Reference List of South African Non-marine Mollusca. 229 
whorls, the last comprising practically the entire shell. Aperture 
long and narrow, furnished with one receding white rib half-way up 
the outer lip; a fold of medium size at the base of the columella ; 
and three sharp white parietal plaits at almost equal, but gradually 
decreasing distances between the columellar fold and the top of the 
aperture. Peristome acute, of paler colour. Columellar margin 
thickly reflexed, almost adnate. 
Shell 9°6 x 5:5; aperture 7:5; last whorl 8-8 mm. 
Type in British Museum. 
Hab. Navat. Durban Bay; mouths of Umlaas and Umkomaas 
Rivers (Burnup). 
A member of the group comprising M. granifer, Mouss., from 
Java; sulculosus, von Mts., from Amboina; corticinus, Morelet, from 
Mauritius; stratus, Pease, from Tahiti, and semisulcatus, Mouss., 
from Samoa, to the last two of which it must be very nearly allied. 
The half-furrowed appearance of the new species, though usual, is 
not always constant, some shells being covered all over with spiral 
grooving, in which state they much resemble striatus ; but owing to 
the widely divergent distribution, it is most improbable that the three 
species can be the same. 
482. MmLAMPUS UMLAASIANUS (Krauss). 
1844 Auricula umlaasiana, Krs., Kiist., Conch. Cab. p. 43. pl. 6 (1843), 
i MNS) ST, 
1856 Melampus wmlaasianus, Krs., Pfr., Mon. Auric. p. 34. D. 
1857 y = 5 Gat: Auric; p. 24... 2; 
Not Auwricula wmilassiana, ‘ Krs.,” Sow., Conch. Icon. pl. 6, f. 48. 
Type in Stuttgart Museum. 
Hab. Natau. Mouth of Umlaas River (Krauss). 
var. OBSCURUS, Kiister. [S.A.M. ] 
1844 Awricula umlaasiana, Krs., var. obscura, Kiist., Conch. Cab. 
po 44. pl, 6 (1843), f: 19205. DE. 
Hab. Narau. Mouth of Umlaas River (Krauss).  Isipingo 
(Burnup). 
Specimens from Isipingo, apparently referable to this variety, 
have of late years been erroneously attributed to M. castaneus, 
Mihlf. (=A. fusca, Phil.), a Sandwich Island species. MV. avellana, 
Morelet, from Mauritius, is also near akin, but it appears inadvisable 
to place either of the three in synonymy, 
