Zoological Society. 440 



MoLLUscA. Gasteropoda. Siphonobranchea. 



Lambidium, 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 (^Strombus), Linn. 



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

 )'um, 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 Monem, to the last. 



Phalium, Link, 1807, /. e. 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 glauciim (Buccinum), 

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

 {Biicc), Linn. &c. 



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



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



Spire little prominent ; aperture longitudinal, narrow ; outer lip 

 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 Cijprcecassis, but 

 must at all events retain the name of Cassis, Browne, 1 756. 



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 ofi", callous, smooth ; outer lip scarcely 

 marginated ; shell without varices ; base short. 



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

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



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

 should think ad\-isable to be retained at least as a section of the 

 hitherto confused genus Purpura. 



Ann. i^ Mag. N. Hist. Ser.2. Fo/. xii. 31 



