Zoological Society. 449? 



r,^^^j„MoLLUscA. Gasteropoda. Siphonobranchea. 



"LAMiiDiTTM, Link, 1807, I. c. iii. p. 112. 



Spire little prominent ; aperture longitudinal, narrow ; inner lip 

 callous, with raised points ; outer lip marginated ; base truncated ; 

 shell destitute of varices or spines. 



Lambidium oniscus {S(rombiis), Linn. 



This genus having been indicated in 1798, by Dr. Bolten, as Mo- 

 rum, but without definition, the botanical signification of that name 

 may have induced Link to select another, which, being correctly 

 founded, must be preferred to Oniscia of Mr. Sowerby ; or at least, 

 if we should dissect the genus with Dr. Gray, into Oniscia, Sconsia, 

 and Morum, to the last. 



Phalium, Link, 1807, I. c. iii. p. 112. 



Spire shorter than the last whorl ; aperture longitudinal, wide ; 

 inner lip callous and smooth, or extended into a folded or granulated 

 lamina ; outer lip marginated ; shell often varicose ; base strongly 

 recurved, notched ; inner columella not folded. 



A. Lamina of the inner lip folded : Phalium glaucum (Buccinum), 

 Linn.&c. — B. Lamina of the inner lip granulated : Phalium erinaceum 

 {Bucc), Linn. &c. 



This is Bezoardica, Schum., or Cassidea, Swains. 



Cassidea, Link, 1807, I. c. iii. p. 111. 



Spire little prominent ; aperture longitudinal, narrow ; outer Up 

 marginated, like the inner one, with many folds ; shell spineless, often 

 varicose ; base strongly reflected, notched ; inner columella folded. 

 Cassidea rufa, tuberosa, cornuta, testiculus, Jlammea, pennata.^ 

 This has been proposed by Mr. Stutchbury as Cypnecassis, but 

 must at all events retain the name of Cassis, Browne, 1756. 



Galeodea, Link, 1807, I. c. iii. p. 113. 



Spire much shorter than the last tumid whorl ; inner lip extended 

 in shape of a smooth lamina ; outer one slightly marginated ; base 

 rather elongated, reflected, not emarginate. 



Galeodea echinophora (Bucc.), Linn. 



Synonyms are Mario, Montf., and Cassidaria, Lamck., both of a 

 more recent date. 



Thais, Link, 1807, I. c. iii. p. 114. 



[Thais of Bolten Mus. includes some Ricinulce and Monoceros of 

 Lamarck, from which Link has depurated it.] 



Spire shorter than the last, ventricose whorl; aperture semicircular; 

 inner lip plane, obliquely cut oif, callous, smooth ; outer lip scarcely 

 marginated ; shell without varices ; base short. 



Thais Persica (Bucc), Linn. — patula, Linn. sp. — hcemastoma 

 (Chemn. fig. 964, 965). — -fiicus, Gmel. sp. — minuta. Link. 



This genus, which is synonymous with Microtoma, Swainson, I 

 should think advisable to be retained at least as a section of the 

 hitherto confused genus Purpura. 



Ann. ^ Maff. N. Hisl. Ser. 2. Vol. xii. 31 



