GASTROPODA. 



8jrnop*u of IMvurotomarlldo.) 



\ V. HfitMiiTiiMA. Suiter, 1869.* Shell elongate, beaded, practically imperforate, 



composed of rather numerous (eight to fourteen) rounded or subangular whorls; 



iminate >ul>ovate. narrow and more or less prolonged below; outer lip 



with a l-road and deep >shaped notch and no slit; hand median or submedian, 



generally obscure. of moderate width. Hat or slightly concave, in the perfect condi- 



tion margined on each side by a delicate raised line; surface marked with lines of 



growth only: these are never very sharp and always sweep backward very strongly, 



from below especially, to the band. Typo. //. sulteri 1'lrich [ ^M. (//.) gracilis 



er. not Hall]. 



\\ I. C.KMM-AI-MS, (Khlert, 1887. f Similar t<> llnrmotoma but the shells are 

 longer, and composed of more numerous depressed whorls. Axis perforate, the 

 nmliilicns small Imt extending quite to the apex. Aperture rounded, not produced 

 below; inner lip thin. Type, Murchisonin (Caelocaulus) davidsoni (Ehlert. 



\VH. TIKKITOMA. ii. gen. (I Irich.) High shells, consisting of numerous 

 whorl.-; whorls somewhat flattened, convex above, slightly concave in the middle, 

 and mo-t prominent in the lower part where the band is situated; other features 

 apparently a- in H"rnif<nn<i . Type. Murcliisotiiti arrru Hillings. Range, Lower and 

 I'pper Silurian. 



This is a well marked group of species and readily distinguished form Honno- 

 t'liiui (to which the group is related) by the flattened instead of uniformly rounded 

 volutions, and by the lower position of the band. For the present the new genus 

 will include the following species: .l/wn7/ />/'/ <t<l Hillings, Calciferous; M. acren 

 Hillings. Quebec; M. lnjilunni Hall, Niagara; M. boylei Nicholson, M. constricta 

 Whiteave-. (Juelph; and M. r,n,i landstrOm, I'pper Silurian of Gotland. 



\VIII. SOLKNOHPIRA, n. gen. (llrich.) Small shells usually, forming a high and 



slowly enlarging spire, consisting of numerous, generally depressed volutions; 

 near the middle of each whorl and occupying nearly a fourth of its hight, the spiral 

 band forms a deep channel between two salient thin ridges; the flat or convex slopes 

 above and beneath the band may be free of ridges, or there may be a third above 

 and a fourth below, or there may lie. including those bordering the band, as many 

 as five or even six on each whorl. Outer lip with a broad >shaped sinus hut no 

 linear slit. Type, Kunema pagoda Salter. 



Doubtful and insufficiently /. > nn<l iini :< species usunlli/ 



'ml t I .(.///// //;/ Mm. 



MPBCHWOKIA, d'Archiac and Verneuil. 1S41. (Hull. Soc. li-'ol. France, vol. I-'. 

 p. 154.) We prefer not to give a description of this gemi* at this time, because 



t ,nadln < main*. Dec4e I. p. U. 



Hull. Sur.irEtud.Helralir p. J. 



