GASTEROPODA. 29 



from E. subulata in the possession of a curved lip, which appears to be the only 

 distinction from that shell upon which d'Orbigny's species of subula is founded. With 

 this, and omitting, for the reason just given, stenostoma from the category, the following 

 ten species of what I refer to the genus Eulima, with the exception of the derived robusta, 

 have formed part of the Crag fauna, one of them, the doubtful similis, belonging to the 

 newer or Red division only. 



It must be confessed that some of these species are separated upon distinctions such 

 as in more variable genera are considered only of varietal importance. Continental 

 conchologists seem to consider the form of the outer lip as a good auxiliary character for 

 separation, but I am unable to say if this be one on which a safe reliance can be placed. 

 Shells of this genus are of a porcellanous structure and opaque, the lines of increase being 

 invisible. 



1. Eulima polita, Linn. Crag Moll., vol. i, p. 96, tab. xix, fig. 1 b. Curved outer lip. 



2. — intermedia, Cantraine. Crag Moll., vol. i, p. 96, tab. xix, fig. 1 a. Lip 



nearly straight. 



3. — subulata, Donovan. Crag Moll., vol. i, p. 96, tab. xix, fig. 3. Straight 



outer lip. 



4. — subula, D 'Orbiyny. Prodrom., iii, p. 34, No. 478. Curved outer lip. 



5. — bilineata, Alder. Sup. Crag Moll., p. 66. Spirally coloured. 



6. — similis?, D' Orb. Sup., Crag Moll., p. 65, tab. vii, fig. 6. Spire inflected. 



7. — glabella, 8. Wood. Crag Moll., p. 98, tab. xix, fig. 2. Apex obtuse. 



8. — Hebe, Semper. 2nd Sup., Tab. IV, fig. 18. Elongated aperture. 



9. — Naumanni ?, von Konen. 2nd Sup., Tab. IV, fig. 22. 



10. — robusta, A. Bell. 2nd Sup., Tab. IV, fig. 17. Convex volution. 



I 

 Rissoa costulata, Alder. 2nd Sup., Tab. IV, fig. 23. 



Rissoa costolata, Alder. Mag. Nat. Hist., xiii, p. 324, pi. viii, figs. 8, 9. 



— Fori, and Hani. Brit. Moll, vol. iii, p. 103, pi. lxxvii, figs. 4, 5. 



— — Jeffreys. Brit. Conch., vol. iv, p. 35, pi. lxviii, fig. 1. 



Locality. Cor. Crag, Sutton. 



A single specimen has very recently come into my hands from Dr. Reed, with the 

 above-named locality given to it by Mr. A. Bell. This resembles in form Rissoa crassi- 

 striata of ' Crag Moll./ vol. i, tab. xi, fig. 13, but that shell has large and coarse spiral 

 striae, of which the present species is destitute. 



Rissoa paeva?, Da Costa. 2nd Sup., Tab. IV, fig. 21. 

 Locality. Cor. Crag, Sutton. 



