1 26 GASTEROPODA. PURPURADZ. 
It is to my friend, Charles Prideaux, Esq. that I am indebted 
for the knowledge of this highly interesting species, which he 
obtained from the deep water off the Plymouth Sound, and 
kindly transmitted to me for my collection. 
Genus 61. Buccinum. 
Buceium, Lamarck. 
Testa acuté elevato-spiralis, ad apicem mamillata. Siphon 
mediocris, recurvus, usque ad apicem peritremate tectus. Ten- 
tacula depressa, triangulata, mediocria, ad basin externé abrupté 
dilatata, oculigera. 
Synopsis Specierum. 
* Siphon obtusiusculus, ad apicem emarginatus. 
1. Puzxleianum. Anfractibus planiusculis, longitudinaliter et 
crebro subunduloso-striatis ; interstitiis transversim strio- - 
latis. 
2. undatum. Anfractibus veutricosis, longitudinaliter costatis 
et elevato-lineatis, ad dextram transversim undulato-cos- 
tatis. 
3. antiquum. Anfractibus ventricosis, longitudinaliter striatis; 
interstitiis transversim crenatis. 
** S2phon mediocris, integer. 
4. corneum. Anfractibus planiusculis, longitudinaliter elevato- 
lineatis ; interstitiis longitudinaliter striolatis. 
5. Bamffium. Anfractibus convexiusculis, transversim lamel- 
lato-costatis : costis numerosis. 
6. turricula. Anfractibus transversim costatis, longitudinali- 
ter elevato-lineatis, ad dextram abrupté planiusculis. 
Shell acutely elevated into a spire, the apex of which is ma- 
millated. Siphon moderately elongated, and recurved ; covered, 
even to its extremities, by the peritreme. Tentacula depressed, 
triangulated, moderately long, and abruptly dilated at their base 
externally, where the eyes are inserted. 
