172 



HARPA. 



from the typical form of 77. minor in the opposite direction to that 

 of H. crassa, being elongated, thin, and narrow, with the aperture 

 slightly contracted towards the spire and widened in front. 



12. H. virginalis, /. Gray, f. 34, 35. — H. testa alba, 77. crosses 

 simili, sed spira breviore et ruagis declivi ; costis obtusis, superne 

 angulatis, interstitiis unicostatis. — I am indebted for a drawing of 

 this unique shell, which I have seen, to the kindness of J. Gray, 

 Esq., of Glasgow, who has had it in his collection for some years. 

 It may quite possibly prove a variety of II. crassa, but the penulti- 

 mate whorl is less elevated, aud an intercostal riblet, which occurs 

 accidentally and irregularly in some species, assumes a rather re- 

 gular and formal aspect in the more advanced part of this interest- 

 ing shell. 



INDEX OF SPECIES AND SYNONYMS. 



nniiquata, Ch. — nablium, 4. 

 articularis, Lamk., 5, f. 9, 10, 11. 

 Cabritii, Bern.— ventricosa, 2. 

 cancellata, Chem., 6, f. 26. 

 oostata, Linn., 1, f. 4, 5, 23. 

 crassa, Miirch, 10. f. 30, 31. 

 crenata, Sw. — Bivoliana, 7. 

 Davidis.— costata, 1 . 

 gracilis, Brod., 11, f. 32, 33. 

 imperialis, Lamk. — costata, 1. 

 Lyra-Bavidis, Mart. — costata, 1. 

 minor, Rumpli., 9, f. 27, 28, 29. 



multicostata, Sowb. — costata, 1. 

 nablium, Mart., 4, f. 14-17, 24. 

 nobilis, Rumpli., 3, f. 1, 2, 3. 

 oblom/a, Schm. — minor, 9. 

 llivoliana, Lesson, 7, f. 12, 13. 

 rosacea, Mart. — rosea, 8. 

 rosea, Klein, 8, f. 6, 7, 8. 

 solido, A. Ad. — crassa, 10. 

 striata, Lamk. — ventricosa, 2. 

 striatula, A. Ad. — nablium, 4. 

 ventricosa, Lam k., 2, f.18-22, 25. 

 virginalis, /. Gray, 12, f. 34, 35. 



