from the Vancouver District. 31 



48. Scalaria Indianorum. 



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

 ratis, Isevibus ; basi simplici, haud umbilicata ; costis viii.-xv. 

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

 lineis irregularibus margiai 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 the Indian children. Intermediate 

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

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



48 b. Scalaria (? Indianorum, var.) tincta. 



S. 1 1ndianorum costis acutis, haud reflexis ; anfractibus postice fusco- 

 purpureo 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.). 



Scalarice varicibus obtusis, irregularibus, parum defmitis : sculp- 

 tura basim versus interrupta. 



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

 dema, 0. funiculata, O. crenata, 0. granulosa, O. australis, O. bi- 

 carinata, O. attenuata, Pse., 0. M l Andrea, Fbs., sp. ined. (West 

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

 insculpta, O. 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. 



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

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

 peripheriam attingentibus, interdum interruptis; testa adulta ssepius 

 obsoletis, ad peripheriam evanidis ; circa basim totam usque ad 

 peripheriam angulatam lamina spirali, planata ; apertura ovali ; 

 tota superficie minutissime spiral iter striolata : operculo pauci- 

 spirali, nucleo ad trientem longitudinis sito, lineis incrementi va- 

 lidis. Long. 17, long. spir. 1-3, lat. -53, div. 20°. 



Hab. Puget Sound (U. S. Expl. Exp.); Neeah Bay and Ta- 

 tooche Island (Swan). 



This species was doubtfully indicated, not described, by Dr. 

 Gould, in the ' E. E. Moll/ p. 207. It appears to be exactly iden- 



