﻿566 OBSEKVATIONS OK SOME OE THE LOXONEMATIDJE. [Aug. I905, 



moulds. In general form this species resembles Loxonema in- 

 tumescens, 1 Lindstrom, but there is no spiral ornamentation in that 

 species. It is much less slender than L. (?) fasciatumf Lindstrom, 

 which possesses an indistinct band, having however no bordering 

 lines nor accessory spiral striae. 



Dimensions. — The length of the specimen in the Museum of 

 Practical Geology, having the apex broken and consisting of about 

 four whorls, is 34*5 millimetres ; the width = 17 mm. The biggest 

 of Prof. Groom's examples is imperfect, both at the apex and at 

 the base : it consists of about five whorls in a length of 28*5 mm. ; 

 the penultimate whorl is 10 mm. in width. 



Locality and Horizon. — The specimen in the Museum of 

 Practical Geology is from the Aymestry Limestone, near Ledbury. 

 Prof. Groom's specimens are from the Lower Ludlow, Aymestry 

 Limestone included (63), at Llangadock. 



Loxonema. psetjdoeasciatum, sp. nov. (PI. XXXVII, fig. 2.) 



Diagnosis. — Shell elongated, turriculated, composed of numerous 

 whorls. Whorls increasing gradually, adpressed at the suture, very 

 slightly convex below. Ornamented by fine spiral lines, two of 

 which are sometimes stronger than the others, and produce the 

 appearance of a band situated above the middle of the whorl. 

 Lines of growth sigmoidal, numerous, stronger lines being inter- 

 calated at intervals among the fine lines, and the greatest sinuosity 

 occurring above the middle of the whorl. Aperture unknown. 



Remarks and Resemblances. — I have met with only one 

 specimen, which is in the Sedgwick Museum at Cambridge. It is 

 referred to as MurcMsonia by J. W. Salter in his ' Catal. Cambr. & 

 Silur. Foss. Cambridge Museum ' 1873, p. 155, sp. 3, b 809, and is 

 marked Hormotoma. The structure above described shows that it 

 is distinct from that genus, and more nearly allied to Loxonema. 

 It greatly resembles L. Grindrodii, but the whorls are higher, 

 more flattened, and the greatest sinuosity of the lines of growth 

 is situated higher up the whorl. 



Dimensions. — The shell is imperfect, only three whorls being 

 preserved, which have a length of 46 millimetres ; the greatest 

 width = 24 mm. 



Locality and Horizon. — Wenlock Limestone^ Dudley. 



EXPLANATION OF PLATE XXXYII pars. 



Fig. 1. Loxonema Grindrodii, sp. nov. xlf. Aymestry Limestone, near Led- 

 bury. Museum of Practical Geology, Jermyn Street, London. 

 2. Loxonema psetidofasciattim, sp. nov. Nat. size. Wenlock Limestone, 

 Dudley. Sedgwick Museum, Cambridge. 



1 ' Silurian Gastropoda & Pteropoda of Gotland' Kongl. Svensk. Vet.-Akad. 

 Handl. vol. xix (1881-84) No. 6, p. 143 & pi. xv, fig. 6.. 



2 Ibid. p. 144, pi. xv, fig. 11 & pi. xx, fig. 7. 



[For the Discussion, see p. 578.] 



