10 Dr. P. r. Carpcnt; r on new Forms of MuUusca 



47- O.iostomia tenuisailpta. 



O. testa ovnidea, subelevata, albiila, tenui, diaphana ; aiifr. nucl. 

 subvcrticaliter inimers-is, angustis ; norm, iii., parmii tuinidis, su- 

 tiiris impressis, sulculis spiralibus bitioribus baud impres.'^i-^, dis- 

 tantibu*, in spira iii., circa" basim rotundatain circ. vi. subobso- 

 letis ; apertura ovata ; ])Uca acuta, decUvi, parva, paricti contigua; 

 labro acuto ; labio iinUstiucto ; cobunella autice jjuruin eft'usa. 

 Long, "l, long. spir. "0-1, lat. OG, div. (JU°. 



Hub. Nceah Bay; one specimen {Swan). 



48. Scalaria Indianonim, 



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

 ratis, liEvibus ; basi siniplici, baud unibilicata ; custis viii.-xv. 

 (pleiunique xii.), acutioribus, subn-flexis, intcrdum latis, pk-rumcjue 

 lineis irregidaribus tnargini spirse recto parallelis ascendeutibus, 

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

 long. spir. -8, lat. "3(5, div. 28^. 



Hub. Necah Bay [Swan). 



Strung as ornaments by the Indian children. Intermediate 

 between /S. coininunis and S. Turtunis. and scarcely differs from 

 " S. Geuryettina, Kieu.," Mus. Cu lO. 34, Brazil. 



48 6. Scalaria {? Indianonnn, var.) tincta. 



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

 purj)ureo tinctis. 



Hab. Cerros Island [Ayres) ; S. Pedro {Cooper). 



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

 S. regularis, Cpr., but without the spiral sculpture. 



Subgenus Opalia, H. & A. Ad. (diagn. auct.). 



Sralaricf varicibns obtui*is, irrcgularibus, parum definitis : sculp- 

 tura basim versus interraj)ta. 



Ex. in ]Mus. Cum. : — O. crassicostafa, 0. crassilabrum, 0. dia- 

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

 carinala, O. attenuata, Pse., O. M' Andrew, Fbs., s]). ined. (West 

 Indies). Other West-coast species are O, crenaioides and var. 

 insculpta, O. spongiosa, and O. retiporopa. 



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

 Adams partly under Opalia and partly under Cirsotrema. 



49. Opalia borealis, Gld. 



O. testa 0.fl««//"o^/simillima,valdeelongata; anfr. xii., planatis, suturig 

 parum imj)ressis ; testa jnn. costis vnl'dissimis viii. lalis, rotundatis, 

 peripheriam attin^eutibus,inteiJum uittrruptisi testa adulta seepius 



244 



