67 
M. calcitrapa, M.. crispus , M. frondosus, M. clathratus, M. cingulatus, M. 
striatulus, M. cancellinus, M. pyraster , M. textiliosus, M. colubrinus, M. 
Viper inus, JSI. nodular ins, M. reticulosus, and M. tubifei . 
XXXI. Fusus. A subfusiform univalve, ventricose in its middle or 
lower part, with a canaliculated base, and no varicose sutures ; an 
elongated spire, a smooth columella, and the lip not slit. 
This genus is formed by Lamarck of shells which were comprised 
in the genus Murex of Linnaeus, and in the genus Fusus of Bruguiere, 
who had also retained in it pyrula, fasciolar ia, and p/eurotoma, with 
which Lamarck has formed separate genera. Mureoc longcevus, Brand, 
is very properly disposed under this genus, by Lamarck, as Fusus 
longcevus. Mureoc deformis, Brand, is also brought here as Fusus 
clavellatus. Fusus rugosus he considers as the same shell as Mureoc 
porrectus, Brand. 
Lamarck has discovered, in the environs of Paris, thirty-three species 
of this genus which he has so much diminished : F. rugosus , F. Noce, 
F. longcevus, F. clavellatus , F. aciculatus, F. subulatus, F. hordeolus, F. 
intortus, F. polygonus , F. abbreviatus , F. excises, F. minutus , F. asperulus, 
F. plicatus, F. scalaroides, F. coronatus, F. alligatus , F. marginatus , F. 
nodulosus, F. angulatus, F. uniplicatus , F. funiculosus, F. heptagonus, F. 
subcarinatus, F. Jiculneus , F. bulbiformis , F. terebralis, F. citharellus, F. 
Icevigatus, F. striatulatus, F. biplicatus, F. variabilis, and F. truncatulus. 
XXXII. Pyrula. A somewhat pyriform univalve, swelling in the 
upper part, with no variciform sutures, and having a caudated 
canaliculated base and a short spire. The columella smooth, and the 
lip not slit. 
P. leevigata and clathrata, Lam. approximate to Bulla jicus, 
Linn. P. suhearinata , Lam. has much of the form of Voluta lahrella, 
but has no fold on the columella. P. neocilis, Lam. is Murex nexilis 
of Brander. P. leevigata, Lam. also agrees, I think, with No. 54, of 
Brander. 
Six species of this genus have been found fossil by Lamarck : 
