly adpressed at the suture, smooth, 

 "very convex. Lines of growth fine, sharp, and distinct, forming a 

 wide sinus near the middle of the whorl. Sutures slightly inclined. 

 Base convex, produced. No umbilicus. 



Remarks and resemblances. — This species differs from 

 L. sinuosum (Sow.) in having more convex whorls, deeper sutures, 

 and in the lines of growth making a broader submedian bend. 

 It is distinguished from L. planatum in the whorls being more 

 convex and less flattened above, and in the sutures being less oblique ; 

 also the curve of the lines of growth increases more gradually on 

 the whorls of the spire. 



Dimensions. — The holotype figured (PL XI, fig. 1) consists of 

 six whorls in a length of 30 millimetres, and measuring 14*5 mm. 

 in width. The shell is embedded in the matrix, and so flattened by 

 pressure that it appears broader than it must originally have been. 



Locality and horizon. — In the Museum of Practical Geology 

 are two specimens, one (the holotype) (No. 21069) from the Upper 

 Ludlow of Ludlow (PI. XI, fig. 1), the other (No. 21063) from 

 the Lower Ludlow of Bound Hill (Worcestershire). The Oxford 

 University Museum contains two examples from Ledbury : one is 

 represented by both external and internal moulds for which no 

 horizon is given, the other is from the Lower Ludlow. Mr. Madeley 

 has the external and internal moulds of a specimen, consisting of 

 about twelve whorls, which probably belongs to this species, but it 

 is not well enough preserved for certain identification ; it is from 

 the shale at the top of the Wenlock Limestone, Dudley. 



LOXONEMA EEENEEI, Var. DTJDLEYENSE, 110V. (PI. XI, figs. 2 & 3.) 



There is a well-preserved fragment (PI. XI, fig. 2) of a shell 

 (G 15700) in the Piper Collection in the British Museum (Natural 

 History), which is very slightly crushed and stands out convex 

 from the matrix. The lines of growth form a somewhat wider 

 sinus on the body-whorl, and curve back rather less obliquely 

 above than in the type. Only the body- whorl and a portion 

 of the penultimate exist, measuring 19 millimetres in length and 

 10-5 mm. in width. It is from the Lower Ludlow of Ledbury 

 Tunnel. 



A specimen (No. 21066) in the Museum of Practical Geology is 

 closely akin to this ; the lines of growth are similar in form, being 

 less strongly curved than in the typical L. perneri ; they are also 

 coarser and less closely packed. The shell is embedded in the 



