173 



dente Literati curto parum elevato ; valvas alterae — ? Long. 8 -f ; lat. 

 C ; alt. 6 + millim. Inhabits Loo Choo. W. S. 



Distinguished by the swollen, slightly prominent umbos ; teeth short 

 and delicate. 



Kellia undulata. T. minuta, tenuis, ovato-quadrata, tumida, 

 concentrice undulato-striata, flavido-rosaceo tincta ; umbonibus vix 

 ante-medianis, elevatis ; extremitate anticu. acute rotundata ; extrem. 

 postiea latiori, subtruncata ; margine ventrali lente arcuata, dimidio 

 postico cavositatis vivide miuiato. Long. 2 ; lat. et alt. 1.5 millim. 

 Inhabits Kagosima. W. S. 



Kellia compacta. T. equilateralis, subquadrata, epidermide 

 extra marginem product;! bene induta, striis concentricis lamellosis 

 ornata ; umbonibus haud eminentibus ; marginibus dorsalibus rectis, 

 declivibus ; marg. ventrali recta : extremitatibus rotundatis ; cicatrici- 

 bus ovalibus ; tinea pallii simplici ; valvula? altera? dentibus duobus 

 magnis, divergentibus, equalibus ; altera? marginibus dentibus simulan- 

 tibus, elongatis ; fossa ligamentati ampla. Long. 6 -|- ; lat. 3 -|- ; alt. 5 

 millim. Inhabits ? 



Resembles in form Bornia corbuloides Phil. The prolonged infolded 

 epidermis brings it in alliance with Lepton ; but its hinge is like that 

 of Pythina Hinds. A knowledge of the animal can alone remove it 

 definitively from the old genus Kellia. 



Kellia coxvexa. T. parva, trigono-elliptica, plus minusve in- 

 flata, facie variabilis, striis concentricis confertis notata et epidermide 

 rugosa inflecta induta ; umbonibus fere medianis, tumentibus, plus 

 minusve prominentibus ; margine ventrali recta vel incurvata ; ex- 

 tremitatibus rotundatis ; cicatricibus inconspicuis ; ligamento interno 

 ossicula firmato. Long. 4 -j- ; lat. 1 ; alt. 3 -j- miltirn. Inhabits 

 Simon's Bay, in sand, 12 fathoms. W. S. 



The hinge is as in K. compacta, but the ossicle at the hinge seems 

 to bring it under Montacuta. In young specimens there is a punctate 

 appearance by transmitted light. Its true place must be decided by 

 the animal. It is very variable in outline. 



Moxtacuta DiVARiCATA. T. minuta, tenuis, albida, oblique 

 ovato-trigonalis, cuneata, convexiuscula, liris tenuibus interdum bifur- 

 catis radiata; umbonibus acutis terminalibus ; extrem. postica late 

 truncata ; portione antica semiovali, acute rotundata. Ossiculum antice 

 quadratum, postice triangulare truncatum. Inhabits Hakodadi, on the 

 spines of a Spatangus. W. S. 



This interesting little species is readily distinguished by its very 

 oblique, cuneate form, and radiated surface. 



Cryptodon subradiatus. T rotundato-elliptiea, planata, mar- 

 ginibus rotundatis ; umbonibus angustis prominentibus, medianis ; 



