172 



implicante induta ; umbonibus postmedianis, acutis ; cicatricibus sub- 

 elongatis ; linea pallii e margine remota, ; dentibus minimis, laterali- 

 bus utraque valva remotis, fere obsoletis ; valva? dextra? dente cardinali 

 unico ; v. sinistra dentibus duobus minimis margini contiguis. Long. 

 10; lat. 4 — ; alt. 7-f millim. Inhabits Sydney harbor. W. S. 



This beautiful species is easily known by its minute teeth, concen- 

 tric sculpture and abundant epidermis. Its shape is unusually un- 

 symmetrical. It not unlikely belongs to a genus not yet established. 



Lepton lucidum. T. parva, tenuis, nitida, alba, ovato-quadrata, 

 postice dilatata, concentrice striolata et obsolete radiata ; umbonibus 

 medianis acutis tumidis ; margine dorsali recta ; extremitatibus obliquis, 

 angulis ventralibus acutis rotundatis ; margine ventrali vix arcuata. 

 Long. 9 ; alt. 6 ; lat. 3 millim. Inhabits Hong Kong harbor. W. S. 



Kellia crenulata. T. tenuis, flavescens, trapezoidea, margini- 

 bus plerumque rotundatis ; margine ventrali recta et compressa ; 

 umbonibus fere medianis, prominentibus ; lineis incrementi conspicuis ; 

 tota pagina interiori rugulosa, cardinem versus marginibus crenulatis ; 

 dente cardinali conspicuo, conico, altero celato fossam ligamenti 

 metiente ; dente laterali singulo, curto, baud obvio. Long. 9.5 ; alt. 

 6.5 ; lat. 4 -f millim. Inhabits Hong Kong harbor. W. S. 



Readily known by its crenulated hinge margin. It has the aspect 

 of Scintilla, from which it differs in its teeth and ligament. Only 

 one valve was found. 



IgiT This and the five following species plainly belong to the family 

 Kelliada? ; but their precise generic place is less easily decided, and 

 indeed cannot be, without further knowledge of the animals. I have 

 placed them under the old genus Kellia, stating in what respects they 

 verge toward later genera. Mr. P. P. Carpenter has for the most 

 part worked out for me these minute bivalves. 



Kellia balaustina. T. miuuta, nitida, rotundato-ovata, rubigi- 

 nosa, subdiaphana, fineis concentricis creberrimis insculpta ; umboni- 

 bus submedianis, eminentibus ; margine ventrali valde arcuata : 

 marginibus cardinalibus rubidis ; valvse alterae dentibus card, duobus 

 parvis, dentibus lateralibus brevissimis, postico fere obsoleto ; valva? 

 altera? dentibus lateralibus curtis, antico obsoleto, dente cardinali 

 unico, valido. Long. 2.5 ; alt. 2 millim. Inhabits Sydney harbor. 



w. s. 



Three fresh specimens were obtained, resembling Astarte triangu- 

 laris. The lateral teeth are very short, and but from analogy might 

 be described as cardinal. 



Kellia bulla/ T. tenuissima, diaphana, ventricosa, elliptica, 

 postice truncata, Hneis incrementi vix conspicuis ; umbonibus parum 

 exstantibus ; valvae altera? dente cardinali debili, subelongato, torto ; 



