BUCCINID. 135 
isa member of the genus Ficula, Swainson, over which it has 
priority, and instead of which it should therefore be adopted. 
Cassidulus, Humphrey, has priority over Melongena, but I 
cannot adopt it as it isa mere catalogue name. 
BULBIFUSUS, Conrad. Not characterized. MW. inauratus, Conr. 
(= Fusus Fittonii, Lea) (li, 49). Eocene; Claiborne, Ala. 
CORNULINA, Conr. Not characterized. M. armigera, Conr. 
(= Fusus Taitii, Lea) (li, 48). Eocene. 
LEIOSTOMA, Swains, 1840. (Sycum, Bayle, 1880.) Fusiform, 
ventricose in the middle, entirely smooth, almost polished ; inner 
lip thickened and vitreous; base of the pillar very straight. I. 
bulbiformis, Lam. (li, 49). Grignon. 
A comparison of numerous specimens indicates the very close 
relationship of Bulbifusus, Conr., with this group. Bayle has 
changed the name to Sycum, because Leiostoma is preoccupied 
by Lacepéde in Fishes. I cannot concur in such changes, which 
would completely unsettle our nomenclature. 
Hemirusus, Swainson, 1840. 
Syn.—Cochlidium, Gray. 
Distr.—6 sp. W. Coast Africa, West Indies, Peru, Philip- 
pines, Australia, Indian Ocean. 
Shell subfusiform, uncolored or light yellowish ; spire shorter 
than the aperture, ponderous; whorls armed with compressed 
spines upon the shoulder; aperture long ovate, with an ascending 
internal canal at the hind-part, produced into a moderate wide 
canal anteriorly ; columella smooth; outer lip simple. Oper- 
culum unknown. 
Besides being thinner, the shells of this genus are distin- 
guished from Melongena, by being white (without bands or 
other color-markings) under a light yellowish brown epidermis. 
They differ from Fusus in the flexuous, wider, open canal, which 
is widened gradually into the lower portion of the aperture. 
THATCHERIA, Angas. Shell angularly pyriform, solid; spire 
prominent, shorter than the aperture, many-whorled, whorls 
flattened above, strongly keeled at the periphery and contracted 
below; aperture with a broad incurved sinus between the 
extremity of the last keel and the junction of the body-whorl ; 
basal canal wide and open; columella smooth; outer lip simple 
below the sinus. 7. mirabilis, Angas (xlix, 5). 
That this shell is a scalariform monstrosity cannot be doubted, 
but what may be its normal form is not so readily ascertained. 
I saw the single specimen from which the above generic descrip- 
tion was made, in London, in 1877, and was immediately con- 
_ vinced that the conical form, flattened shoulders and sinus were 
all due to distorted growth. 
