158 



MoDiOLA ALBicosTATA. Var. l,poUta. Var. 2, nebulosa. Two 

 varieties of this most variable shell have been forwarded to 

 me, one from Diana Basin, near George's Bay (Aug. Simson), 

 a small deep black or olive tumid shell, very highly polished 

 and seldom divested of the epidermis. Hinge margin very 

 acute, straight and angular. Long. 11, lat. 24, which size it 

 preserves very constantly, and is found in great numbers. 

 2, var. nebulosa. A larger, more tumid, less polished shell, 

 paler or clouded chestnut and deep brown, often distorted ; 

 hinge margin less acute and less angular, ventral margin, 

 sinuous. Long. 13, lat. 30. Isthmus Bay, Eev. H. D. Atkin- 

 son. Abundant at low water attached to weed. 



No. 79. DiPLODONTA TASMAXiCA. 71. s. D.t. orbiculari, subglohosa, tenui, 

 alba, subpellucida, epidennide fusca plus minusve induta ; concentrice striata, 

 Striis incrementi tantuni sed 2-3 latioribus insignita, natibus Icevibus, acutis, 

 ligamento conspicuo, viargine dorsali acuta. Long. 17, lat. 18. 



Shell orbicular, subglobose, thin, white subpellucid, more or 

 less covered with a fuscous epidermis ; concentrically striate 

 with lines of growth only,but distinguished by 2-3 much broader 

 lines ; umbones smooth, acute ; ligament conspicuous, dorsal 

 margin acute. Storm Bay, and Blackman's Bay, not uncom- 

 mon. W. F. Petterd, W. Legrand, Eev. H. D. Atkinson. 



No. 80. Semele warburtoni. n.s. S.t. orbiculari, sub-inflata, crassiuS' 

 cula,radiatim tenuiter costata, costis numerosis, depressis, irregularibus, antice 

 latioribus ; concentrice creberrime lamellata, lamellis, minutis, regularibua, 

 crassiuscidis, retrorsim curvatis ; lineis incrementi 3-4, conspicuis ; natibus 

 parum exsertis ; alba, margine dorsale, cleganter rosea tincta ; intus polita 

 nivea. Long. 30, lat. 34, alt. 12. 



Shell orbicular, sub-inflated, rather thick, radiately finely 

 ribbed, ribs numerous, depressed, irregular, broader anteriorly ; 

 concentrically thickly lamellated, lamellse minute, regular, 

 somewhat thick, curved backwards ; lines of growth 3-4, con- 

 spicuous ; umbones slightly exsert, shell white, dorsal margin 

 elegantly rose tinted, polished and snowy white inside. West 

 Coast. W. F. Petterd. 



No. 81. Gouldia tasmanica. n.s. G.t. parra, transversa, acute trigona, 

 alba, compressa, concentrice lirata, liris devatis, rotundatis, aliquando in 

 medio attenuatis et desinentihus ; interstitiis tenuissime reticulatis, umbonibus 

 acutis, inarginibus rotundatis. Long. 2^, lat. 3. 



Shell very small, transverse, acutely trigonal, white, com- 

 pressed, concentrically ridged, ridges raised, rounded, some- 

 times becoming attenuate and ceasing in the middle, 

 interstices very finely reticulate ; umbones acute, margins 

 rounded. Long Bay, Eev. H. D. Atkinson, 



No. 82. Kkllia ATKiNSOXi. n.s. K.t. pari-a, long, oblcnja, oblique ti-iffonat 

 tumida, nitente, translucida, pallide carnea, Iccvi, obsolete late sulcata ; mar- 

 ginibus, rotundatis crenulatis. Long. 3, lat. 2. 



Shell very small, longitudinally oblong, obliquely trigonal, 



