4 Dr. P. P. Caq>enter on new Furins of Mul/usks 



'lincronalitcr panim prodiiota ; mnririulbus sub(|iif»(lrai)i:iilat?m ro- 

 tuiidatis ; iinil)oiiil)its iirorniiientiiiiis, valile niitice intiirtis ; tuta 

 euperfifie iit in C. dfcusxatn seiilpta, e >stulis tTel)ris radiantibus 

 spqiiidistaritibns, hie et illic aliis iiitercalati* ; linilis coiicin- 

 tricis decussaiitiljus : intus niar;j;ine dorsali Itrevissimo, arciiato, 

 df ntato ; li<;amento curtissimo, in fossa omnino interna, cclata, la- 

 mina detiniente, sito ; lamina cardinali sub uinbonibus intus por- 

 recta, dentibus validis instriu-ta ; marjiinibus intends omnino cre- 

 natis ; cicatr. addiict. snbt3equalibus, ventraliter sitis. Long. "1, 

 !at. -IL', alt. 0!) poll. 



Located provisionally in Crendla from its likeness to C. de- 

 eussnia, but with peeuliarities of hinge and adductors which 

 approach Nuculma on one side and Cardilia on another. 



Genns Bryophila*. 



Anim.il ,\vicnlidrpnm, vivijiarum : inter algas, etc., babitans. 

 Tc'stu Pinnsei'ormis, extns pri.sniatira, intus sul)nacrea : liganientura 

 Bolumm : umbunes e.\tante$, terminales, intus concavi. 



10. Bryophila sctosa. 



J), testa parva, regulari ; cinerea, salmoneo sen chocolateo, intus sub- 

 liacreo, exquisite tincta : t. juniore planata, semirotnndata, dor- 

 saliter recta, requilaterali, oonspicue punctata : t. adolesciiite sub- 

 diaphana: t. adulta solidiore ; umbonibus rectis, terniinalibus, 

 intus alte excavatis ; niarg. dorsali breviore, recto ; antico recto ; 

 ventrali et postico late rotundatis : extus ej)idermide subspongiosa 

 v?stita, radiis setarum subdistantibus, marginibus eleganter pecfi- 

 natis : intus ligamento solido dorsaliter producto ; limbo pallii 

 eequaliter prope marginem decurrente ; ci. atr. adduct. submediana, 

 inconspicua ; postice hiante ; antice propter byssum tenuera si- 

 nuata. Long. '13, lat. '2, alt. '1 poll. 



Like a minute Pinna, or a transverse Margaritiphora without 

 ears, or an Isognumon without pits. Differs from the other 

 Aviculids in being viviparous, like some other minute bivalves. 



11. ?Atys casta. 



lA. testa elongata, tenui, subdiaphana, albida; antrorsum paulum 

 tumidiore ; spira celata, lacuuata, (t. adultse) baud umbdicata ; 

 columella paulum intorta, effusa ; umbilico antico minimo ; labro 

 postice producto, obtuse angulato ; tota superficie subtiiiter spira- 

 liter striatula. Long. '4, lat. '18 poll. 



On the confines of the genus, related to Cylichna. 



12. Ischnochiton parallelus. 



I. testa ovata, subelevata (ad angulum I'JO'^); rufo-fusca, oHvaceo 

 tiucta ; valvis latis, marginibus parum rotundatis, interstitiis par- 



'>^:t^i. ; •■: ai,;i • B^voi», sea-moss ; i^iXor, loving, ' " -"' 



212 



