Class I. GASTEROPODA. 



Adult walking on an expanded foot. 



Subclass I. Gill comb-like, formed of one or two series of lamella; 

 under the mantle on the back of the neck, or rarely round its 

 edge. Adult and larva shell-bearing, larva furnished with deci- 

 duous cephalic fins. Unisexual, or hermaphrodite and self-im- 

 pregnating. Ctenobranchiata, Gray, 1840. Prosobranchiata, 

 M. Edw. 1846. 



Order I. Pectinibranchiata, Cuvier. 



Gill eomb-like, formed of one or (rarely of ) two longitudinal series 

 of laminae on tbe left side of the mantle over the back of the neck. 

 Animal unisexual. Shell spiral. 



Suborder I. Zoophaga. 

 Mantle produced into a siphon in front. 



Fam. 1. Strombidce. 



Teeth, central 1, lateral 3"3, uncinated. Muzzle produced. Eyes 

 pedicelled. Operculum small, claw-like, or wanting. 



* Tentacle on middle of eye-pedicel. Operculum claw-like. 



1. Strombus, Gray, Gen. Moll. n. l=Pvramea et Lambis, Mus. 



Berl. 1818. 



1 . S. gigas, Kiener, t. 80. f. 2 ; Forskael, t. 81 . f. 4 ; Lamk. t. 83. f. 1 . 



2. S. Pugilis, Bowdich, t. 81. f. 3. 



3. S, Auris-Dianse, Quoy, t. 2. f. 1. 



4. S. Canarium (var. Isabella), Quoy, t. 2. f. 4<?, 3$. ; Eydoux, 



t. SI a. f. 1. 



5. S. gibberulus, Quoy, t. 81. f. 1. 



6. S. Papilio, Quoy, t. 81. f. 2. 



7. S. lentiginosus, Quoy, t. 81. f. 5. 



8. S. variabilis, Quoy, t. 2. f. 2. 



9. S. Luhuanus, Quoy, t. 2. f. 6. 



10. S. plicatus, Quoy, t. 2. f. 5. 

 U.S. vittatus, Adams, t. 84 a. f. 5. 



2. Pterocera, n. 2. 



1 . P. truncata, Kiener, t. 79 ; Freycinet, t. 70. f. 5. 



2. P. Lambis, Quoy, t. 1. f. 2$, f. 1 ? . Teeth of sexes different 



according to Quoy, Ast. t. 49. f. 20 ? . t. 50. f. 8 $ . 



3. Fusus, n. 3. 



1. F. clavus. Rostellaria curvirostris, Kiener, t. 80. 



2. F. subulatus, Adams, MSS. t. 84 a. f. 6. 



** Tentacle none ? Operculum none. 



4. Seraphys, n. 4=Terebrina, Rafinesque. Oper. none. 



1. S. Terebellum (Terebellum subulatum), Adams, MSS. t. 84 a. f. 3, 

 t. 82. f. 3. 



