18/3.J MR. G. B. SOWERBY ON NEW SHELLS. 719 



supra peri pheriam lirato-striatis ; umbilico valide lirato; aper- 

 tura oblique circulari, intus atro-fusca, labro reflexo. 

 Hab. Madagascar. 



A depressedly turbinated shell, widely umbilicated, grevish white, 

 spirally banded with purplish brown, transversely streaked with pale 

 yellow ; spire rather acute ; whorls rounded, concentrically finely 

 striated, and above the periphery spirally ridged, strongly corded in 

 the umbilicus ; aperture rather oblique, interior dark brown ; lip 

 reflected. 



4. Typhis expansus, sp. nov. (Plate LIX. fig. 4.) 



T. testa subfusiformi, albida, pallide fusco tincta ; spira bre- 

 viuscula, acuminato-turrita ; anfractibus transversim obscure 

 Hratis, superne angulatis, supra angulum concavis, quadrivari- 

 cosis ; varicibus tenuibus, ad angulum falcatis, varice ultimo 

 late expanso reflexo ; tubis inter varices brevibus, ultima elon- 

 gata ; canali breciusculo ; apertura ovali. 



Bab. ? From the collection of the late Thomas Norris, Esq. 



A whitish shell, tinged with pale brown ; spire rather short, acu- 

 minately turreted ; whorls transversely obscurely ridged, angulated 

 at the upper part, concave above the angle, with four varices hooked 

 at the angle, the last varix being broadly expanded and reflected ; 

 the tubes between the varices are short, with the exception of the 

 last, which is prominent ; the canal is rather short. 



The expansion of the last varix gives this shell its broad appear- 

 ance. 



5. Eutrochus alternatus, sp. nov. (Plate LIX. fig. 5.) 



E. testa subacute conica, solidiuscula, rosaceo albida, fusco-macu- 

 lata et flammuluta ; anfractibus pi uno-declivibus, undique dense 

 spiraliter granoso-liratis, /iris alternatis, granis parvis ; basi 

 planata, regulariter granoso-lirata, incise umbilicata ; umbilico 

 piano, albo. 



Hab. Australia? 



A rather acutely conical shell, pale rose-colour, flamed and spotted 

 with brown ; whorls flatly sloping, throughout closely spirally grain- 

 ridged, ridges alternately smaller, grains small ; base flat, regularly 

 grain -ridged, with a deeply cut umbilicus, which is smooth and 

 white. 



Obs. Species of the genus Eutrochus, A. Adams, have been in- 

 cluded in the group of Trochidse, distinguished under the title of 

 " Ziziphinus,"" from which they are separated principally on account 

 of being umbilicated. To this genus or group belong the followiiiw 

 species, which have been described under the generic names of 

 Trochus, Ziziphinus, and Eutrochus, viz. : — -jujubinus, Gmelin ; pul- 

 chellus, Phil.; gemmosus, Reeve; zonamestus, Adams; ticaonicus, 

 Adams ; perspecfivus, Adams ; scitulus, Adams. All these come 

 from Australia and the Eastern archipelago. Of the new species 

 above described I have only seen one specimen, and have no certain 

 knowledge of its locality ; but it will probably prove an Australian 



