CYPR.EA. 25 



dental or abnormal appearance. The form is exceedingly 

 like that of SowerhtjL, but the ends are more thickened and 

 produced. 



75. onyx, Linn., (f. 209-212).— C. testa pyriforrni, umbi- 

 licata, fasciis tribus latissimis zonata, fusco-nigricante ; ex- 

 tremitatibus, lateribus, basique saturatioribus, hiatu dorsali 

 sinuato ; basi convexa ; columella postice brevissima ; aper- 

 tura subhianti, postice retrorsa ; labio postice elevato ; denti- 

 bus rotuudis, crassis, circa 18 et 19; variat dorso lacteo, 

 lateribus aurantio marginatis, variat etiam omnino pallide 

 fulvo. 



76. pyrum, G/mel., (f. 202-205). — C. testa quam G. onyx 

 angustiori, extremitatibus obtusioribus, ad spiram haud um- 

 bilicata, colore fusco-aurantio ; dorso castaneo, variegato. 



77. physis, Brocchi, (f. 200, 201). — C. testa quam G. pyrum 

 breviori, tenuiori ; apertura angustiori ; dentibus minutissi- 

 mis ; basi albida ; lateribus et extremitatibus fulvo-aurantiis ; 

 dorso ca3rulescente,maculis castaneisirregularibus lentginoso. 



Note. — Onyx, ■pymm, physis. For some time I have tried 

 to establish a collateral distinction, by which the pale fawn 

 variety of onyx might be separated from the two normal con- 

 ditions. The slopes of the back towards the ends appeared 

 to be more gradual, the ends thicker, and the umbilicus less 

 distinct ; but an examination of intermediate forms in Miss 

 Saul's collection, subsequently convinced me that the three 

 varieties must remain united under one specific name. I 

 have described the dark brown shell as the type, because 

 probably the normal condition. Pyrum may be distinguished 

 at a glance, although it is difficult to name absolute cha- 

 racters. It is a much less ventricose shell, with more ob- 

 tuse ends, and no distinct umbilicus. Physis is a shorter 

 shell, and at once distinguished from onyx and jiyrum, by 

 the narrow aperture and minute teeth. 



78. Walkeri, amy, (f. 123, 124, 125, 536).— C. testa ob- 

 longo -pyriforrni, umbilicata, depressiuscula ; dorso caeruleo- 

 albicante, trizonato, fasciis undato-maculatis, punctis minu- 

 tissimis lentiginoso ; lateribus subflavis, guttis nigro-fuscis 

 sparsim notatis, extremitatibus rotundis, labii postica pro- 

 ducta, columellas postica brevi rotunda, dentium interstitiis 

 basique purpureis. 



Note. — A little in form, and something in the delicacy of 

 colouring, places this shell not far from pulckella aaipyri- 



E 



