52 DEVONIAN FAUNA. 



1. AcLisiNA LONGissiMA, n. sp. Plate V, fig. 10. 



Description. — Shell minute, aciculate, of very numerous whorls. Whorls nearly 

 evenly convex, very narrow, very slowly increasing, much exposed. Sutures 

 simple, rather deep. Ornament consisting of six fine, acute, elevated, distant, 

 spiral threads, placed at equal distances on the whorl, and separated by wide 

 concave interspaces. 



Size. — A fragment with seven whorls is about 3 mm. long. 



Localitij. — There is a specimen showing seven whorls in the Porter Collection 

 from Pilton. 



Remarks. — This tiny fossil differs from M'Coy's description of Loxonema 

 polygyratum,^ from the Yellow Sandstone Group of the Irish Carboniferous, by 

 having six ridges instead of five, by having narrow whorls, and by being still 

 more aciculate. De Koninck regards that species as belonging to Aclisi^ia, and 

 not to Murchisonia. 



Affinities. — Aclisi^ia multicristata, ffihlert,^ is distinguished by having decidedly 

 more numerous spiral ridges. 



From Murchisonia similis, Trenkner,^ it differs in being much more aciculate 

 and having more numerous ridges. 



V. Family — Solaeiid^, Chemt, 1859. 

 1. Genus — Euomphalus, Sowerhy, 1814. 

 1. Euomphalus vermis, n. sp. Plate VI, figs. 4, 4 a, 



1841. Euomphalus serpens, Phillips (pars). Pal. Foss., p. 94, pi. xxxvi, figs. 



172c— e (only). 

 1844. — — M'Coy. Sjuopsia Carb. Foss. Ireland, p. 37. 



1853. — — Oeinitz. Verst. Grauw. Sachsen, pt. 2, p. 43. 



1890. — sp., Wkidhorne. Dev. Fauna, vol. i, p. 243. 



Description. — Shell minute, nearly discoid. Spire of about four whorls, very 

 slightly elevated above the body- whorl. Whorls slowly increasing, nearly circular 



1 1844, M'Coy, ' Sjn. Carb. Foss. Ireland,' p. 30, pi. iii, fig. 1. 



2 1887, (Elilert, 'Bull. See. Etud. Sci. Angers,' 1887, p. 10, pi. viii, figs. 4, 4 a. 

 2 1867, Trenkner, 'Palaont. Novitat.,' pt. 1, p. 10, pi. i, fig. 17. 



