10 Dr. P. P. Carpenter on nsw Forms of Mollusca 



47. Odostomia tenuisculpta. 



O. testa ovoidea, subelevata, albida, tenui, diaphana ; anfr. nucl. 

 subverticaliter immersis, angustis ; norm, iii., parum tumidis, su- 

 turis impressis, sulculis spiralibus latioribus baud impress!?, dis- 

 tantibus, in spira iii., circa basirn rotundatam circ. vi. subobso- 

 letis ; apertura ovata ; plica acuta, declivi, parva, parieti contigua ; 

 labro acuto ; labio indistincto ; columella antice parum effusa. 

 Long. !, long. spir. '04, lat. '06, div. 60. 



Hob. Neeab Bay; one specimen (Swan). 



48. Scalaria Indianorum. 



S. testa gracili, turrita, alba ; anfr. circ. x., rotundatis, parum sepa- 

 ratis, leevibus ; basi simplici, baud uinbilicata ; costis viii.-xv. 

 (pleiumque xii.), acutioribus, subreflexis, interdum latis, plerumque 

 lineis irregularibus margini spirse recto parallelis ascendentibus, 

 rarius juxta suturam subnodosis ; apertura ovata. Long. 1*05, 

 long. spir. '8, lat. -36, div. 28. 



Hab. Neeah Bay (Swan). 



Strung as ornaments by tbe Indian cbildren. Intermediate 

 between S. communis and S. Turtonis, and scarcely differs from 

 " S. Georgettina, Kien.," Mus. Cum. no. 34, Brazil. 



486. Scalaria (t Indianorum, var.) tincta. 



S. llndianorum costis acutis, baud reflexis ; anfractibus postice fusco- 

 purpureo tinctis. 



Hab. Cerros Island (Ayres) ; S. Pedro (Cooper}. 



The Lower-Californian sbell may prove distinct. It is like 

 S. regularis, Cpr., but witbout the spiral sculpture. 



Submenus OPALIA, H. & A. Ad. (diagn. auct). 



Scalarice varicibus obtusis, irregularibus, parum defmitis : sculp- 

 tura basim versus interrupta. 



Ex. in Mus. Cum. : O. crassicostata, O. crassilabrum, 0. dia- 

 dema, O.funiculata, O.crenata, O.granuhsa, O.australis, O.bi- 

 carinala, O. attenuata, Pse., O. M { Andrea, Fbs., sp. ined. (W^st 

 Indies). Other West-coast species are 0. crenatoides and var. 

 insculpta, 0. spongiosa, and O. retiporosa. 



The species of this very natural group were arranged by Messrs. 

 Adams partly under Opalia and partly under Cirsotrema. 



49. Opalia borealis, Gld. 



0. testa 0. australi simillima, valde elongata ; anfr. xii., planatis, suturis 

 parum impressis ; testa jun. costis validissimis viii. latis, rotundatis, 

 peripheriam ftttingentibiiatenltim iuterfuptisj testa adulta stepius 



244 



