Vol. 62.] OMOSPIRA, LOPHOSPIRA, AND TURRTTOMA. 567 



species, fourteen of which are in the Sedgwick Museum, Cambridge, 

 nine in the British Museum (Natural History), three in the Museum 

 of Practical Geology, London, and one in the Bristol Museum. 



Dimensions. — The specimen that would have been the largest 

 if entire is in the Sedgwick Museum, Cambridge ; it has barely 

 three whorls, but has the aperture remarkably well preserved ; it 

 has already been figured by Mr. F. E. Cowper Reed, and is figured 

 again (PI. XLIY, fig. 7) in order to show the inner lip ad- 

 pressed against the body-whorl. It measures 34 millimetres in 

 length and 26 mm. in width. An example nearly as large in the 

 same collection has the apex broken, leaving four whorls which 

 = 36 mm. in length and 25 mm. in width. The smallest 

 individual in this collection has four whorls in a length of 10 mm., 

 whose greatest width = about 8*5 mm. The specimen of 

 Prof. Sollas, figured in PI. XLIY, fig. 6, consists of five whorls in 

 a length of 35 mm., the width measuring 27 mm. In another 

 example with the aperture, which is in the British Museum (Natural 

 History), figured in PL XLIV, fig. 8, the inner lip appears detached, 

 as is frequently the case in Lophospira ; but perhaps this is due to 

 the state of preservation. 



Locality and Horizon. — The specimens in the Sedgwick 

 Museum and seven in the British Museum are from Dudley. That 

 in the Bristol Museum is from Cae Castell, Ehymney River. 

 Three in the Museum of Practical Geology are severally from 

 Callow Farm, Martley (Worcestershire); the Herefordshire Beacon ; 

 and Wenlock Edge. The horizon of all these is the Wenlock 

 Limestone, of which formation L. cydonema appears to be a charac- 

 teristic fossil, as hitherto I have not met with it elsewhere. 



Lophospira pclchea, M'Coy. (PI. XLIY, figs. 10 & 11.) 



JlnrcJdsonia pulchra, F. M'Coy, 1846, ' Syn. Silur. Foss. Irel.' p. 16 & pi. i, fig. 19; 

 ? 1852, ' Brit. Palaeoz. Foss.' p. 294 & pi. i K, tig. 42 ; J. Morris, 1854, 'Catal. 

 Brit. Foss.' 2nd ed. p. 259; J. Sowerby, 1867, 'Siluria ' 4th ed., Appendix, 

 p. 532 ; J.J. Bigsbv, 1868, ' Thes. Silur.' p. 159 ; non J.W. Salter, 1873, fc Catal. 

 Cambr. & Silur. Foss.' pp. 69 & 83 ; A. C. Ramsay, 1881, Mem. Geol. Surv. 

 vol. iii, ' Geol. N. Wales ' 2nd ed. pp. 404, 414, 431 & 437 ; R. Etheridge, 1888, 

 ' Foss. Brit. Is.' vol. i (Palaeozoic) p. 113; non H. Woods, 1891, ' Catal. Type 

 Foss. Woodward. Mus.' p. 107; non J. Horne & B. N. Peacb, 1899, Mem. 

 Geol. Surv. ' Silur. Rocks of Britain ' vol. i, p. 682 ; non B. N. Peach, J. Horne, 

 & A. Macconochie, 1901, in ' Fauna, Flora, & Geology of the Clyde Area ' publ. 

 by Local Comm. for Meeting of Brit. Assoc. Glasgow, p. 438. 



Diagnosis. — Shell of medium size, subcorneal, composed of 

 about seven whorls. Whorls increasing at a moderate rate, sub- 

 angular near the middle of the penultimate whorl, and below the 

 middle of the body-whorl, flattened or scarcely convex above, 

 slightly convex below. Band situated on the angle, prominent, 

 rather convex, margined on each side by a raised thread, with 

 another thin thread down the middle. Ornamentation consisting 

 of a thread immediately below the suture, and another stronger one 

 a short distance below the band. Lines of growth strong, sub- 

 lamellose, sharply bent on the uppermost keel, curving back to the 



Q. J. G. S. No. 248. 2 r 



