— 303 — 
Diagnose du nouveau genre méditerranéen &y-= 
riscus , 
PAR N. TIRERI. 
GENUS Gyriscus, Tiberi, 1867. 
T. turbinata, conico-turrita, umbilicata ; apex obtusus, 
vertice involuto; anfr. rotundati, transverse cingulati ; 
apert. subcirculuris, marginibus acutis, callo juncths, 
columellari reflexo.— Operculum corneum, superne mul- 
üispiratum, inferne processu styliformi præditum. 
GYRISCUS JEFFREYSIANUS, n. Sp. 
Cochlea turbinata, elato-conica, turrita, modice umbili- 
cata, luteo-fulvescens; apex obtusiusculus, lævigatus, ver- 
tice intorto, subperforato, spiraliter involuto; anfr. T con- 
veæi, sulturaprofunda divisi, transverse cingulati, cinquls 
confertis, alternatim majoribus (num. fere 15 totidemque 
minoribus in ultimo anfractu; num. 6 in penultimo), ele- 
ganter granulosis, submoniliformibus ; anfr. ultimus ro- 
tundatus, subinflatus, basi paululum depressus; umbilicus 
mediocris, pervius, superne circulariter crenulatus ; 
apert. subcircularis, effusa, intus haud margaritacea, mar- 
ginibus acutis, callo parietali junctis; margine columellari 
sinualo, reflexæo, umbilici partem occulltante. — Diam. 
maj. 9, min. 8, alt. 10 1/2 maill. — Operculum corneum, 
superne nucleo centrali depresso lamellaque erecto-crenu- 
lata multispiratum, inferne processu centrali styliformi 
paucispirato præditum, limbo peripherico incrassatum.— 
Animal hucusque incognitum. 
Hab. In fundis coralligenis maris Sardiniam meridio- 
nalem ambientis. Ne 
