﻿226 DEVONIAN FAUNA. 



what it indicates, and there is no sign of a similar mark on any of the other 

 whorls. It is possible that it may be the remains of a colour-band. 



The present species seems to be distinguished by its slender shape and the 

 great breadth of its whorls. 



H. elongata, Eichwald, corresponds exactly in shape, and is in all probability 

 the same species, though its ornament seems to have been rather more indistinct. 



Affinities. — It approaches most nearly to H. tenuireticulata, fig. 9, from which 

 it is distinguished by its much less elongate form, by the direction of the stride, 

 and by the much greater coarseness of its ornamentation. In spite of these 

 differences it bears so great a general likeness to that shell that I am in 

 considerable doubt whether to regard it as a distinct species or only as a variety 

 of it. It is clearly distinguished from E, duplisulcata by its less conical form, 

 and by the different character of its ornamentation ; and from H. costata, 

 Sandberger, by its broader whorls and less conical form. 



Mr. Vicary's specimen was labelled by Salter " Loxonema HennaMana" 

 Sow. sp., but Sowerby's figure of his Terebra HennaMana 1 shows that his shell is 

 distinguished by having narrower whorls, and coarser, more direct, and straight 

 striae, as seen in our figure, PL XVIII, fig. 16, of that shell. 



Turritella tenuicarinata, Miinster, 2 differs in having a slight keel immediately 

 below the suture, and in being otherwise smooth. 



Melania absoluta, Goldfuss, 3 has decidedly higher whorls and more direct striae. 



Loxonema Iseve, F. A. Romer,* is very similar, but its spire is longer and its 

 surface is smooth. Clarke, 5 moreover, states that it has varices. 



Holopella elegans, Eichwald, 6 is almost identical in shape, but it is distinguished 

 by possessing fine spiral, and no longitudinal lineations. 



1 1840, Sow., ' G-eol Trans.,' ser. 2, vol. v, pt. 3, pi. lvii, fig. 22. 



2 1840, Miinster, ' Beitr.,' pt. 3, p. 89, pi. xv, figs. 20 a, b. 



3 1844, Goldfuss, 'Petref. Germ.,' vol. iii, p. 110, pi. cxcvii, fig. 13. 



4 1850, F. A. Eoraer, ' Beitr.,' pt. 1, p. 35, pi. v, fig. 11. 



5 1883, Clarke, ' Neues Jahrb. f. Min.,' Beil.-Band iii, p. 365, pi. v, fig. 21. 



6 1800, Eichwald, ' Lethsea Eossica,' p. 1634, pi. xliv, fig. 25. 



