172 



implicante induta; umbonibus postmedianis, acutis ; cicatricibus sub- 

 elongatis; lixie§ pallii e margine remota; dentibus minimis, laterali- 

 bua utraque valvS remolds, fere obsoletis : valvae dextrae dente cardinali 

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

 10; lat. 4—: alt. 7+ niillim. Inhabits Sydney harbor. \Y. S. 



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

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

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



Lepton* lucidtjm. T. parva, tennis, 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 arcnata. 

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



Kellia CRENULATA. T. tennis, flavescens, trapezoidea, margini- 

 bus plerumque rotundatis; margine ventrali recti et compressa ; 

 umbonibus fere medianis. prominentibus ; lineis increment] conspicuis ; 

 tota pagin§ interiori rugulosa, cardinem versus marginibus crenulatis; 

 dente cardinali conspicuo, conico, altero celato fossam ligamenti 

 metiente ; dente lateral] singulo, curto, haud obvio. Long. 9.5 ; alt. 

 6.5; lat. 4 -f- niillim. Inhabits Hong Kohl; 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. 



\$^T This and the five following species plainly belong to the family 

 Kelliaihe: but their precise generic place is less easily decided, and 

 indeed cannot lie, 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. 



Ki i.i.i a balaustina. T. niinuta, nitida, rotundato-ovata, rubigi- 

 aosa, subdiaphana, lineis concentricis creberrimis insculpta ; umboni- 

 bus submedianis, eminentibus; margine ventrali valde arcnata: 

 marginibus cardinalibus rubidis ; valvae altera' dentibus card, duobus 

 parvis, dentibus lateralibus brevissimis, postico fere obsoleto; valvae 

 altera' dentibus lateralibus eurtis, antico obsoleto, dente cardinali 

 unico, valido. Long. 2.5; alt. 2 niillim. 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, lineis increment] vix conspicuis ; umbonibus parum 

 exstantibus; valvae alterae dente cardinali debili, subelongato, torto ; 



