196 TURBO. 



Linnaeus, to the almost sraootli form which represents the 

 T. niargaritaceus of the same autlior. After examining a 

 large number of specimens, I can find no consistent characters 

 by which to distinguish T. 'niargarltaceiis from T. argyro- 

 stomus. T. argenteus, Ch., and princeps and Lo.marcki of 

 Philippi, seem to me to belong to the same species, the 

 latter being a young shell. I cannot speak positively as to 

 these last, not having seen the types ; but from the figures and 

 descriptions they do not appear to present any specific dis- 

 tinguishing characters. — Hab. Eastern seas generally. 



17. ARTENSis, pi. i, f. 6, Montroiizier^ Journal de Con- 

 chyliologie, vol. viii. 370 ; Souverbie, J. de C, series 3, 

 vol. i. p. 274. — Testa ovato-ventricosa, imperforata, crassa, 

 viridis, brunneo-viridique plus minusve Iseto variegata ; 

 anfractus 6, rapide accrescentes, spiraliter costati (11 in ultimo 

 anfj'actu, 5 in coeteris), costula minima interjacente, oblique 

 et sublamellatim imbricato-striati ; apertura rotundata, intus 

 in fundo argentea, postea alba, distanter subsulcata; labro 

 viridi marginato, acuto, subcrenulato ; columella plano- 

 concava, interne dilatata, cum margine dextro angulum 

 subrectum formante. Alt. et lat. 55 mill. (Souverbie). Oper- 

 culum extus convexum, album, medio obsolete granulosum. — 

 A remarkable species, which there is no danger of confound- 

 ing with any other. The body-whorl is very large in pro- 

 portion to the spire, and the mouth large ; the spiral ribs are 

 very regular, narrow, and rounded, with an intermediate ridge 

 between each. — Hab. Art Island, Caledonian Archipelago. 



18. Lajonkairi, pi. ii. f. 7, Deshayes (Delphinula), Mag. 

 de Zool., 1839 — ducalis, Philippi. — -Testa ovata, umbilicata, 

 crassa, albida viriditincta, strigis ferrugineis raris ornata ; 

 anfr. 6 convexi, undulatim irregulariter costati, et lirati ; 

 anfr. ultimus medio biangulatus, ad utrumque angulum 

 squamis crassis albis tubulosis armatus ; apertura ovata, fauce 

 argentea ; peristoma simplex, margine subplicato ; columella 

 arcuata, argentea, cum peristomate juncta, ad basin effusa; 

 umbilicus costa valida elevata interdum squamigera vel 

 tuberculosa marginatus. — An easily recognised species ; in 

 some specimens the scales are so large and prominent as to 

 remind one of T. cornutus, from which species it is, how- 

 ever, notably different in general character. — Hab. New 

 Zealand (Deshayes), Keeling Island (Darwin). At present 

 not common. 



