Dr. E. von Martens on new Species of Sheik. 431 



striata, opaca, albida, prope vertices subfasciata et facie interna 

 media ochracea ; antice rotundata, postice subrostrata, margine 

 ventrali postice ascendente ; flexura distincta ; ligamentum super- 

 ficiale, dimidium marginis dorsalis postici occupans ; dens cardinalis 

 valvae sinistree unicus crassiusculus, valvae dextrae duo, posterior 

 bifidus; margo cardinalis incrassatus ; sinus palliaris magnus, per 

 totam longitudinem cum linea palliari concretus, in valva sinistra 

 musculum anticum attingens, in dextra ab eo sat remotus. 

 Long. 33, alt. 27, crass. 15 mill. ; vertices ad \^ longitudinis. 



Yokohama, Japan. 



Similar to T. frigida, Hani. ; but the posterior part shorter, 

 more sloping, and distinctly bent to one side. 



9. Tellina iridella. 



T. testa transversim oblonga, sat compressa, insequilatera, tenui, con- 

 centrice striata, nitida, rosco-albida, iridescente ; antice rotundata, 

 postice breviore, subrostrata, margine ventrali subrecto, dorsali 

 postico valde declivi ; flexura parum distincta ; dentes cardinales 

 in utraque valva bini, parvi, in valva dextra subsequales, in sinistra 

 anterior major ; sinus palliaris magnus, musculo antico appropin- 

 quatus, per totam longitudinem linese palliari adnatus. 



Long. 19, alt. 10, crass. 4^ mill. ; vertices in \^ longitudinis. 



Japan. 



10. Gastrana Japunica. 



G. testa transversim pyriformi-ovata, ventricosa, valde insequilatera, 

 concentrice striata et striis radiantibus elevatis obtusis superfi- 

 cialibus confertis decussata, albida, unicolori, antice breviore, ro- 

 tundata, postice producta, subperpendiculariter truncata, carinula 

 nulla, margine ventrali medio recte utrinque ascendente. Dens 

 cardinalis valvse sinistrae anterior porrectus, triangularis, leviter 

 bifidus, posterior parvus, postice sensim in marginem cardinalem 

 abiens ; sinus palliaris ascendens, rotundatus, major parte a linea 

 palliari solutus, dimidiam longitudinem testae attingens. 



Long. 33, alt. 23|, crass. 17 mill. ; vertices in -^ longitudinis. 



Yokohama, Japan. 



11. Psammobia {Psammotcea) connectens. 



P. testa ovato-oblonga, subaequilatera, postice paulo elatiore, utrinque 

 rotundata, leviter concentrice striata, violacca, epidermide intense 

 violaceo-fusca, nitida vestita ; margo ventralis rectus ; dens cardi- 

 nalis valvae dextrae unicus, compressus, valvae sinistrae duo, mi- 

 nores, anterior compressus, posterior depressus, nymphis accli- 

 natus ; sinus palliaris primum transversus, dein oblique descendens, 

 lineae palliari totus fere adnatus. 



Long. 28, alt. 15|, crass. 8i mill. ; vertices in f longitudinis. 



Banka Island, east of Sumatra. 



