10 Dr. P. P. Cai-pciitor on mw Forms of MoIIasca 



47. Odostomia tenuisculpta. 



0. tesia ovoidea, subelevata, albida, tenui, diaphana ; anfr. nucl. 

 subverticalitei' immersis, angustis ; norm, iii., parum tuinidis, su- 

 turis impressis, sulculis spiralibus latioribus baud impressis, 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. "1, long. spir. '04, lat. '06, div. G0°. 



Hab. Neeali Bay; one specimen {Swan). 



48. Scalaria Indianorum, 



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

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

 (pleiuinque xii.),acutioribus, subreflexis, interdum latis, pleruuique 

 lineis irregularibus margini spirse recto parallelis ascendeiitibus, 

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

 long. spir. -8, lat. -30, div. 28°. 



Hab. Neeah Bay {Swan), 



Strung as ornaments by the Indian children. Intermediate 

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

 '* (b\ Georgettina, Kieu.," Mas. Cum. no. 34^ Brazil. 



48 6. Scalaria {^.Indianorum, var.) tincta. 



S. Ilndianorum costis acutis, hand 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.). 



Scahn'iee varicibus obtusis, irregularibus, parum definitis : sculp- 

 tura basim versus interrupta. 



Ex. in Mus. Cum. : — O. a^assicosfata, 0. crassilabrum, 0. dia- 

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

 carinata, O. atteiiuata, Pse., O. M'Andrece, Fbs., sp. ined. (West 

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

 insculpta, O. spongiosa, and 0. 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 0. australi simillima, valde elongata ; anfr. xii., planatis, suturis 

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

 peripheriam attingentibus; inter Juin uiterruptis; testa adulta saepiua 



244 



