E. Rolan & F. Rubio 
A new Leucorhynchia from West Africa 
Discussion. Leucorhynchia gorii spec. nov. shows an 
apparent similarity with L. lirata , because of its 
rounded form, its small protoconch, the beginning of 
the spiral sculpture with cords with dépréssions, which 
later disappear. But L. lirata has a larger shell (up to 
3.5 mm, as opposed to 1.6 mm the new species may 
reach). The nurnber of whorls in the teleoconch of an 
adult L. lirata is about 3 !4, while L. gorii has no more 
than 2 l A whorls. The spiral whorls which form the 
sculpture of the teleoconch, after the First whorl, hâve 
smaller interspaces in L. lirata and wider in L. gorii. 
The most important différence between these two 
species is on the base where L. lirata has a very close 
umbilicus while that of L. gorii is wider showing the 
spiral cords on its inner part. The juvéniles of L . lirata 
hâve a wider umbilicus but are similar in size to L. 
gorii ; the aperture of L. lirata has quicker 
development and the umbilicus is bordered by very 
different elevated cords. 
Etymology. The new species is named after Sandro 
Gori who collected the sédiments where the shells 
were found. 
ACKNOWLEDGEMENTS 
To Jésus Méndez of the Centro de Apoyo Tecnolôgico 
a la Investi gaciôn (CACTI) of the University of Vigo, 
where the SEM photographs were made. Antonio A. 
Monteiro revised the English. 
REFERENCES 
Adam, W. & Knudsen, J., 1969. Quelques genres de 
mollusques prosobranches marins inconnus ou peu 
connus de l’Afrique occidentale. Bulletin Institut 
royal des Sciences naturelles de Belgique , 44(27): 
1-69. 
Rubio, F. & Rolan, E., 1991 “1990”. Aportaciones a 
los conocimientos sobre los micromoluscos de 
Âfrica Occidental. 2. Archaeogastropoda de Sâo 
Tomé y Principe. Iberus , 9(1-2): 209-219. 
Figures 1-7 
1-5. Leucorhynchia lirata Adam & Knudsen, 1969. 
1-2. Adult shell, 2.9 x 3.0 mm, Tinhosa Pequena, Principe I.; 3-5. Juvéniles, 1.9, 1.8 and 1.54 mm Tinhosa 
Pequena. 
6-7. Leucorhynchia gorii spec. nov. 
6. Paratype, 1.6 mm (MNCN 15.05/60001); 7. Holotype, 1.5 mm (MNHN 24633). 
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