40 DEVONIAN FAUNA. 



Affinities. — It appears to be nearest to M. elevata, Wliidborne,^ from Lummaton, 

 but to be distinguishable by its still broader whorls, and turbinate instead of 

 conical spire. 



Mr. Roberts seems to have been inclined to identify it with Loxonema lindiim, 

 Phillips, sp. ;^ but it appears separable from that shell by its broader and more 

 exposed whorls, its loftier spire, and its smooth surface. 



It is very distinct from all the Carboniferous shells described by de Koninck. 



2. Macrochilina pusilla, n. sp. Plate V, fig. 3. 



Description. — Shell very small, rather elongate, of four or five volutions. 

 Spire conical, elevated, turrited, less than half the height of the shell. Suture 

 rather deep and subacute. Whorls narrow, very much exposed, rapidly 

 increasing, convex on the shoulder, rather flattened on the back, and curving in to 

 the lower suture. Body-whorl large, diffuse, subglobose, rapidly narrowing in 

 front. Surface smooth. 



Size. — Height 3 mm., width 2 mm. 



Localities. — There are two specimens from Pilton and one from Fraukmarsh 

 in the Porter Collection, and one from Upcott Arch Quarry in Miss Partridge's 

 Collection. 



Bemarlcs. — It is of course possible that these minute shells may be the fry of 

 a larger species, but I know of none with which there is reason to identify them. 

 It seems to me, therefore, that they must be regarded as a new form. 



Affinities. — It appears to have a higher spire and less enveloped whorls 

 than M. imhricata, Sowerby, sp. ;^ more convex and less enveloped whorls than 

 M. suhimbricata, d'Orbigny, sp. ;* and much narrower whorls than any of the 

 other South Devon species. 



It seems to have a higher spire than M. monodontiformis , de Koninck,^ and a 

 wider body-whorl than M. minor, de Koninck.^ 



1 1891, vol. i, p. 170, p]. xvii, figs. 11—12 a. 



2 Ibid., p. 170, pi. xvii, fig. 13. 



•^ Ibid., p. 164, pi. xvii, figs. 1 — 4. 



* Ibid., p. 166, pi. xvii, figs. 5—7. 



5 1881, de Koninck, ' Ann. Mus. Eoy. H. N. Belg.,' vol. vi, pt. 3, p. 28, pi. iii, figs. 32, 33. 



« Ibid., p. 35, pi. iii, figs. 28, 29. 



