Vol. 65.] THE GENUS LOXONEMA. 227 



Genus Hoemotoma, Salter. 



HOEMOTOMA INCEPIOE, Sp. UOV. (PI. XI, fig. 10.) 



Diagnosis. — Shell very elongated, composed of more than eleven 

 whorls : these are high, convex, and smooth. Lines of growth fine, 

 slightly irregular in strength, arching obliquely backward above 

 and still more obliquely forward below, forming a somewhat deep 

 sinus situated rather above the middle of the body-whorl and 

 slightly below the middle of the penultimate whorl. Band very 

 faintly limited. Aperture unknown. 



Eemarks and resemblances. — The holotype (No. 22447), the 

 only specimen known to me, is in the Museum of Practical Geology. 

 It is very imperfectly preserved, and is so much embedded in the 

 matrix that the earlier portion of the spire is but partly seen in 

 section. The lines of growth are distinct on a portion of the body- 

 whorl and the form and depth of the sinus are clearly indicated. 

 The band, however, is not very distinct ; there appears to be a faint 

 groove above the sinus on the body-whorl, but it is not definitely 

 limited below, and is barely discernible on the penultimate whorl. 



It has most resemblance to //. grayianum, Don.; 1 but the band is 

 situated higher, and does not appear to have had strong bordering 

 lines. In the character of the lines of growth it is very like 

 Sinuspira tenera (Barr.), 2 but although the band is indistinct, there 

 is evidence of its having existed, and so I refer the species to 

 the genus Hormotoma. This relationship appears all the more 

 probable since Sinusjnra, Perner (so far as I know) is only repre- 

 sented by one species which occurs in E-e 2 (Upper Silurian) ; 

 whereas species of Hormotoma occur as early as the Cambrian. 



Dimension s. — The length of the specimen figured (PI. XI, fig. 10) 

 is 39 millimetres, and the width as seen is 9 mm. ; this may not 

 represent the original dimensions, as the shell is crushed and broken. 



Locality and horizon. — Builth Bridge, in the Llandeilo ITags. 



The scarcity of material, which is widely scattered in many public 

 and private collections, has necessitated my seeking assistance from 

 numerous sources, and I desire to express my warmest thanks to all 

 who have most graciously helped by the loan of specimens and in 

 various other ways. In some instances the search for examples 

 was vain ; but the desire to aid was the same, and I am just as deeply 

 grateful. Thus I have received kind assistance from Mrs. Eobert 

 Gray, Dr. A. Smith Woodward, Mr. B. B. Newton, Dr. Kitchin, 

 Mr. H. A. Allen, Prof. Hughes, Mr. Cowper Peed, Prof. Sollas, 

 Dr. Scharff, Dr. Lee and Mr. Macconochie of the Geological Survey 

 of Scotland, Mr. H. J. Seymour of the Geological Survey of Ireland, 

 Prof. Holm, Dr. Hoyle, the Eev. D. M. D. La Touche, Sir Charles 

 Holcroft, Mr. Madeley, Mr. Edwards of the Worcester Museum, 

 Mr. LiunBeus Hope of the Carlisle Museum, Mr. Beynolds, and 

 Mr. C. D. Sherborn. 



1 Quart. Journ. Geol. Soc. vol. U (1899) p. 270 & pi. xxii, fig. 10. 



2 ' Syst. Sil . Centre Boheme ' vol. iv, Gasteropodes, par J. Perner, tome ii 

 (1907) pp. 131, 132, with text-figs. 177-79, & pi. xcix, figs. 41-44. 



