67 



XXXI. Fusus. A subfusiform univalve, ventricose in its middle or 

 lower part, with a canaliculated base, arid no varicose sutures ; an elon- 

 gated 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, fasciolaria, and pleurotoma, with which La- 

 marck has formed separate genera. Murex long&vus, Brand, is very 

 properly disposed under this genus, by Lamarck, as Fusus longavus. 

 Mure.r deformis, Brand, is also brought here as Fusus clavellatus. Fusus 

 rugosus he considers as the same shell as Murex 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. Noa, 

 F. longavus, F. clavellatus, F. aciculatus, F. subulatus, F. hordeolus, F. zw- 

 tortus, F. polygonus, F. abbreviatus, F. excisus, F. minutus, F. asperulus, 

 F. plicatus, F. scalaroides, F. coronatus, F. alligatus, F. marginatus, F. no- 

 dulosus, F. angulatus, F. uniplicatus, F. funiculosus, F. heptagonus, F. sub- 

 carinaius, F.ficulneus, F. bulbiformis, F. terebralis, F. citharellus, F. lavi- 

 gatus, F. striatulatus, F. biplicatus, F. variabilis, and F. truncatulus. 



XXXII. Pyrula. A somewhat pyriform univalve, swelling in the 

 tipper part, with no variciform sutures, and having a caudated canali- 

 culated base and a short spire. The columella smooth, and the lip 

 not slit. 



P. l&vigata and clathrata, Lam. approximate to Bulla ficus, Linn. 

 P. subcarinata^ Lam. has much of the form of Valuta labrella, but has no 

 fold on the columella. P. nexilis, Lam. is Murex nexilis of Brander. 

 P. Itevigata, Lam. also agrees, I think, with No. 54, of Brander. 



Six species of this genus have been found fossil by Lamarck : P. l<svi- 

 gata, P. subcarinata, P. tricarmata, P. elegans, P. clathrata, and P. nexilis. 



XXXIII. Fasciolaria. A subfusiform univalve, channeled at its base, 

 without any projecting sutures, and having two or three very oblique 

 folds on the columella. 



This genus is represented by Murex tulipa, Linn. List. Conch. T. 910, 



