209 



4. Trochus (Euchele) alabastrum. Tro. testa subdepresso- 

 conoidea, august e profunde umbilicata ; spira exserta ; sutura 

 peculiariter profunde excavata ; (infractions deinde concavis, et 

 fortiter tricarinatis, carinis subirregulariter undatis et exqui- 

 site serratis; calcareo-alba, carinis punctis nigris subdistantibus 

 peculiariter notatis. 



Long, -f poll., lat. -| poll. 



Hab. Island of Diego Garcia, a dependency of the Mauritius. 



Of this very striking species there is a second specimen in the col- 

 lection of Mr. Cuming. It is of a pure chalk-white substance, 

 strongly spirally grooved and keeled throughout, the keels being 

 sparsely dotted with black. ■ lv)K ivi tii 



5. Murex Barclayi. Mur. testa trigono-ovata, canali bre- 

 viuscula, recurva ; spira brevi, acuminata ; anfractibus transver- 

 sim tenuissime serrato-liratis et striatis } longitudinaliter tri- 

 varicosis, varicibus basin versus conspicue fimbriato-laminatis, 

 interstitiis triseriatim tubercidatis et nodatis ; rosaceo-alba, 

 purpurascente et ferrugineo-carneo tincta et maculata. 



Long. 31 poll., lat. If poll. 



Hab. St. Brandon Shoal, near Mauritius (thrown on shore after 

 a hurricane). 



Tbis very beautiful species is very closely allied to a shell in Mr. 

 Cuming's collection, which has been attributed by Mr. Sowerby, iu 

 his ' Conchological Illustrations,' to M. trigonulus, Lamarck. It 

 is also as closely allied to a shell in the collection of the King of 

 Denmark, which was figured for that species by myself in the * Con- 

 chologia Iconica.' From both, however, it is sufficiently distinct to 

 establish its claim to rank as a new species. 



6. Cyclostoma tubulum. Cycl. testa imperf or ata, turbinata ; 

 spira elevatiuscula ; anfractibus rotundatis, Icevibus ; apertura 

 circulari ; labro eleganter expanso ; lutescente-alba, nigricanti- 

 fusco multifasciata. 



Lat. l-i- poll. 



Hab. ? 



This very elegant species partakes of the characters of C. Belairi 

 and Boivini, but is quite distinct from either of those species. There 

 is no umbilicus and very little umbilical callosity. Tbe bands are 

 peculiar in extending over the expanded lip to the extreme edge. 



7. Cyclostoma EugenIjE. Cycl. testa subprofunde umbilicata, 

 subdepresso-orbiculari ; spira brevi ; anfractibus ad suturam 

 leviter impressis, deinde convexis, spiraliter dense elevato- 

 striatis, in medio acute tenuicarinatis ; apertura circulari, 

 labro (in hoc specimine) simplici ; fidvescente-spadicea, infra 

 castaneo plus minus tenue vittata. 



Lat. 1 poll. 



Hab. Mauritius (found in the heights of Flacq, at the roots of a 

 Bois-de-Natte tree). 



No. CCCXL.— Proceedings of the Zoological Society. 



